Principles of Cancer Biotherapy

Principles of Cancer Biotherapy 5th Edition

Principles of Cancer Biotherapy 5th Edition

Edited by Robert K. Oldham Hematology-Oncology Associates of Southeast Missouri Hospital Southeast Medical Plaza Cape Girardeau, MO USA

Robert O. Dillman Hoag Cancer Center Newport Beach, CA USA University of California Irvine, CA USA

Robert K. Oldham Hematology-Oncology Associates of Southeast Missouri Hospital Southeast Medical Plaza Cape Girardeau, MO USA

Robert O. Dillman Hoag Cancer Center Newport Beach, CA USA University of California Irvine, CA USA

e-ISBN 978-90-481-2289-9 ISBN 978-90-481-2277-6 DOI 10.1007/978-90-481-229-9 Springer Dordrecht Heidelberg London New York Library of Congress Control Number: 2009929387 First edition published 1987 by Raven Press Second edition published 1993 by Williams & Wilkins Third and Fourth edition published 1998 Kluwer Academic Publishers © Springer Science+Business Media B.V. 2009 No part of this work may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, microfilming, recording or otherwise, without written permission from the Publisher, with the exception of any material supplied specifically for the purpose of being entered and executed on a computer system, for exclusive use by the purchaser of the work. Printed on acid-free paper Springer is part of Springer Science+Business Media (www.springer.com)

Preface

The idea for the first edition of Principles of Cancer Biotherapy was formulated in the early 1980s. As the founding director of the Biological Response Modifiers Program for the National Cancer Institute from 19801984, one of us (rko) envisioned a textbook that would embody the principles of the then fledgling fourth modality of cancer treatment - biotherapy. Contributing authors were solicited in 1985, and the first edition came off the presses in 1987. Principles represented the first comprehensive textbook on the use of cancer biotherapy and summarized the work done in this field through 1986. The second edition of Principles was published in 1991 about the time biotherapy was more broadly recognized as the fourth major cancer treatment modality. Subsequent textbooks by DeVita, Hellman and Rosenberg [1] in 1991, Mitchell [2] in 1993 and Rosenberg [3] in 2000 validated the importance of this modality in cancer care. This third edition was published in 1998 and confirmed the tremendous progress that had been made in the previous five years using biologicals in cancer treatment. It was generally agreed that biopharmaceuticals were producing major opportunities for new cancer therapies. Cancer biotherapy was emerging as a more specific and targeted form of systemic cancer treatment. Cancer growth control was also becoming an effective method of treatment complementing cancer destruction as mechanisms of cancer treatment and “cure”. The fourth edition of Principles was published in 2003. It was apparent that biotherapy and the use of biopharmaceuticals had not only become recognized as the fourth modality of cancer treatment, it was clear that biopharmaceuticals had become the dominant form of new cancer therapeutics which in the future will replace less selective, more toxic forms of therapy. For years, the chemical manipulation of small molecules has been pursued in drug development. We now have all the tools for the biological manipulation of natural substances for therapeutic use. In fact, as we better understand the interaction between biological molecules and their receptors, it is clear that biological manipulation and chemical manipulation are coming together to bring molecular medicine to the bedside. Many biological molecules are large and have functions other than

those mediated by their active sites. There is increasing evidence that drug development will focus on the interaction between the smaller active regions of these large biological molecules and their receptors. This opens up a broad field of molecular design for extending and improving the therapeutic activities of natural biological molecules. This has recently been extended to small molecules interacting with DNA/RNA (anti-sense), with enzymes such as tyrosine kinase and with growth and vascular factor receptors. The last decade has been extraordinarily productive in the development of new anticancer drugs through chemical and biological manipulation of these natural molecules. Thus, the body itself has become the “medicine cabinet” of the future. In the 1990s and beyond into this millennium, medicine will face extraordinary demands. While technology brings us tremendous opportunity, it also highlights problems in our medical care system. Most new technology is expensive and, as it comes from the laboratory to the clinic, is by its very nature untried and unproven. Our medical care system involves a private and government insurance reimbursement system that favors paying for marginally effective medical care of the past rather than innovative medical treatments of the future. Such a system is inhibitory to the development of effective new anti-cancer medicines. To more rapidly and efficiently exploit the opportunities in cancer biotherapy in the future, patients, employers, insurers, universities, and government must come together and redefine the system of reimbursement to maximize the patient’s opportunity for access to new and potentially effective cancer therapies. To simply reimburse for old ineffective or marginally effective treatment is not the answer. Provisions must be made to fund clinical research and afford these new approaches broader use at the bedside. We must develop methods to allow our patients access to the opportunities of the future, while maintaining solid support for effective therapies of the past. No longer is it acceptable to pay only for medical care that utilizes old technology, such as chemotherapy, that is approved but only marginally effective. Across the broad spectrum of human malignancies, most chemotherapeutic drugs are toxic and of limited medical value. We must support clinical research

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vi in its efforts to bring newer methods of cancer treatment to the clinic, methods that are less toxic and more effective. We believe cancer biotherapy will ultimately replace much of what we utilize today in cancer treatment. In light of this view, we want to thank all the authors for their dedication to purpose in writing this fifth edition of Principles. This book summarizes an evolving science and a rapidly changing medical practice. As we progress into the millennium, it now becomes possible to envision a much more diversified system of cancer research and treatment that will afford greater opportunities for our patients. As indicated in some of the chapters in Principles, there is increasing evidence that our historical “kill and cure” outlook in cancer treatment is in need of modification. Some forms of cancer biotherapy use the strategy of tumor growth stabilization and control through continued biological therapy over a longer period of time, akin to the use of insulin in the treatment of diabetes.

Preface These chapters illustrate some of these new methods of thinking and illustrate new strategies for the treatment and control of cancer. It is always difficult to move from past dogmas to future opportunities, but this fifth edition of Principles of Cancer Biotherapy illustrates why it is so important for researchers, regulators and clinicians to explore and apply these new opportunities in cancer biotherapy to the benefit of our patients. Robert K. Oldham, M.D.

Robert O. Dillman MD

References 1. DeVita VT Jr, Hellman S, Rosenberg SA. Biologic Therapy of Cancer. J.B. Lippincott, 1991. 2. Mitchell MS. Biological Approaches to Cancer Treatment. McGraw-Hill, 1993. 3. Rosenberg SA. Principles and Practices of the Biologic Therapy of Cancer. J.B. Lippincott, 2000.

Contents

Preface Robert K. Oldham

v

Contributors

ix

1. Cancer biotherapy: general principles Robert K. Oldham

1

2. The pathogenesis of cancer metastasis: relevance to therapy Sun-Jin Kim, Cheryl Hunt Baker, Yasuhiko Kitadai, Toru Nakamura, Toshio Kuwai, Takamitsu Sasaki, Robert Langley, and Isaiah J. Fidler

17

3. Developmental therapeutics and the design of clinical trials Robert K. Oldham

41

4. Recombinant proteins and genomics in cancer therapy Kapil Mehta, Bulent Ozpolat, Kishorchandra Gohil, and Bharat B. Aggarwal

53

5. Current concepts in immunology Robert K. Oldham

85

6. Therapeutic approaches to cancer-associated immune suppression Robert K. Oldham

101

7. Cancer vaccines Kenneth A. Foon and Malek M. Safa

147

8. Cytokines Walter M. Lewko and Robert K. Oldham

155

9. Interferons: therapy for cancer David Goldstein, Robert Jones, Richard V. Smalley, and Ernest C. Borden

277

10. Monoclonal antibody therapy Robert O. Dillman

303

11. Immunotoxins Arthur E. Frankel, Jung-Hee Woo, and David M. Neville

407

12. Drug Immunoconjugates Malek Safa, Kenneth A. Foon, and Robert K. Oldham

451

13. Targeted radionuclide therapy of cancer John M. Pagel, Otto C. Boerman, Hazel B. Breitz, and Ruby Meredith

463

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viii

Contents

14. Stem cell/bone marrow transplantation as biotherapy Robert K. Oldham

497

15. Cellular immunotherapy (CI), where have we been and where are we going? John R. Yannelli

505

16. Growth and differentiation factors as cancer therapeutics Kapil Mehta, Robert K. Oldham, and Bulent Ozpolat

527

17. Granulocyte colony-stimulating factor: biology and clinical potential MaryAnn Foote and George Morstyn

569

18. Granulocyte-macrophage colony-stimulating factor Maryann Foote and George Morstyn

581

19. Cancer gene therapy Donald J. Buchsbaum, C. Ryan Miller, Lacey R. Mcnally, and Sergey A. Kaliberov

589

20. Regulatory process for approval of biologicals for cancer therapy Antonio J. Grillo-López

613

21.1. Cancer biotherapy: 2009 disease-related activity Robert K. Oldham and Robert O. Dillman

631

21.2. Biological therapy of melanoma Robert K. Oldham

633

21.3. Biological therapy of genitourinary cancer Robert K. Oldham

645

21.4. Biological therapy of colon cancer Robert O. Dillman

659

21.5. Biological therapy of breast cancer Robert O. Dillman

669

21.6. Biological therapy of lung cancer Robert O. Dillman

679

21.7. Biological therapy of B and T cell lymphoproliferative disorders Robert O. Dillman

693

21.8. Biological therapy of multiple myeloma Robert K. Oldham

711

21.9. Biological therapy of squamous cell cancers of the head and neck Robert O. Dillman

713

21.10. Biological therapy of glioblastoma Robert O. Dillman

723

22. Speculations for 2009 and beyond Robert K. Oldham

733

Index

739

Contributors

Robert K. Oldham Hematology-Oncology Associates of Southeast Missouri Hospital Southeast Medical Plaza Cape Girardeau, MO USA

Toshio Kuwai Department of Cancer Biology M. D. Anderson Cancer Center The University of Texas Houston, TX USA

Robert O. Dillman Hoag Cancer Center Newport Beach, CA USA University of California Irvine, CA USA

Takamitsu Sasaki Department of Cancer Biology M. D. Anderson Cancer Center The University of Texas Houston, TX USA

Sun-Jin Kim Department of Cancer Biology M. D. Anderson Cancer Center The University of Texas Houston, TX USA Cheryl Hunt Baker Department of Cancer Biology M. D. Anderson Cancer Center The University of Texas Houston, TX USA Yasuhiko Kitadai Department of Cancer Biology M. D. Anderson Cancer Center The University of Texas Houston, TX USA Toru Nakamura Department of Cancer Biology M. D. Anderson Cancer Center The University of Texas Houston, TX USA

Robert Langley Department of Cancer Biology M. D. Anderson Cancer Center The University of Texas Houston, TX USA Isaiah J. Fidler Department of Cancer Biology M. D. Anderson Cancer Center The University of Texas Houston, TX USA Kapil Mehta Department of Experimental Therapeutics M. D. Anderson Cancer Center The University of Texas Houston, TX USA Bulent Ozpolat Department of Experimental Therapeutics M. D. Anderson Cancer Center The University of Texas Houston, TX USA

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x Kishorchandra Gohil Department of Internal Medicine The University of California Davis, CA USA Bharat B. Aggarwal Department of Experimental Therapeutics M. D. Anderson Cancer Center The University of Texas Houston, TX USA Kenneth A. Foon Department of Hematological Malignancies Nevada Cancer Institute Las Vegas, NV USA Malek M. Safa Division of Hematology / Oncology University of Cincinnati Cincinnati, OH USA Walter M. Lewko Cancer Cellular Therapeutics, Inc. Cape Girardeau, MO USA David Goldstein Department of Medical Oncology Prince of Wales Hospital Randwick, Sydney Australia Robert Jones Centre for Oncology and Applied Pharmacology CRUK Beatson Laboratories Glasgow, Scotland UK Richard V. Smalley (deceased) Synertron Inc. Madison, WI USA Arthur E. Frankel Cancer Research Institute of Scott &White Temple, TX USA

Contributors Jung-Hee Woo Cancer Research Institute of Scott &White Temple, TX USA David M. Neville Angimmune LLC, Bethesda, MD USA John M. Pagel The Fred Hutchinson Cancer Research Center Seattle, WA USA Otto C. Boerman University Medical Center Nijmegen The Netherlands Hazel B. Breitz Poniard Pharmaceuticals, Inc. Seattle, WA USA Ruby F. Meredith Department of Radiation Oncology University of Alabama Birmingham Birmingham, Alabama USA John R. Yannelli Department of Microbiology, Immunology and Molecular Genetics Markey Cancer Center University of Kentucky, School of Medicine Lexington, Kentucky USA MaryAnn Foote Thousand Oaks, CA USA Dr George Morstyn Department of Microbiology Monash University Victoria Australia

Contributors

xi

Donald J. Buchsbaum Department of Radiation Oncology University of Alabama at Birmingham Birmingham, AL USA

C. Ryan Miller Department of Pathology University of North Carolina Chapel Hill, NC USA

Lacey R. McNally Department of Radiology University of Alabama at Birmingham Birmingham, AL USA

Antonio J. Grillo-López Rancho Santa Fé, CA USA

Sergey A. Kaliberov Department of Radiation Oncology University of Alabama at Birmingham Birmingham, AL USA

1

Cancer biotherapy: general principles ROBERT K. OLDHAM

The term biotherapy encompasses the therapeutic use of any biological substance, but more specifically, it connotes the use of products of the mammalian genome. With modern techniques of genetic engineering, the mammalian genome represents the new “medicine cabinet.” Biological response modifiers (BRM) are agents and approaches whose mechanisms of action involve the individual’s own biological responses. Biologicals and BRM work through diverse mechanisms in the biotherapy of cancer. They may (a) augment the host’s defenses through the administration of cells, natural biologicals, or the synthetic derivatives thereof as effectors or mediators (direct or indirect) of an antitumor response; (b) increase the individual’s antitumor responses through augmentation or restoration of effector mechanisms, or decrease a component of the host’s reaction that is deleterious; (c) augment the individual’s responses using modified tumor cells or vaccines to stimulate a greater response, or increase tumor cell sensitivity to an existing biological response; (d) decrease transformation and/or increase differentiation or maturation of tumor cells; (e) interfere with growth-promoting factors and angiogenesis inducing factors produced by tumor cells; (f) decrease or arrest the tendency of tumor cells to metastasize to other sites; (g) increase the ability of the patient to tolerate damage by cytotoxic modalities of cancer treatment; and/or (h) use biological molecules to target and bind to cancer cells and induce more effective cytostatic or cytocidial antitumor activity. While several of these approaches involve the augmentation or use of biological responses, an understanding of the biological properties of immune response molecules, growth and maturation factors, and other biological substances will assist in the development of specific molecular entities that can act on biological responses and/or act directly on tumor cells. Thus, one can visualize the development of biological approaches with response-modifying as well as direct cytolytic, cytostatic, growth-inhibiting (antiproliferative), or maturational effects on tumor cells. Biotherapy is the fourth modality of cancer therapy and can be effective alone or in association with surgery, radiotherapy, and chemotherapy. To put biotherapy into perspective, it is important to dispel a historical miscon-

R.K. Oldham and R.O. Dillman (eds.), Principles of Cancer Biotherapy, © Springer Science + Business Media B.V. 2009

ception associated with immunotherapy: biotherapy can be effective against clinically apparent, even bulky, cancer, and treatment should not be restricted to situations where the tumor cell mass is imperceptible [64, 71]. Thus, the clinical trial designs for biotherapy can be similar to those used previously for other modalities of cancer treatment, as long as one measures both pharmacokinetics and the biological responses affected by these approaches [65]. Testing is continuing for biotherapy using the interferons, lymphokines, chemokines and cytokines, growth and maturation factors, angiostatic factors, monoclonal antibodies and their immunoconjugates, vaccines, and cellular therapy [68].

Historical Perspectives The use of chemical and biological compounds to modulate biological responses has been under active investigation for over 30 years. Although various chemicals, bacterial extracts, and viruses have been found to modulate immune responses in experimental animals, and, to a more limited extent, in humans, these “nonspecific” immunomodulators have not been highly effective in clinical trials [71]. Molecular biologists have recently developed techniques for the isolation of genes and their subsequent translation into appropriate production systems. These methods make available virtually unlimited quantities of highly purified biological compounds for experimental and therapeutic use. As a result, several classes of biologicals are being evaluated in preclinical models and clinical trials (Table 1). The continued investigation of nonspecific immunomodulators and adjuvants, as well as the recent advent of genetically engineered biologicals, makes the need for predictive preclinical assays of biological activity and efficacy apparent [33]. In vitro assays of biological activity (bioassays) are generally used to define and quantitate the activity of a given biological substance. Subsequently, flow cytometry, immunoperoxidase staining, enzyme-linked immunosorbent assays (ELISA), tetramer assays, radioimmunoassays (RIA), and variations of these methods allow the precise determination of levels of these molecules and activities in appropriate fluids and tissues.

1

2 Table 1. Biologicals and BRM Immunomodulators (chemicals, bacterial extracts, viruses, etc.) Lymphokines/cytokines α, β, γ-interferon; IL-1–32, tumor necrosis factor (TNF); etc. Growth/maturation factors (CSF, IL-2, EPO, etc.) Effector cells (cytotoxic and helper T cells, NK, and LAK cells, gene-engineered cells, etc.) Tumor-associated antigens and gene-engineered cellular vaccines Monoclonal antibodies Immunoconjugates

Finally, there is the need to assess the in vivo activity of these materials in preclinical models to develop predictive assays for clinical efficacy and provide information useful in the rational selection of agents and the design of clinical trials [33, 54]. Given the variability in the biological behavior of cancer and its interface with the human outbred host, it is not surprising that trials of nonspecific and specific immunotherapy, as translated from artificially constructed animal models, have not been uniformly successful in cancer treatment [4, 33]. Naturally occurring cancers arise in a particular organ from one cell or a few cells under some carcinogenic stimulus. In humans, these initial foci of cancer cells may grow – and sometimes lie dormant – over very long periods of time (from 1% to 30% of the human life span) before there is clinical evidence of cancer. Dissemination of cells from the initial focus may occur at any time during the development of the primary tumor. Subsequently, growth and metastasis occur over periods of months to years from primary and secondary foci, causing complex biological interactions to occur. In contrast, experimentally induced cancer is an artificial (even artifactual) situation. A short-duration, highdose carcinogen may be used to induce cancer quickly so that experiments can proceed rapidly. In transplantable models, the tumor cells are injected into young, normal, syngeneic animals, thereby circumventing the influences of environmental or genetic factors that may be operative in the natural host during tumor development. Many of the experimental models are transplantable tumors that have been maintained for decades and have only the most remote relevance to cancer in humans. The injection represents a single, instantaneous point source for a defined tumor load that has been manipulated in vitro. Regardless of whether that tumor load is 10 or 106 cells, it is being placed artificially in a single site and allowed to grow and metastasize from that selected and artificial, single site. Thus, these transplantable cancers are simply not analogous to clinical

Cancer biotherapy: general principles cancer and the conclusions drawn from them are unlikely to be broadly applicable to human cancers [33]. The modern era of cancer treatment began in the 1950s with the recognition that most cancers were systemic problems. It became obvious that lymphatic and blood-borne metastases often occurred simultaneously with local growth and regional spread. The early success of chemotherapy in leukemia and lymphoma prompted a massive and enthusiastic search for chemicals that might have cytolytic or cytostatic effects on cancer cells. Millions of compounds have been “screened” for antitumor activity [11], and this effort has given clinicians less than 75 “approved and active” anticancer chemotherapy drugs [84]. In addition, there are about 15 approved hormonal agents, ten targeted small molecules, and 25 biological drugs. There is now widespread recognition that only a few drugs in cancer treatment can effectively palliate and sometimes cure [19]. The development of three modalities (surgery, radiotherapy and chemotherapy) and their subsequent integration into what is now multimodal cancer treatment has been summarized [18, 20]. Between 1975 and 1990 a plateau was reached in cancer treatment. New surgical techniques (e.g., debulking, intra-operative methods for radiotherapy, and catheter isolation/infusion for chemotherapy) and new methods of radiotherapy (e.g., neutrons, protons, interstitial therapy, isotopes) continue to be developed, but these two modalities are primarily useful in local and regional cancer treatment. There has been continued, but slow, progress in the treatment of highly replicative, drug-sensitive malignancies over the past 15 years. It is now apparent that further progress with chemotherapy will depend on a greater understanding of the metabolic and enzymatic processes of cancer cells and the differences between these and normal cells. In addition, there are the problems of drug resistance, selectivity of action, and drug delivery. Cancer cells are more like than unlike normal cells with respect to chemotherapy sensitivity but they are more likely to become chemotherapy resistant with drug exposure. Many chemotherapeutic agents are highly cytolytic, but the problems of normal tissue toxicity, drug delivery, and tumor-cell resistance remain [19, 46]. Thus, cancer remains a systemic problem, and further systemic but more selective approaches are required for more effective treatment [20]. In addition to standard chemotherapy drugs that are approved and in clinical use, there are approximately 15 hormonal drugs available. These are primarily used in breast cancer and prostate cancer, and many are variations on the theme of blocking hormonal receptors. The evolution in this area has been primarily testing new

Robert K. Oldham hormonal agents for superiority in therapy and for lesser degrees of toxicity when used in large-scale trials against hormonally sensitive tumors. Then newest area of drug development is in targeted therapy. Here, small molecules are tested for the ability to block a particular receptor, enzyme, or target which may be involved in cell replication or cell metabolism. Eight targeted agents are currently available in the clinic, and a very large number of these small molecules are currently in clinical trials, most of which are variations on the theme of blocking a particular receptor or enzyme system with many of these drugs being multifunctional in that they can block more than one receptor or system. The scientific basis for biotherapy as the fourth modality of cancer treatment is now firm [21–23, 68, 70, 81, 82, 94, 97]. Historically, there was an attempt to establish immunotherapy in this role. Whereas immunotherapy was reproducible under specific experimental protocols, it was not strikingly effective in animals bearing palpable tumors and did not translate well to patients. Given the observation that immunotherapy was more effective with small tumor burdens, investigators began to study both “specific” and “nonspecific” immunotherapy as treatment for minimal residual disease. Although it became widely accepted that the treatment of animals with minimal residual disease was analogous to the postsurgical treatment of cancer in humans, this analogy was often stretched beyond reason. Immunotherapy in young, normal, syngeneic animals was often begun on the day of the tumor transplant (or within 1 or 2 days), using a transplant of a very small number of tumor cells (1–1,000) to a single site. In many of these studies, and in studies in which the tumor was surgically resected and no evident disease remained, the effects of immunotherapy were reasonably reproducible; the therapy was most beneficial when the tumor mass was less than 106 cells. These experimental results produced a dogma that immunological manipulation or immunotherapy could work only when the tumor cell mass was imperceptible [4, 71]. This posed real problems for clinical immunotherapy, since the tumor cell mass at clinical diagnosis or after surgery is usually three orders of magnitude (or more) greater than 106 cells. Despite the obvious difficulties with the experimental models and the translation to humans, clinicians began larger scale immunotherapy trials in the 1970s. The results of initial, small, uncontrolled trials were often reported as positive. Larger, randomized, controlled studies were done to confirm the efficacy of a particular immunotherapeutic regimen in a particular type of cancer. Although some of the controlled studies were positive, most yielded marginal or

3 negative results. Thus, immunotherapy had a poor image by the end of the 1970s [71, 109]. Immunotherapy failed to establish itself as a major mode of cancer treatment for several reasons. One important factor was the lack of definition and purity of immunotherapeutic agents. Many of the nonspecific approaches involved the use of complex chemicals, bacteria, viruses, and poorly defined extracts in an attempt to “stimulate” the immune response. Thus, molecular definition of the actual stimulating entity was not available. Given the lack of analogy between model systems and humans, the poorly characterized reagents, and the problems of variability in experimental procedures, the lack of demonstrable clinical efficacy was predictable [71]. Immunotherapy is not an appropriate term for the modern use of biologicals and BRM in medicine. Biological control mechanisms should be envisioned on a much broader basis than the immune system. While immunotherapy remains a subcategory of biotherapy, growth and differentiation factors, chemokines and angiostatic factors, the use of synthetically derived molecular analogs, and the pharmacological exploitation of biological molecules is much broader than immunotherapy (Table 1) [68]. Certain specific developments led to biotherapy becoming the fourth modality of cancer therapy. Advances in molecular biology have given scientists the capability to clone individual genes and produce significant quantities of highly purified genomic products as medicines. Unlike extracted and purified biological molecules, available in small quantities as semi-purified mixtures, the products of cloned genes have a level of purity on a par with drugs. They can be analyzed alone or in combination as to their effects in cancer biology. In addition, progress in nucleic acid sequencing and translation, protein sequencing and synthesis, the isolation and purification of biological products, and mass cell culture has given the scientific community the opportunity to alter nucleic acids and proteins at the nucleotide or amino acid level to manipulate then optimize their biological activity [42]. The elucidation of the human genome and the encoded products broadened the opportunities for advancements in biotherapy. As a result of gene cloning, a major approach in cancer treatment has evolved. Interleukin-2 can be used to stimulate the growth of a broad range of lymphocytes (T, NK, and LAK cells). This has given clinicians the ability to have large quantities of specific subclasses of effector cells for cancer treatment. Emerging evidence suggests that these effector cells can be helpful in the regional and systemic treatment of advanced, bulky

4 cancer. It was the availability of Interleukin-2 that allowed this technology to prosper [83]. In addition, IL-2 is now being used as the T cell growth factor for gene engineered lymphocytes containing new genes to enhance their cancer treatment capacity [80, 103]. Another major technical advance was the discovery of hybridomas. A major limitation on the use of antibodies had been the inability to make reproducible hightiter, specific antisera and to define these preparations on a molecular basis. Immunoglobulin reagents can now be produced with the same level of molecular purity as cloned gene products and drugs. Processes to easily “humanize” antibodies have produced therapeutic antibodies with excellent specificity, low immunogenicity and optimal pharmacokinetics. These antibodies are also powerful tools in the isolation and purification of tumor-associated antigens, lymphokines/cytokines, and other biologicals, which can then be used in biotherapy. The advances in molecular biology and hybridoma technology have eclipsed previous techniques for the isolation and purification of biological molecules [63, 77]. Technical advances in instrumentation, computers, and computer software have been critically important in the isolation and purification of biological molecules. The construction of nucleotide or amino acid sequences to fit any biological message is now possible. While this synthetic capability is currently limited to smaller gene products, techniques by which analysis and construction of nucleotide sequences will occur in an automated way, making enormously complex molecules possible to synthesize and manufacture, are rapidly becoming available.

Cancer biotherapy: general principles neoplasms [33]. There may exist in animals and in humans specific or nonspecific defects important in the development of their autochthonous tumors. Corrections of such defects may require a form of biotherapy totally different from that required to assist the normal host in controlling a transplanted cancer.

Model Screening Criteria Theoretically, an ideal procedure for screening new biologicals should employ a system of sequential and progressively more demanding protocols designed to select a maximum number of effective agents. The term screening denotes a series of sequential assays through which promising agents are tested for therapeutic potential. For some biotherapies, a general screening procedure may be inappropriate. For example, the activity of a monoclonal antibody with antitumor specificity would not be detected by use of the general screen of biological activity. Design considerations for general screening in biotherapy have been extensively reviewed [33, 54, 56, 61]. A step-by-step approach to the screening of potential BRM was developed to define their effects on T-cell, B-cell, NK-cell, and macrophage functions. A progressive in vitro and then in vivo sequence allows the variables of dose, schedule, route, duration and maintenance of activity, adjuvanticity, and synergistic potential to be explored in an orderly fashion [33]. Unfortunately, the screening program was used only briefly by the NCI and no replacement program is now in use.

Evaluation of Screening Programs

Preclinical Models Biological Activity in Preclinical Models Central to the identification of biotherapy that might be useful in cancer patients is the recognition that, in the main, the challenge in humans is the eradication of metastases. Metastases can result from the dissemination of different subpopulations of cells within the primary neoplasm [32]. This may explain the observation that cells within a metastasis can be antigenically distinct from those that predominate in the parental tumor [32]. Metastases may also emanate from other metastases. The implications of cellular heterogeneity as it relates to the outcome of the specific immunotherapy are obvious. In addition, normal animals are not comparable to animals or humans bearing autochthonous

Screening programs for chemotherapeutic agents were initiated in the mid-1950s, and attempts have been made to randomly examine thousands of compounds for antitumor activity [11]. Such large screening programs are empirically rather than rationally based, and are no longer appropriate [4, 5, 20, 33, 71]. Whether induced or transplantable animal tumor systems are valid models for testing therapeutic approaches for human cancer has been a controversial issue [33]. In patients, therapy successful against one type of cancer may not be successful against another type, or even for another patient with the same histological type of cancer. Unlike the model systems, in which treatment can be given with precise timing relative to the metastatic phase of a resected tumor or injected tumor cells, cancer diagnosis in humans is generally late, and micrometastases (and often macro-metastases) have become

Robert K. Oldham well established before treatment can be initiated. Thus, screening programs can only provide tentative indications on agents and approaches of interest.

Biotherapy: Specific Agents and Approaches Nonspecific Immunomodulators Since the early 1900s, immunotherapy with bacterial or viral products has been utilized with the hope of “nonspecifically” stimulating the host’s immune response [71]. These agents had been useful as adjuvants and as nonspecific stimulants in animal tumor models, but human trials have been disappointing. Perhaps purified viruses or specific chemicals will lead to the development of more effective adjuvants or stimu-

5 lants of the immune response. Bacillus Calmette-Guerin (BCG) and other whole organisms were used early in immunotherapy. The use of a purified derivative of bacterial components, such as muramyl di- or tripeptide, “packaged” in liposomes as a method to stimulate macrophages to greater anticancer activity has also been tried. Such adjuvants may prove useful with genetically engineered or synthetic tumor-associated antigens, active specific immunotherapy, or immunoprophylaxis. Multiple agents that appear capable of augmenting one or more immune functions already exist. Several of these have been associated with prolongation of survival in prospectively randomized trials involving patients with a wide variety of malignancies (Table 2). Although some of these agents have produced modest clinical benefits, and do represent a potential method of immune augmentation, it is doubtful that they will have a major role in future cancer therapy. Great problems

Table 2. Biologicals and biological response modifiers Immunomodulating agents Alkyl lysophospholipids (ALP) Azimexon BCG Bestatin Brucella abortus Cornyebacterium parvum Cimetidine Sodium diethyldithiocarbamate (DTC) Endotoxin Glucan ‘Immune’ RNAs Krestin Lentinan T-cell growth factors (‘TCGF’ – interleukin 2 [IL-2]) Levamisole Muramyldipeptide (MDP), tripeptide (MTP) Maleic anhydride-divinyl ether (MVE-2) Mixed bacterial vaccines (MBV) Nocardia rubra cell wall skeletons (CWS) Picibanil (OK432) Prostaglandin inhibitors (aspirin, indomethacin) Thiobendazole Tuftsin Interferons and interferon inducers Interferons (α, β, γ) Poly IC-LC Poly A-U GE-132 Brucella abortus Tilorone Viruses Pyrimidinones Thymosins Thymosin alpha-1 Thymosin fraction 5 Other thymic factors

Lymphokines, cytokines, growth/maturation factors Antigrowth factors Chalones Colony-stimulating factors (CSF) Growth factors (transforming growth factor, TGF) Lymphocyte activation factor (LAF-interleukin 1 [IL-1]) Lymphotoxins (TNF, α, β, LT) Macrophage activation factors (MAF) Macrophage chemotactic factor Macrophage cytotoxic factor (MCF) Macrophage growth factor (MGF) Migration inhibitory factor (MIF) Maturation factors Interleukin 3–18, etc. Thymocyte mitogenic factor (TMF) Transfer factor Transforming growth factor (TFR, α, β) Antigens Tumor-associated antigens Molecular vaccines Cell-engineered cellular vaccines Effector cells Macrophages NK cells Cytotoxic T cells LAK cells T helper cells Miscellaneous approaches Allogeneic immunization Liposome-encapsulated biologicals Bone-marrow transplantation and reconstitution Plasmapheresis and ex vivo treatments (activation columns, immunoabsorbents, and ultrafiltration) Virus infection of cells (oncolysates)

6 exist for most of the agents, including lack of chemical definition, low purity, and poor reproducibility from one lot to another. An additional problem has been the inability to define clearly a mechanism of action for these agents in humans. The preclinical screening established by the Biological Response Modifiers Program (BRMP) of the National Cancer Institute was one mechanism to do this [31]. Data from this type of screening with subsequent phase I and phase II clinical data could have provided interesting insights and correlations [98, 104, 105]. Unfortunately, this approach has been abandoned. The ability to specifically control and manipulate immune responses with highly purified, defined molecules obtained by genetic engineering is the future. Thus, it seems probable that nonspecific immunotherapy as a sole modality has become obsolete, although as adjuvants some may find a role in active specific immunotherapy (Chapter 6).

Active Specific Immunotherapy There has been a substantial effort to produce active immunization of autochthonous or syngeneic hosts with irradiated or chemically modified tumor cells in an attempt to use active specific immunotherapy (AST) [46]. Inherent is the assumption that tumor cells express immunogenic tumor-associated antigens (TAA). Treatment of tumor cells with a variety of unrelated agents, such as irradiation, mitomycin, lipophilic agents, neurominidase, viruses, or admixtures of cells with bacterial or chemical adjuvants, has produced non-tumoroigenic tumor cell preparations that are immunogenic upon injection into syngeneic hosts (Table 3). AST using BCG-tumor cell (“antigens”) vaccines has been reevaluated using a syngeneic guinea pig hepatocarcinoma. The definition of several variables of vaccine preparation, such as a ratio of bacterial organisms to viable, metabolically active tumor cells, the procedures of tumor cell dissociation and cryobiologic preservation, and the irradiation attenuation of cells, has resulted in the development of an effective non-tumorigenic vaccine. It has proven effective in both micro- and macro-metastatic disease [47]. The nature of the anatomic alteration in metastatic nodules after AST was explored using a specific monoclonal antibody to assess vascular permeability within these tumor nodules [50, 51]. Immunohistologic analysis demonstrated significantly more antibody in tumors from vaccinated animals than in comparable tumors from unvaccinated guinea pigs. These data support the hypothesis that the anatomic characteristics of tumor foci restrict drug and antibody access, thus pro-

Cancer biotherapy: general principles Table 3. Studies of immunotherapy with random designs Specific cancer and type of immunotherapy Leukemia BCG/AML BCG/Cells/AML MER/AML CP/Cells/AML All/Hodgkin’s NHL/MM Lev/ALL BDG/NHL Lev/MM Lung cancer IT BCG IP BCG IP BCG & Lev IP CP Lev Thy Fr V BCG/Cells TAA/Freund’s Adjuvant Breast cancer Poly A/Poly U BCG Lev Colon cancer BCG MER CP Lev Melanoma IL/BCG BCG/BCG + Cells BCG CP Lev

Positive studies

+ + + +

+

+ + + + +

+ + +

+ + +

+ +

+ + + +

+

+ + + + + + +

Genitourinary cancer IC BCG/bladder BCG/prostate

+ +

Gynecological cancer CP/cervix CP/ovary BCG/ovary

+ +

Other cancers Lev/H & N CP/H & N BCG/Cells/Sarcoma MER/Neuroblastoma

Equivocal Negative studies studies

+ + + +

+

+ + + +

tecting tumors not only from immunotherapy but from other forms of treatment as well [45].

Robert K. Oldham The regulation of the blood supply to neoplastic tissue may be unique in comparison to normal tissue. Tumor metastatic nodules may have a vascular “barrier,” which contributes to a limitation in delivery for chemotherapeutic agents, monoclonal antibodies, and immune effector cells. Such vascular barriers may provide an environment in which some tumor cells survive blood-borne chemotherapeutic and biologic agents. Thus, solid tumor nodules may serve as “pharmacologic sanctuaries,” allowing even drug-sensitive tumor cells to continue to grow [45–47]. Hanna and co-workers [47] demonstrated that strategically timed chemotherapy subsequent to immunotherapy can effectively double the number of survivors attainable with immunotherapy alone. This effect was not drug specific. These results suggest a new basis for AST in the treatment of solid tumors. Inflammatory disruption of anatomic barriers of metastatic nodules combined with strategically administered chemotherapy or biotherapy may prove useful in the design of future biotherapy trials in humans. Another approach used more recently involves the delivery of lymphokines and cytokines, such as interleukins, colony stimulating factors, tumor necrosis factor, lymphotoxins, macrophage cytotoxic factors, and activated complexes (such as those generated by plasma perfusion over protein A columns) to the tumor and its vascular bed. These substances are known to have powerful effects on tumor vasculature and cellular infiltrations, something leading to tumor necrosis. This approach may, in addition, increase the access of antibody, immunoconjugates, drugs, and activated cells to the cancer nodule [45]. A more recent method to influence the blood supply of tumor nodules has been the use of a monoclonal antibody, Bevacizumab, which targets the vascular endothelial growth factor (VEGF) receptor. Bevacizumab is primarily used with chemotherapy, and it may be there are similar mechanisms at play with regard to increasing chemotherapy drug access to tumor nodules by the use of a monoclonal antibody targeting the VEGF receptor [38, 49, 52]. A major limitation of AST has been the availability of purified TAA. Whereas whole cell vaccine preparations contain viable, non-tumorigenic cells prepared from individual tumors, purified TAA is now prompting largescale immunization. TAA purification and characterization followed by genetic engineering of the antigen for vaccine production is underway and several purified antigens are in clinical trials, especially in melanoma. Alternatively, synthetic peptide sequences of the active portion of TAA may prove useful in the near future. Even the combining site of antibody to TAA has recently been suggested as a potential vaccine. These technologies

7 are now undergoing extensive preclinical and clinical evaluation (see Chapter 7).

Thymic Factors It has been known for years that thymic extracts have immunological activity [40, 41]. Thymosin fraction 5 and thymosin alpha-1 have received the most attention in the laboratory and the clinic. Thymosin fraction 5 is an extract containing a variety of thymic polypeptides, and alpha-1 is a synthetic polypeptide component present in many thymic extracts. Thymic preparations have been shown to enhance and suppress immune responses in both intact and thymectomized animals. Many investigators have reported that the thymosins can correct selected immunodeficiency states, both natural and experimentally induced. There have also been reports that thymic factors can augment suppressed or depressed T-cell responses in patients with cancer. Studies in preclinical screening have demonstrated stimulation of T-cell activity [99], but clinical studies have not shown striking effects [25, 98, 99], and none have been approved for clinical use.

Recombinant DNA Technology Recombinant DNA technology, commonly referred to as genetic engineering, has provided us with the tool for the biosynthesis and subsequent mass production of a significant number of biologicals [8, 29, 39]. This is highly relevant to lymphokines/cytokines as well as growth and maturation factors, and should revolutionize the treatment of cancer over the next 10 years. The process involves the incorporation (recombination) of a segment of a DNA molecule containing a desired gene into a vector, usually a plasmid, which in turn is inserted into a host organism, usually an Escherichia coli, although other bacteria, yeasts, insects, and mammalian cells have been utilized. The cells are cloned and the cells producing the desired protein or polypeptide are selected. This clone is mass produced using fermentation techniques, and the protein molecule is harvested and purified. The resultant product is a highly purified (95–99%) protein solution, and has a high specific activity (i.e., biological activity per weight of protein). The relevant DNA can be obtained by a variety of methods. Once messenger RNA (mRNA) is isolated, complementary DNA (cDNA) can be produced through the use of reverse transcriptase. Alternatively, an artificial DNA molecule can be constructed once the nucleotide or amino acid sequence is known. This can be used to isolate the complementary sequence, which is then isolated and cloned. RNA molecules can also be used in cell-free systems

8 Table 4. Clinical lymphokines/cytokines Colony-stimulating factors Erythropoietin Interferons: α, β, γ Interleukins 1–32, etc. Lymphotoxincs: α, β (TNF) Macrophage-activating factors Thymosins Transfer factor(s)

to produce these biologicals. There are over 200 restriction enzymes that can cut desired fragments of DNA and lead to their isolation. These enzymes can uniquely cleave a DNA molecule at specific, predictable sites relative to the nucleotide sequence. These fragments are then incorporated into the plasmid, and combine with plasmid DNA. Plasmids have a symbiotic relationship with selected bacteria inducing resistance to a variety of antibiotics, which allows for selection of engineered clones. A number of alpha interferons, as well as beta and gamma interferon, have been genetically engineered [24, 39, 106, 111]; multiple interleukins, colony-stimulating factors, and tumor necrosis factor have been cloned [107]. The number of cloned biological products increases yearly (see Chapter 4). These biological products and their receptors (Table 4) are rapidly being translated into highquality pharmaceuticals for clinical testing and approval for general use.

Lymphokines/Cytokines Lymphokines and cytokines are molecules secreted by a variety of cells (Table 4). They provide one means through which the cells involved in the immune process communicate with one another and direct the overall process [40]. Lymphokines/cytokines with specific effects on cell proliferation have been identified and may prove useful as anticancer agents. Interleukins (IL) 1–32 are among the multiple lymphokines that appear to be involved in a cascade phenomenon leading to the induction of a variety of immune responses [86]. Other examples include multiple subclasses of colony-stimulating factors (CSF) chemokines and ligands. The list of lymphokines/cytokines is long, and the potential for therapeutic manipulation is great [73, 74]. The identification of these biological activities is the start of a process that should ultimately provide us with the knowledge and the tools to identify more accurately and control a number of immune responses. Physicians may then be able to manipulate the immune system (Fig. 1) intelligently, in favor of the host. Further, by selective activation

Cancer biotherapy: general principles and subsequent cloning in vitro, T-cell lines with specific cytotoxic and helper capabilities can be obtained and utilized in autologous and allogeneic adoptive immunotherapy [16, 27, 93, 103, 112]. Many investigators have held the rather simplistic view that the immune system (Fig. 1) might be manipulated in vivo and corrected to better deal with the cancer problem. Evidence to date suggests that the pharmacologic use of biologicals, in rather high doses, is a more effective method for cancer treatment, with immunoactivation and immunomodulation, playing the dominant roles [69, 70]. Another specific use of lymphokines may be in the pharmacological regulation of tumors of the lymphoid system. Although many of these tumors are considered to be generally unresponsive to normal growth-controlling mechanisms mediated by lymphokines, it is possible that large quantities of pure lymphokines administered as medicinals, or the use of certain molecular analogs of these naturally occurring lymphokines, may be useful in the treatment of lymphoid malignancies. The use of certain lymphokines/cytokines has been extended to other cancers, in that in vitro observations suggest an antiproliferative activity in some solid tumors. These antiproliferative effects might be maximized by testing the tumor cells of each patient to “custom tailor” the treatment rather than giving these biologicals as general treatment, as has been done with anticancer drugs [70]. IL-1, originally known as lymphocyte activating factor, is a macrophage-derived cytokine that has an enhancing effect on murine thymocyte proliferation. Both IL-1 and viable macrophages are necessary for the initial step in activation of IL-2 (Fig. 2). Cloning of IL-1 and IL-2 has made large quantities of highly purified materials available for clinical studies. Preclinical studies with IL-2 have been oriented around in vitro cell production protocols and induction or maintenance of antitumor T-cell effects in vivo [15, 16, 67, 70]. IL-2 has been used to activate peripheral blood cells and initially stimulated much interest [93, 104]. These activated cells are generally more cytotoxic against cancer cells than normal cells; however, their lineage can be T cell or NK cell (LAK cells) depending on the technique employed. This approach, though expensive and technically demanding, illustrates that cellular therapy is feasible and can be effective [67, 70, 85, 103]. A lymphotoxic product of antigen/mitogen-stimulated leukocytes was called lymphotoxin [92]. Lymphotoxin may be a principle effector of delayed hypersensitivity and, although conflicting data have been reported, may also be involved in the cytoxic reactions of T-cell-mediated

Robert K. Oldham

9

Figure 1. Immune response

lysis and NK- or K-cell lysis. Depending upon the type of tumor cell involved, the in vitro effect of lymphotoxin may be either cytolytic or cytostatic. Mouse tumor cells are frequently killed by homologous and heterologous lymphotoxins, whereas in other species reversible inhibition of tumor cell proliferation is more common [48]. Human lymphotoxin is of at least two species, alpha and beta [30, 37, 60, 88, 108]. Alpha lymphotoxin is tumor necrosis factor (TNF). Both have been cloned, and TNF has undergone rather extensive clinical trials [31, 91, 101]. While some antitumor responses have been seen, the lymphotoxins have not been highly efficacious as single agents in the treatment of advanced human tumors and the toxicity of systemic administration has been unacceptable. Continued trials are underway combining lymphotoxins such as TNF with other lymphokine/cytokines and with chemotherapy. Targeted delivery of these molecules may prove more efficacious since they have high toxicity administered intravenously with what is probably minimal delivery to the tumor cell

site [60, 28]. Thus, intratumoral and regional perfusion studies with TNF have yielded positive results in patients with melanoma and sarcoma [17, 53, 59, 60, 90]. There is now evidence that the combined use of various lymphokines may produce enhanced antiproliferative effects. Selective assays for lymphokine antiproliferative cocktails may prove useful in “tailoring” such preparations for individual patients [6, 95, 97, 102, 100, 110]. More than 100 biological molecules have already been described and named as lymphokines/cytokines (Table 5). Biologicals such as the interferons, lymphotoxins, TNF, CSF, IL-1–22 are now under evaluation (see Chapter 8). The studies require quantities of material obtained through genetic engineering, using sensitive and rapid assay procedures to monitor production, purification, and bioavailability.

Interferons Interferons are small, biologically active proteins with antiviral, antiproliferative, and immunomodulatory

10

Cancer biotherapy: general principles Monocytic Macrophage

Ag Stimulated T Cell

? CSF

Activated Macrophage

IL-1

Activated T cells

Ag Stimulated T cell

IL -2

Effector T cell Precursor

Mature Effector T Cells

Figure 2. Model for interleukin stimulation of T-cell immune responses

activities (see Chapter 9). Each interferon has distinctive capabilities in altering a variety of immunological and biological responses. As a class, the interferons appear to have some growth-regulating capacity in that antiproliferative effects are measurable with in vitro assays and in animal model systems. The relative efficacy of the mixtures of natural interferons that occur after virus stimulation as compared to the cloned interferons remains to be precisely determined. There are more than 20 interferon molecules (and theoretically hundreds of recombinant hybrids there from), and efforts are underway altering individual interferon molecules in specific ways, so the range of biological activities of the interferons as antiviral agents, as immunomodulating agents, and as antiproliferative agents may be very broad [66, 69]. In addition to antiviral and antiproliferative activity, the interferons have profound effects on the immune system. Low doses enhance antibody formation and lymphocyte blastogenesis, while higher doses inhibit

these functions. Low to moderate doses may inhibit delayed hypersensitivity while enhancing macrophage phagocytosis and cytotoxicity, natural killer activity, and surface antigen expression. Interferons prolong and inhibit cell division (both transformed and normal cells). In addition, interferons stimulate the induction of several intracellular enzyme systems with resultant profound effect on macromolecular activities and protein synthesis. We can draw some preliminary conclusions about interferon therapy for human cancer [9, 36, 43, 44, 57, 69, 96] (Tables 6 and 7). One is that the Cantell, lymphoblastoid, and recombinant alpha-interferons are surprisingly similar, both quantitatively and qualitatively, in their toxicity, antitumor efficacy, and other biologic effects. Second, objectively defined antitumor responses in phase I alpha-interferon trials (mostly involving lymphoma, myeloma, Kaposi’s sarcoma, melanoma, and renal cancer) were observed in approximately 10% of all patients treated. That level of activity may not seem impressive, but it does exceed the average response rate of 1–2% in phase I trials of chemotherapeutic agents. We should also note that very few responses in patients with tumors of the breast, colon, lung, or lower genitourinary system have been seen with alpha-interferon as a single agent. Overall, even though interferons have toxicities, they were more tolerable and less permanent than those observed in early-phase chemotherapy testing. A third impression, suggested by increased response rates with higher alpha-interferon doses, is that interferons may produce their acute antitumor effect by a direct cytostatic action, rather than an indirect immunomodulatory mechanism [12, 23, 57, 66, 69, 72, 98]. Finally, clinical experience with beta- and gammainterferons indicated that both produce response rates and response patterns similar to those obtained with alpha-interferon, although beta-interferon is only approved for multiple sclerosis and gamma only for chronic granulomatous disease. What is clear from the current preclinical and clinical studies is that the interferons have antitumor activity even in bulky, drug-resistant cancers [102]. Clinical activity has been seen most reproducibly in several lymphomas and leukemias (Table 6), but responses in many other tumor types with approval in melanoma and renal cancer [36].

Growth and Maturation Factors Using technology similar to that employed for lymphokine/cytokines, scientists have cloned and produced a variety of growth and maturation factors. The

Robert K. Oldham

11

Table 5. Antigen-nonspecific mediators,a unrestricted by MHC Helper factors LAF (lymphocyte-activating factor, IL-1) NMF (normal macrophage factor) BAF (B-cell-activating factor) TRF (T-cell-replacing factor) MP (mitogenic protein) TDF (thymus differentiation factor) Transferrin MF (mitogenic [blastogenic] factor) NSF (nonspecific factor) TDEF (T-cell-derived enhancing factor) TEF (thymus extracted factor) Complement components DSRF (deficient serum-restoring factor) Suppressor factors Inhibitor(s) of DNA synthesis AIM (antibody-inhibitory material) IDA (inhibitor of DNA synthesis) LTF (lymphoblastogenesis inhibition factor) FIF (feedback inhibition factor) MIFIF (Mif inhibition factor) SIRS (soluble immune response suppressor) IRF (immunoregulatory gamma-globulin) Chalones IF (interferons) AFP (alpha-fetoprotein) LDL (low-density lipoproteins) CRP (C-reactive protein) Fibrinogen degradation products NIP (normal immunosuppressive protein) LMWS (low-molecular-weight suppressor) HSF (histamine-induced suppressor factor) TCSF (T-cell suppressive factor) Factors acting on inflammatory cells MIF (migration inhibitory factor) MCF (macrophage chemotactic factor) MSF (macrophage slowing factor) MEF (migration enhancement factor) MAF (macrophage activating factor) MFF (macrophage fusion factor) PRS (pyrogen-releasing substance) LIF (leukocyte inhibition factor) NCF (neutrophil chemotactic factor) PAR (products of antigenic recognition) BCF (basophil chemotactic factor) ECF (eosinophil chemotactic factor) a

ESP (eosinophil stimulation factor) LCF (lymphocyte chemotactic factor) LTF (lymphocyte trapping factor) Factors acting on vascular endothelium SRF (skin reactive factor) TPF (thymic permeability factor) LNPF (lymph node permeability factor) LNAF (lymph node activating factor) AIPF (anaphylactoid inflammation promoting factor) IVPF (increased vascular permeability factor) Factors acting on other cells Interferons TMIF (tumor cell migration inhibition factor) OAF (osteoclast activating factor) Fibroblast chemotactic factor Pyrogens FAF (fibroblast activating factor) Growth-stimulating factors BCGF (B-cell growth factor) BCDF (B-cell differentiation factor) MGF (macrophage growth factor) MF (mitogeni [blastogenic] factor) LIAF (lymphocyte-induced angiogenesis factor) CSF (colony-stimulating factor) TDF (thymus differentiation factor) Thymopoietin, thymosin TCGF (T-cell growth factor, IL-2) IL-3 (interleukin 3) EGF (epidermal growth factor) Direct-acting factors Lysosomal enzymes CTF (cytotoxic factors) MTF or MCF (macrophage toxic [cytotoxic] factor) SMC (specific macrophage cytotoxin) MCF (macrophage cytolytic factor) ACT (adherent cell toxin) Chromosomal breakage factors Microbicidal factors LT (lymphotoxin) PIF (proliferation inhibitory factor) CIF (cloning inhibition factor) IDS (inhibitor of DNA synthesis) Transforming factors TNF (tumor necrosis factor)

These names/factors are based on biological activity. Several may represent the activity of a single molecule.

clinical trials have focused mainly on erythropoietin and the colony-stimulating factors. The former is a drug now approved for use in refractory anemia, and GM-CSF and GCSF are approved for the treatment of bone marrow dysplasia and chemotherapy-induced marrow suppression. Oprelvekim to stimulate platelet production is now approved. These factors are reviewed in later chapters, but it should be noted that they represent only the early beginnings of the very broad field of growth and matu-

ration factors (See Chapter 16). It is now clear that a variety of biological substances up- and down-regulate growth of both normal and neoplastic cells. These substances may stimulate or inhibit growth and may change the maturation cycle of various normal and neoplastic cells. Contained within this broad category of factors are the tumor growth factors, colony-stimulating factors, and a variety of still to be defined factors important in the regulation of cell growth and maturation. Future

12

Cancer biotherapy: general principles

Table 6. Apha-interferon activitya Active Hairy-cell leukemia Chronic myelogenous leukemia Myeloproliferative disorders Non-Hodgkin’s lymphoma Cutaneous T-cell lymphoma Kaposi’s sarcoma Multiple myeloma Melanoma Renal cell carcinoma Bladder cancer (intravesical) Inactive Breast cancer Colon cancer Lung cancer Prostate cancer Acute myelogenous leukemia a

As a single agent.

Table 7. Malignancies: Summary of responses to alphainterferon with date of FDA approval Tumor type

Response rate (%)

Multiple myeloma Hairy cell leukemia Low-grade lymphoma High-grade lymphoma Kaposi’s sarcoma Chronic myelogenous leukemia Melanoma Renal cancer

18–27 80–90 38–73 0–10 25–40 80–90 20–30 10–20

Approved 1986 1997 1988 1995 1995

therapeutic use of these factors may regulate growth and spread of cancer. Such a chronic growth restraining strategy may not “cure” cancer; rather treatment may be more analogous to using insulin in diabetes. This is a field that is undergoing explosive growth and should be watched carefully over the coming decade for molecules with therapeutic activity.

Monoclonal Antibodies The advent of hybridoma technology in the late 1970s made available an important tool for the production of monoclonal antibodies for therapeutic trials [10] (see Chapter 10). These antibodies are now being produced in huge quantities and in highly purified form for cancer treatment. The humanization of murine antibody combining sites has yielded a whole new class of therapeutic antibodies [84]. They will undoubtedly define a new range of

antigens on the cell surfaces, which will improve our understanding of cell differentiation and of cancer biology. Major problems in understanding the biology of the cancer cell have been the difficulties of isolating, purifying, and characterizing tumor-associated antigens (TAA). The use of monoclonal antibody technology will improve the definition of the neoplastic cell surface and identify its differences from the normal counterpart. This will be of great value in cancer diagnosis and histopathologic classification, and will be useful in the imaging of tumor cell masses and in the therapy of cancer [1, 7, 13, 14, 32, 33, 34, 35, 50, 51, 55, 63, 75, 84, 89]. Finally, antibodies may be a useful reagent in treating certain immune deficiencies and in altering immune responses. The removal of T cells from bone marrow to improve bone marrow transplantation techniques is an example of using antibody as a BRM [63]. A more recent example is the use of anti-CTLA-4 antibodies to regulate the immune response. Two monoclonal antibodies are in development that have influence on T-regulatory cells, which influence the immune response to cancer. It is already clear that this class of monoclonal antibodies can influence T-regulatory cells in a yet undefined manner, such that regression of bulky melanoma can occur. At the same time, they give a range of interesting toxicities with regard to uveitis, colitis, and depigmentation syndromes relative to their use in melanoma [26]. In spite of encouraging data from the use of antibodies and, especially, immunoconjugates to target toxic substances to cancer, the heterogeneity of cancer is an important consideration [2, 71–78, 87]. If a single antibody or a fixed combination of a few antibodies covering only a portion of the tumor cells is used, and if that preparation does not eliminate the true replicating cell population (stem cell) from the patient’s tumor population, eventual outgrowth of viable, perhaps resistant cells is inevitable. Therefore, it seems logical to proceed with attempts to type human tumors and to deliver toxic substances to them utilizing “cocktails” of antibodies sufficient to cover all the tumor cells suspected of replication in each patient. This type of approach may require a considerable amount of testing for each patient and a “typing” of one or more tumors from each patient [3, 58, 62, 78, 79, 87]. Such approaches may be more individually designed than is easily approachable through the product development paradigm that has been used in the development of new anticancer drugs. If however, the spectrum of human tumor heterogeneity is great, the goal of the ideal antibody conjugated to the ideal toxic agent may not be achievable.

Robert K. Oldham

Future Perspectives How rapidly will biotherapy develop and what role will it have in cancer treatment in the next decade? It is certain that we now have much more powerful tools for improving cancer therapy in the future. We now have the techniques to decipher the major problems in cancer biology down to the genetic level. These techniques, along with the recognition that biotherapy can provide increased selectivity in cancer treatment, support the belief that new and highly effective approaches are near. Biotherapy provides an additional technique, which may work effectively in combination with surgery or radiotherapy (to decrease the local and regional tumor) or with chemotherapy (to reduce the systemic tumor burden). It may work very effectively via antibodies in directing radioisotopes selectively to the tumor site, and with chemotherapy, toxins, and other cytostatic or cytotoxic molecules in directing the agent to the tumor bed, enhancing activity and selectivity. The use of biotherapy is at an early stage. We have already seen that highly purified biologicals can be effective in patients with clinically apparent, even advanced, bulky cancer. Clinical studies with alpha-interferon have demonstrated the responsiveness of radiation- and drugresistant lymphoma, melanoma, and renal carcinoma. IL-2 with effector cells or alone (in high doses) produces partial and complete remissions in melanoma and kidney cancer. These results, along with the clinical results using monoclonal antibody alone and conjugated to toxic substances in selected cancers (lymphoma, melanoma, gastrointestinal, leukemia and breast cancer), confirm the concept that we need not think of biotherapy as a tool that can be used only in patients with undetectable and minimal residual tumor burdens [84]. While this modality may work best with minimal tumor burdens (a situation that is also true for chemotherapy), biotherapy can be used as a single modality in clinically apparent disease. It may be even more effective in multimodality treatment regimens. Biotherapy offers the hope for selective treatment to enhance the therapeutic/toxic ratio and lessen the problem of nonspecific toxicity, a major impediment to the development of more effective cancer treatment. This decade will provide many opportunities to pursue new approaches in cancer treatment. These approaches will employ new techniques in the laboratory and clinic, requiring special training and expertise. The medical oncologist trained in the administration of chemotherapy drugs, is not necessarily well prepared to give biologicals for cancer treatment. Biotherapy uses biological substances that are often active on, or work in

13 association with, the immune system. The tremendous diversity of this system is best understood by clinical immunologists and cell biologists who are well suited to assist in the translation of biotherapeutic approaches to the clinic. Given these new techniques and new approaches, we must redesign many of the mechanisms for developmental therapeutics [59]. It may well be that the specificity of biologicals will require that biotherapy be developed in an individualistic fashion and applied to each patient in a specific, personalized way. This concept was conceptualized in 1977 by the Nobel laureate Sir Peter Medawar: The cure of cancer is never going to be found. It is far more likely that each tumor in each patient is going to present a unique research problem for which laboratory workers and clinicians between them will have to work out a unique solution.

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2

The pathogenesis of cancer metastasis: relevance to therapy SUN-JIN KIM, CHERYL HUNT BAKER, YASUHIKO KITADAI, TORU NAKAMURA, TOSHIO KUWAI, TAKAMITSU SASAKI, ROBERT LANGLEY, AND ISAIAH J. FIDLER

Introduction Metastasis, the spread of malignant tumor cells from a primary neoplasm to distant parts of the body where they multiply to form new growths, is a major cause of death from cancer. The treatment of cancer poses a major problem to clinical oncologists, because by the time many cancers are diagnosed, metastasis may already have occurred, and the presence of multiple metastases makes complete eradication by surgery, radiation, drugs, or biotherapy nearly impossible. Metastases can be located in different organs and in different locations within the same organ. These aspects significantly influence the response of tumor cells to therapy and the efficiency of anticancer drugs, which must be delivered to tumor lesions to destroy cells without leading to undesirable side effects. Similarly, immune effector cells of current biotherapeutic regimens may not reach or localize in metastases with different organs. Exacerbating the problems of treating metastatic disease is the fact that tumor cells in different metastases and in some instances even in different regions within a single metastasis may respond differently to treatment. Tumor cell resistance to current therapeutic modalities is the single most important reason for the lack success in treating many types of solid neoplasms. In part, the emergence of treatment-resistant tumor cells is due to the heterogeneous nature of malignant neoplasms. This diversity, which permits selected variants to develop from the parent tumor, implies not only that the primary tumor and metastases can differ in their response to treatment, but also that individual metastases can differ markedly from one another. Insight into the molecular mechanisms that regulate the pathogenesis of cancer metastasis as well as a better understanding of the interaction between metastatic cells and the host microenvironment should provide a foundation for the design of new therapeutic approaches. Moreover, the development of adequate models that allow for the isolation and characterization of cells possessing metastatic potential will be invaluable in the

R.K. Oldham and R.O. Dillman (eds.), Principles of Cancer Biotherapy, © Springer Science + Business Media B.V. 2009

design of more effective therapeutic modalities. In this chapter, we discuss the biology of cancer metastasis with special emphasis on recent data demonstrating that the microenvironment of different organs can influence the biological behavior of tumor cells at different steps of the metastatic process and the development of biologic diversity in malignant neoplasms. These findings have obvious implications for the therapy of neoplasms in general and metastases in particular.

The Pathogenesis of Cancer Metastasis The process of cancer metastasis is dynamic, complex and consists of multiple, sequential, and interrelated steps shown schematically in Fig. 1. To produce a clinically relevant lesion, metastatic cells must survive all the steps of the process. If the disseminating tumor cell fails to complete any one of these steps, it will fail to produce a metastasis. Thus, the successful metastatic cell has been likened to a decathlon champion who must be proficient in all ten events to be successful, not just a few [58]. The outcome of this process depends on both the intrinsic properties of the tumor cells and their interactions with host factors [48, 56, 57, 99]. The essential steps in the formation of a metastasis are: (1) After the initial transforming event, either unicellular or multicellular, growth of neoplastic cells must be progressive, with nutrients for the expanding tumor mass initially supplied by simple diffusion. (2) Extensive vascularization must occur if a tumor mass is to exceed 1–2 mm in diameter. The synthesis and secretion of proangiogenic angiogenesis factor probably plays a key role in establishing a neocapillary network from the surrounding host tissue. (3) Local invasion of the host stroma by some tumor cells could occur by several nonmutually exclusive mechanisms. (4) Thin-walled venules, like lymphatic channels, offer very little resistance to penetration by tumor cells and provide the most

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The pathogenesis of cancer metastasis: relevance to therapy

THE PATHOGENESIS OF A METASTASIS TRANSFORMATION

ANGIOGENESIS

MOTILITY & INVASION

Capillaries, Venules, lymphatic vessels

ARREST IN CAPILLARY BEDS

EMBOLISM & CIRCULATION

TRANSPORT

ADHERENCE

EXTRAVASATION INTO ORGAN PARENCHYMA

MULTICELL AGGREGATES (lymphocytes,platelets)

RESPONSE TO MICROENVIRONMENT

METASTASIS OF METASTASES TUMOR CELL PROLIFERATION & ANGIOGENESIS

METASTASES

Figure 1. The pathogenesis of cancer metastasis

common pathways for tumor cell entry into the circulation. Although clinical observations have suggested that carcinomas frequently metastasize and grow via the lymphatic system, whereas malignant tumors of mesenchymal origin more often spread by the hematogenous route, the presence of numerous venolymphatic anastomoses invalidates this concept. (5) Detachment and embolization of small tumor cell aggregates occurs next, the vast majority of circulating tumor cells being rapidly destroyed. (6) Once the tumor cells have survived the circulation, they must (7) arrest in the capillary beds of organs, either by adhering to capillary endothelial cells or by adhering to subendothelial basement membrane, which may be exposed. (8) Extravasation occurs next, probably by the same mechanisms that influence initial invasion. (9) Proliferation within the organ parenchyma completes the metastatic process (10). To continue

growing, the micrometastases must develop a vascular network and continue to evade the host immune system. Moreover, the cells can invade, penetrate blood vessels, and enter the circulation to produce additional metastases (Fig. 1).

NeovascularizationAngiogenesis Oxygen can diffuse from capillaries for only 150–200 μm. When distances of cells from a blood supply exceed this, cell death follows [80]. Thus, the expansion of tumor masses beyond 1 mm in diameter depends on neovascularization, i.e., angiogenesis [78, 79]. The formation of new vasculature consists of multiple, interdependent steps. It begins with local degradation of the basement

Sun-Jin Kim et al. membrane surrounding capillaries, followed by invasion of the surrounding stroma and migration of endothelial cells in the direction of the angiogenic stimulus. Proliferation of endothelial cells occurs at the leading edge of the migrating column, and the endothelial cells begin to organize into three-dimensional structures to form new capillary tubes. Differences in cellular composition, vascular permeability, blood vessel stability, and growth regulation distinguish vessels in neoplasms from those in normal tissue [1, 3, 79, 156]. The onset of angiogenesis involves a change in the local equilibrium between proangiogenic and antiangiogenic molecules [55]. Some of the common proangiogenic factors include bFGF, which induces the proliferation of a variety of cells and has also been shown to stimulate endothelial cells to migrate, to increase production of proteases, and to undergo morphogenesis [80]. Likewise, VEGF/VPF has been shown to induce the proliferation of endothelial cells, to increase vascular permeability, and to induce production of urokinase plasminogen activator by endothelial cells [46]. Additional proangiogenic factors include IL-8 [268], platelet-derived endothelial cell growth factor, which has been shown to stimulate endothelial cell DNA synthesis and to induce production of FGF, hepatocyte growth factor (HGF), or scatter factor, that increases endothelial cell migration, invasion, and the production of proteases, and platelet-derived growth factor (PDGF). The production of bFGF, VEGF, and IL-8 by tumor or host cells or the release of proangiogenic molecules from the extracellular matrix is known to induce the growth of endothelial cells and formation of blood vessels. Further, the organ microenvironment can directly contribute to the induction and maintenance of the proangiogenic factors bFGF [226, 227] and IL-8 [228]. The production of angiogenic molecules, e.g., VEGF, bFGF, and IL-8 by melanoma cells is regulated by complex interactions with keratinocytes in the skin [106]. Reports from our laboratory showed that IL-8 is an important molecule in melanoma growth and progression. Constitutive expression of IL-8 directly correlated with the metastatic potential of human melanoma cells. Further, IL-8 induced proliferation, migration, and invasion of endothelial cells and, hence, neovascularization [97]. Several organ-derived cytokines (produced by inflammatory cells) are known to induce expression of IL-8 in normal and transformed cells [106]. Since IL-8 expression in melanocytes and melanoma cells can be induced by inflammatory signals, the question of whether specific organ microenvironments could influence the expression of IL-8 was analyzed. Melanoma cells were implanted into the subcutis, the spleen (to produce liver metastasis),

19 and intravenously (to produce lung metastasis) of athymic nude mice. Subcutaneous tumors, lung lesions, and liver lesions expressed high, intermediate, and no IL-8, respectively, at both the mRNA and protein levels. Melanoma cells established from the tumors growing in vivo exhibited similar levels of IL-8 mRNA transcripts as continuously cultured cells, thus demonstrating that the differential expression of IL-8 was not due to the selection of a subpopulation of cells [97]. IL-8 expression can be upregulated by coculturing melanoma cells with keratinocytes (skin) and inhibited by coculturing melanoma cells with hepatocytes (liver). We also investigated the effects of two cytokines produced by keratinocytes (IL-1, IFN-β) and two cytokines produced by hepatocytes (TGF-α, TGF-β) on the regulation of IL-8 in human melanoma cells. IL-1 upregulated the expression of IL-8 in human melanoma cells at both the mRNA and protein levels in a dose- and timedependent manner in the presence of de novo protein synthesis. IFN-β did not affect constitutive IL-8 mRNA and protein production in human melanoma cells, but it did block the induction of IL-8 by IL-1. TGF-β inhibited the expression of IL-8, while TGF-α had no effect on IL-8 expression [226]. Patients with renal cell carcinoma exhibit high levels of bFGF in the serum or the urine that inversely correlates with survival [181, 184]. Human renal cancer cells implanted into the kidney of nude mice were highly metastatic to the lung, whereas renal cancer cells implanted subcutaneously remain local [227]. The subcutaneous or intramuscular tumors expressed a lower level of mRNA transcripts for bFGF than did tumor cells growing in culture, whereas the renal tumors had 20 times higher levels of bFGF mRNA and protein levels as compared with the cultured cells. A histopathologic examination of the tumors demonstrated that the subcutaneous tumors had few blood vessels, whereas the renal tumors had many [227, 228]. Direct correlation between the level of bFGF and advanced disease was also reported for patients diagnosed with colon carcinoma. Patients with Duke’s C or D tumors had markedly higher levels of bFGF in the blood than patients with Duke’s B. In situ hybridization analysis revealed that bFGF was overexpressed at the tumor periphery associated with cell division. Northern blot analysis detected no mRNA transcripts for bFGF [129]. In a follow-up study of patients with colon cancer, bFGF expression was found to be highest in the primary tumors of patients who presented with metastatic disease and therefore identify a cohort of patients who appeared to be free of metastatic disease at the time of surgery (low bFGF expression) as compared to another cohort of patients who did develop metastatic disease (high bFGF) [130].

20

Tumor Cell Invasion To reach blood vessels or lymphatics, tumor cells must penetrate host stroma that includes basement membrane. The interaction with the basement membrane consists of attachment, matrix dissolution, motility and penetration [154]. At least three nonmutually excluding mechanisms can be involved in tumor cell invasion of tissues. First, mechanical pressure produced by rapidly proliferating neoplasms may force cords of tumor cells along tissue planes of least resistance [154, 155]. Second, increased cell motility can contribute to tumor cell invasion. Most tumor cells possess the necessary cytoplasmic machinery for active locomotion and increased tumor cell motility is preceded by a loss of cell-to-cell cohesive forces. In epithelial cells, the loss of cell-to-cell contact is associated with downregulation of the expression of E-cadherin, a cell surface glycoprotein involved in calcium-dependent homotypic cell-to-cell cohesion. Reduced levels of E-cadherin are associated with a decrease in cellular/ tissue differentiation and increased grade in carcinomas [120]. Many differentiated carcinomas express higher levels of E-cadherin mRNA, as do adjacent normal epithelial cells, whereas poorly differentiated carcinomas do not. Mutations in the E-cadherin gene and abnormalities of α-catenin, which is an E-cadherin-associated protein, have been associated with the transition of cells from the noninvasive to the invasive phenotype [261]. Third, invasive tumor cells secrete enzymes capable of degrading basement membranes, which constitute a barrier between epithelial cells and the stroma. Epithelial cells and stromal cells produce a complex mixture of collagens, proteoglycans, and other molecules, which contains ligands for adhesion receptors and is permeable to molecules but not to cells [230]. To invade the basement membrane, a tumor cell must first attach to extracellular matrix (ECM) components by a receptor-ligand interaction. One group of such cell surface receptors are the integrins which specifically bind cells to laminin, collagen, or fibronectin [218]. Many integrins that bind to different components of the ECM are expressed on the surface of human carcinoma cells. Tumor progression has been associated with a gradual decrease of integrin expression suggesting that the loss of integrins, coupled with the loss of E-cadherin, may facilitate detachment from a primary neoplasm. Subsequent to binding, tumor cells can degrade connective-tissue ECM and basement membrane components [177]. The production of enzymes such as type IV collagenase (gelatinase, matrix metalloproteinase) and heparinase in metastatic tumor cells correlates with invasive capacity of human carcinoma cells. Type IV collagenolytic

The pathogenesis of cancer metastasis: relevance to therapy metalloproteinases with apparent molecular masses of 98, 92, 80, 68, and 64-kDa have been detected in highly metastatic cells. Poorly metastatic cells, on the other hand, appear to secrete very low amounts of only the 92-kDa metalloproteinase [171, 172].

Lymphatic Metastasis Early clinical observations led to the impression that carcinomas spread mainly by the lymphatic route and mesenchymal tumors spread mainly by means of the bloodstream. We now know, however, that the lymphatic and vascular systems have numerous connections and that disseminating tumor cells may pass from one system to the other [27]. For these reasons, the division of metastasis into lymphatic spread and hematogenous spread is arbitrary. During invasion, tumor cells can easily penetrate small lymphatic vessels and be passively transported in the lymph. Tumor emboli may be trapped in the first lymph node encountered on their route, or they may bypass regional draining lymph nodes to form distant nodal metastases (“skip metastasis”). Although this phenomenon was recognized in the late 1800s [193], its implications for treatment were frequently ignored in the development of surgical approaches to treat cancers [263, 264]. Regional lymph nodes (RLN) in the area of a primary neoplasm may become enlarged as a result of hyperplasia or growth of tumor cells in the node. Although the use of morphologic criteria for assessing prognoses based on lymph node appearance is debatable, lymphocytedepleted lymph nodes are believed to indicate a less favorable prognosis than those demonstrating reactive morphologic characteristics [16]. Hyperplastic responses could indicate reactivity to autochthonous tumors, and this could benefit the host. Whether the RLN can retain tumor cells and serve as a temporary barrier for cell dissemination is controversial. In most experimental animal systems used to investigate this question, normal lymph nodes were subjected to a sudden challenge with a large number of tumor cells, a situation that may not be analogous to RLN at the early stages of cancer spread in humans, when small numbers of cancer cells continuously enter the lymphatics. This issue is important because of practical considerations for surgical management of such neoplasms as cutaneous melanoma. It raises the question, is elective prophylactic lymph node dissection appropriate for the treatment of micrometastases? The biologic justification for elective lymph node dissection in patients with melanoma presumes that metastasis of some cutaneous melanomas

Sun-Jin Kim et al. occurs first in the RLN, and that only at a later time do tumor cells gain access to the circulation to reach distant organs. If this is the case, and RLN can act as a temporary barrier to the spread of cancer, removing the RLN with micrometastases could clearly increase the cure rate in subgroups of patients with melanoma. Some evidence exists that patients with melanomas of intermediate thickness (1–4 mm) do in fact have an improved survival rate subsequent to elective lymph node dissection. Similarly, some data suggest that an improved survival rate can be achieved for selected patients with head and neck cancers by elective lymph node dissection or local treatment with x-irradiation [25]. Recent advances in mapping of the lymphatics draining cutaneous melanoma (by the use of dyes or radioactive tracers) have allowed surgeons to identify the lymph node draining the tumor site (i.e., the sentinel lymph node) [36]. The presence of melanoma micrometastases in sentinel lymph nodes is correlated with poor prognosis and hence indicates wide field dissection. A series of more than 500 melanoma cases with longer than 4 years’ median clinical follow-up concluded that absence of disease in sentinel lymph node correlates with increased disease-free status (in other nodes) and few or no skip metastases [119, 175]. These data suggest that elective lymph node dissection when metastatic cells are present in sentinel lymph nodes produces beneficial results in patients with melanoma.

Hematogenous Metastasis During blood-borne metastasis, tumor cells must survive transport in the circulation, adhere to small blood vessels or capillaries, and invade the vessel wall. The mere presence of tumor cells in the circulation does not in itself constitute metastasis, since most cells released into the bloodstream are eliminated rapidly [60, 263, 264]. Using radiolabeled tumor cells, we found that by 24 h after entry into the circulation, less than 1% of the cells are still viable, and less than 0.1% of tumor cells placed into the circulation eventually survive to produce metastases [60]. Although most tumor cells are destroyed in the bloodstream, it seems that the greater the number of cells released by a primary tumor, the greater the probability that some cells will survive to form metastases. The number of tumor emboli in the circulation appears to correlate well with the size and clinical duration of the primary tumor, and the development of necrotic and hemorrhagic areas in large tumors facilitates this process by providing tumor cells easy access to the circulation [263].

21 To a large degree, the rapid death of most circulating tumor cells is probably due to such simple mechanical factors as blood turbulence. Tumor cell survival can be increased by aggregation. Tumor cells can aggregate with each other or with host cells, such as platelets and lymphocytes [67]. Once metastatic cells reach the microcirculation, they interact with cells of the vascular endothelium. These interactions include nonspecific mechanical lodgment of tumor cell emboli as well as formation of stable adhesions between tumor cells and small-vessel endothelial cells. The organ distribution of metastatic foci is believed to depend, in part, on the ability of blood-borne malignant cells to adhere to specific endothelium and produce endothelial cell retraction [185, 186]. The formation of fibrin clots at sites of tumor cell arrest in the microcirculation can result in blood vessel damage [45, 46]. In some tumor systems, fibrin formation is not essential for tumor cell implantation or metastasis formation. The increased coagulability often observed in patients with cancer may be related to the high levels of thromboplastin found in certain tumors or to production of high levels of procoagulant-A activity, which can directly activate factor X in the clotting process. Since reduced blood flow could lead to increased trapping of circulating tumor cells and perhaps to their increased survival, the use of anticoagulants in the treatment or control of metastasis has been tried, albeit to a limited success. The adhesion of tumor cells to the vascular endothelium is regulated by mechanisms similar to those used by leukocytes. The initial attachment of leukocytes to vascular endothelial cells is regulated by the selectin family of adhesion molecules which consists of three closely related cell surface molecules. E-selectin, which is expressed by endothelial cells, mediates initial attachment of lymphocytes (and tumor cells) by interaction with specific carbohydrate ligands that contain sialylated fucosylated lactosamines. The expression of mucin-type carbohydrates on the surface of human colon carcinoma has been correlated with their metastatic potential [161], perhaps through differential interaction with E-selectins expressed on specific endothelial cells. The development of firm adhesion requires the interaction of other adhesion molecules, another selective process in metastasis. Several classes of cell-to-cell adhesion molecules regulate this adhesion. These include the hyaluronate receptor CD44 and its splice-variants [183], the integrins α5β1, α6β1, and α6β4, and the galactoside-binding galectin-3 [218]. The arrest of tumor cells in capillary beds leads to the retraction of endothelial cells and the exposure of the tumor cells to the ECM. The adhesion of metastatic cells

22 to components of the ECM, such as fibronectin, laminin, and thrombospondin, facilitates metastasis to specific tissues, and peptides containing sequences of these components of the ECM can reduce formation of hematogenous metastases [246]. Extravasation of arrested tumor cells is believed to operate by mechanisms similar to those responsible for local invasion. Tumor cells can grow and destroy the surrounding vessel, invade by penetrating the endothelial basement membrane, or they can follow migrating white blood cells [50]. The ability of malignant cells to extravasate into surrounding tissues of particular organs seems to arise, in part, from their selective adherence to and invasion of certain tissues [187]. Malignant cells frequently penetrate thin-walled capillaries but rarely invade arteries or arteriole walls, which are rich in elastin fibers. This resistance to invasion is not necessarily mediated by mechanical strength alone. Connective tissues have been shown to produce protease inhibitors, and these may block enzyme-dependent processes of invasion. The invasion, survival, and growth of malignant cells at particular secondary sites also involve their responses to tissue or organ factors. Tumor cells can recognize tissue-specific motility factors that direct their movement and invasion [196]. After tumor cells invade organ parenchyma, they must also respond to organ-specific factors that influence their growth [187].

Metastasis of Metastases The tumor cells proliferating within metastases can invade host stroma, penetrate blood vessels, and enter the circulation to produce secondary metastases, the so-called “metastasis of metastases” [73, 235, 236]. Hart and Fidler used the preferential growth of B16 melanoma metastases in specific organs. Following the intravenous injection of B16 melanoma cells into syngeneic mice, tumor growths developed in the lungs and in fragments of lung or ovarian tissue implanted intramuscularly into the quadriceps femoris but not in renal tissue implanted as a control [101]. Tumor growth in the specific transplanted organ could have been caused by the arrest and growth of tumor cells immediately following intravenous injection, i.e., “initial metastases.” Alternatively, tumor cells injected intravenously could have been arrested in the lungs, where they developed; once metastases were established, tumor cells could enter the circulation to be arrested at other organs and produce “secondary metastases” [235]. To distinguish between these possibilities, Nicolson and Fidler performed

The pathogenesis of cancer metastasis: relevance to therapy several experiments [73]: Two weeks after normal, tumor-free mice were joined parabiotically to metastasisbearing animals, there was no evidence of any tumor growth in the “guest” animals. However, when the parabiont animals were allowed to survive for 4 weeks after separation from the metastasis-bearing animals, 40% developed lung metastases. Since the host mice did not have primary tumors at the time of parabiosis, the metastases in the guest mice could have only arisen as metastasis from metastases [101].

The Biologic and Metastatic Heterogeneity of Neoplasms Only a few tumor cells that enter the circulation can produce metastases. In fact, since less than 0.01% of circulating cells are likely to produce a secondary growth, the development of metastases could represent the fortuitous survival of a few tumor cells or the selection from the parent tumor of a subpopulation of metastatic cells endowed with properties that enhance their survival [65, 66, 71]. Data generated by our research group and many others prove that neoplasms are biologically heterogeneous and that metastasis is indeed a selective process. The first experimental proof of metastatic heterogeneity of neoplasms was provided by Fidler and Kripke in 1977 working with the murine B16 melanoma [71]. Using the modified fluctuation assay of Luria and Delbruck [157], they showed that different tumor cell clones, each derived from an individual cell isolated from the parent tumor, varied dramatically in their ability to produce pulmonary nodules after intravenous inoculation into syngeneic recipient mice. Control subcloning procedures demonstrated that the observed diversity was not a consequence of the cloning procedure [71]. The finding that preexisting tumor cell subpopulations proliferating in the same tumor exhibit heterogeneous metastatic potential has since been confirmed in many laboratories with a wide range of experimental animal tumors of different histories and histologic origins [reviewed in 58, 63, 64, 208, 209]. In addition, studies using young nude mice as models for metastasis of human neoplasms have shown that several human tumor lines and freshly isolated tumors such as colon carcinoma, renal carcinoma, and prostate cancer also contain subpopulations of cells with widely differing metastatic properties [64]. We studied the biologic and metastatic heterogeneity in a mouse melanoma induced in C3H mice by chronic exposure to ultraviolet B radiation and painting with

Sun-Jin Kim et al. croton oil [134, 135]. One mouse thus treated developed a melanoma designated by Kripke as K-1735 [134]. The original K-1735 melanoma was established in culture and immediately cloned [69]. In an experiment similar in design to the one described for the B16 melanoma, the clones differed greatly from each other and from the parent tumor in their ability to produce lung metastases. In addition to differences in number of metastases, we also found significant variability in the size and pigmentation of the metastases. Metastases to the brain, heart, liver and skin were found as well; those growing in the brain were uniformly pigmented, whereas those growing in the lymph nodes, heart, liver, or skin generally had no pigment. To determine whether the absence of metastasis production by some (but not all) clones of the K-1735 was a consequence of their immunologic rejection by the normal host [134–136], we examined their metastatic behavior in young nude mice. In addition to the lack of a functional T-cell system, unstressed 3-week-old nude mice are also deficient in natural killer cell activity. In such recipients, the immunologic barrier to metastatic cells that also may be highly immunogenic is removed, and they may thus successfully complete the process. This was true for cells of two clones that did not produce metastases in normal syngeneic mice but produced tumor foci in the young nude recipients. Most of the nonmetastatic clones were nonmetastatic in both normal syngeneic and in the nude recipients. Therefore, the clones’ failure to metastasize in syngeneic mice probably was not caused by their immunologic rejection by the host but by their inability to complete one or another step in the complex metastatic process.

Enhanced Metastatic Potential of Tumor Cells Harvested from Metastases Our studies and most data reported by others have led us to conclude that metastasis is a highly selective process regulated by a number of as yet imperfectly understood mechanisms. This belief is contrary to the once widely accepted notion that neoplastic dissemination is the ultimate expression of cellular anarchy. In fact, suggesting that cancer metastasis is a selective process is a more optimistic view in terms of cancer therapy than one that postulates that tumor dissemination is an entirely random event. Belief that certain rules govern the spread of neoplastic disease implies that elucidation and understanding of these rules will lead to better therapeutic interventions.

23 We addressed the question of whether the cells that survive to form metastases possess a greater metastatic capacity than most cells in the parent neoplasm [243]. Some support for this possibility comes from the initial in vivo selection experiments of the highly metastatic B16-F10 cell line derived from the parent B16 melanoma [66]. Comparable results have been obtained with the K-1735 tumor. When cells derived from the parent tumor were injected intramuscularly into the hind foot pads of syngeneic mice, the resulting skin tumors produced spontaneous pulmonary metastases. Four cell lines were established from four individual lung nodules harvested from four different mice. The finding that all the lines derived from metastatic deposits produced significantly more metastases than cells of the parent line was good evidence for the hypothesis that metastasis is a selective process, that is, cells populating metastases have an increased metastatic capacity [243]. Our studies demonstrate that the K-1735 melanoma is heterogeneous and contains both nonmetastatic and metastatic cells. In contrast, individual metastases (spontaneous pulmonary metastases) are more uniform. This suggests that metastatic foci could develop by a clonal expansion of a few surviving metastatic cells. Moreover, it explains the observations showing that tumor cells in primary and metastatic lesions differ in their antigenic properties, biochemical characteristics, and response to cytotoxic drugs [reviewed in 61–63].

Clonal Origin of Cancer Metastases Multiple metastases proliferating in a host, even in the same organ, often exhibit diverse biological characteristics of, for example, hormone receptors, antigenicity or immunogenicity, and response to various chemotherapeutic agents. This diversity may result from the nature of the pathogenesis of metastasis, the process of tumor evolution and progression, or both. Pathologists have long been aware that neoplasms frequently exhibit different morphological appearances in different areas. For this reason, the malignant or benign nature of a tumor cannot be determined with confidence unless multiple sections obtained from all parts of the tumor are examined. The zonal differences in tumors are not restricted to morphology alone but include biological characteristics such as growth rates, sensitivity to cytotoxic drugs, antigenicity, and pigmentation [74]. Since primary tumors are not uniform, it is possible that tumor cell aggregates entering the circulation from one

24 zone of the tumor may be different from those entering from another zone. If an embolic aggregate originates from a primary tumor’s homogeneous zone, regardless of whether only one cell or several cells survived to proliferate in distant organs, the resulting metastasis would be like a primary tumor of unicellular origin. If a mixed embolus derived from an area of zonal junctions enters the circulation, the unicellular or multicellular origin of the metastasis would depend on whether a single cell or multiple cells survived to proliferate. To determine whether individual metastases are clonal and whether different metastases can be produced by different progenitor cells, Talmadge et al. [244] performed a series of experiments using the fact that x-irradiation of tumor cells induces random chromosome breaks and rearrangements. Analyzing the karyotype composition of 21 individual melanoma lung metastases after cultivating cells from individual lesions, this research group found unique karyotypic patterns of abnormal, marker chromosomes in most of the lines established from metastases, which suggested that each metastasis originated from a single progenitor cell. Similar results have been obtained in other rodent tumor systems. These studies revealed that the majority of metastases are of clonal origin. Moreover, variant clones with diverse phenotypes are formed, rapidly resulting in the generation of significant cellular diversity within individual metastases [244]. Cancer metastases of a clonal origin can be produced by two different mechanisms, proliferation of a single cell or of many cells. In the case of the second possibility, the cell aggregate at the metastatic site must have a homogeneous composition. To determine which of these possibilities is responsible for the generation of clonal K-1735 melanoma metastases, we injected C3H mice intravenously with aggregates of K-1735 cells consisting of two distinct subpopulations [75]. Cells of line K-1735-M2 are highly metastatic and exhibit a stable normal karyotype. Cells of the X-met-21 line are also highly metastatic but exhibit a stable, submetacentric chromosomal marker. After mixed aggregates (>20 cells) of these two cell types were injected, individual lung metastases were recovered and cultured, and each metastatic line was subjected to chromosome analysis. We reasoned that if an experimental metastasis originated from a single proliferating cell, all tumor cells within the metastatic focus should express either the K-1735-M2 or the X-met-21 chromosomal profile. This indeed was the case. Analysis of the distribution and fate of circulating tumor emboli has demonstrated that multicellular aggregates are more likely to give rise to a metastasis than a single-tumor-cell embolus. This is probably so because tumor cells not on the periphery of circulating emboli

The pathogenesis of cancer metastasis: relevance to therapy can be protected from destruction in the circulation, and a large aggregate of cells can more readily arrest in the capillary bed of an organ. Since the aggregates we injected were large, each containing more than 20 cells, the results suggest that the melanoma lung metastases resulted from the proliferation of a single viable cell within the embolus. Thus, regardless of whether an embolus is initially homogeneous or heterogeneous, metastases can be unicellular in origin. Collectively, these observations indicate that different metastases arise from different progenitor cells and account for the well-documented differences in behavior of different metastases. Among individual metastases of proved clonal origins, however, heterogeneity can develop rapidly to create significant intralesional heterogeneity.

Development of Biological Diversity within and Among Metastases Clinical and histologic observations of neoplasms have suggested that tumors undergo a series of changes during the course of the disease. A tumor initially diagnosed as benign, for example, can evolve over a period of many months into a malignant tumor. This can best be demonstrated in the case of human cutaneous melanoma where the transformation of normal melanocytes and their conversion into metastatic cells has been studied in detail by Clark and coworkers [32, 33]. This progression is gradual and consists of a series of discrete irreversible steps [107]. To explain the process of tumor evolution and progression as originally defined by Foulds in 1954 [81], Nowell [190] suggested that acquired genetic variability within developing clones of tumors, coupled with host selection pressures, can result in the emergence of new tumor cell variants that exhibit increasing growth autonomy or malignancy. Nowell’s hypothesis [190] predicted that accelerating tumor progression toward malignancy can be accompanied by increasing genetic instability of the evolving cells. To test this hypothesis, we have examined the metastatic stability and rates of mutation of paired metastatic and nonmetastatic cloned lines isolated from four different mouse neoplasms. We found that highly metastatic cells were phenotypically less stable than their nonmetastatic counterparts. Moreover, in highly metastatic clones, the rate of spontaneous mutation was found to be severalfold higher than in low-metastatic clones. These results are in accord with the hypothesis that tumor progression occurs as a result of acquired genetic alterations.

Sun-Jin Kim et al. Similar data have been reported for other neoplasms [reviewed in 62, 65]. Evidence that genetic mechanisms can be responsible for tumor progression comes from mutagenesis experiments using nitrosoguanidine. The finding that metastatic cells exhibit higher mutation rates than nonmetastatic cells [31], and that heterogeneity develops more rapidly in tumors containing few subpopulations of cells [186, 208, 210] suggest that accelerated tumor evolution and progression will result in the rapid development of biologic diversity in metastases, especially when such lesions are of clonal origin.

Intratumoral Heterogeneity for Expression of Tyrosine Kinase Growth Factor Receptors It is well recognized that tumor progression, angiogenesis, and metastasis are regulated by the interaction of tumor cells with the host organ microenvironment [70]. The expression of growth factors and their receptors varies within different zones of any given organ and may also differ among different cells within a tumor [62, 63]. Overexpression of transforming growth factor-alpha (TGF-α), epidermal growth factor (EGF), and the EGF receptor (EGFR) has been reported to be associated with poor prognosis in different neoplasms [2, 111, 170, 253, 271]. Expression of vascular endothelial growth factor (VEGF) is associated with increased vascular permeability, cell proliferation, and survival of endothelial cells [85, 86, 148, 272]. The expression of VEGF has also been correlated with microvessel density of neoplasms [52, 242] metastasis, and, hence, poor prognosis [53, 116, 140, 234, 262]. The expression of PDGF and its receptor (PDGFR) by tumor cells, tumor-associated endothelial cells [126, 251], and pericytes and myofibroblasts [127, 131, 151, 269, 270] is common to many neoplasms. In clinical specimens of human colon carcinomas, while PDGF is produced by tumor cells, the expression of PDGFR is restricted to stromal cells, including tumorassociated endothelial cells [131], i.e., tumor-associated stromal cells generate a microenvironment favorable to the survival and progressive growth of tumor cells [213]. Specifically, PDGFR signaling is related to recruitment of pericytes and control of interstitial fluid pressure [14, 192, 202, 213], which are favorable to the survival and progressive growth of neoplasms [155]. The expression of TGF-α, EGF, VEGF, and PDGF-β and their respective receptors was examined in 12 human colon cancer surgical specimens and in orthotopic tumors in nude mice produced by two distinct human colon

25 carcinoma cell lines. Inter- and intratumoral heterogeneity in expression of these growth factors and their receptors was reported. Different proteins produced by tumor cells can regulate the interaction between tumor cells and the organ microenvironment [57]. Many protein tyrosine kinase receptors on tumor cells and tumor-associated endothelial cells can be induced or upregulated by ligands produced by tumor cells via autocrine and paracrine pathways [55]. In many clinical trials, the presence of targets in patients was not confirmed, and the response rate was unpredictable [247]. For inhibition of phosphorylated EGFR, the presence of mutated receptors was reported to be a predictable variable [158], but significant therapeutic responses of cancer cells with wild-type receptors has also been reported [23, 269, 270]. These confusing criteria for selection of patients for treatment strongly indicate the need for better methodologies. The data demonstrating inter- and intratumoral heterogeneity for expression of EGFR, VEGFR2, and PDGFR-β in different human colon cancer specimens of different stages suggest that targeting a single tyrosine kinase receptor is not likely to provide significant therapeutic results. In other words, targeted therapy is effective only against its target and eliminating tumor cells that are dependent on one pathway, e.g., EGFR, is not likely to prevent the proliferation of tumor cells that are independent of this pathway. These results agree with a recent report demonstrating biological heterogeneity of tyrosine kinase receptors in other cancers [30, 173]. Indeed, simultaneous blocking of two protein tyrosine kinase pathways produce more efficient therapeutic effects in prostate [128] and pancreatic [269] carcinoma than did blocking of a single such pathway. Therapeutic efficacy was further increased when three protein tyrosine kinase pathways were inhibited [270]. Cancers are biologically heterogeneous for multiple properties, including antigenicity, sensitivity to chemotherapeutic agents, invasion, and metastasis [76, 77]. The progressive growth, metastasis, and survival of tumor cells depend on their interaction with the organ microenvironment. The expression of multiple tyrosine kinase receptors by different tumor cells within a single neoplasm indicates that targeting a single tyrosine kinase may not produce eradication of the disease.

Zonal Heterogeneity for Gene Expression A better understanding of the cross-talk between cancer cells and the organ microenvironment involving multiple genes first requires the identification of gene expression

26 profiles within the tumor. Among current methods for establishing these profiles, microarray analysis is the most powerful, and several such studies have been undertaken to predict disease outcome for individual patients [9, 10, 29, 115, 207, 216, 258, 259] and to identify cancer patients who should receive chemotherapy [17]. For example, pretherapeutic gene expression profiling has been undertaken to identify breast cancer patients who should receive specific chemotherapy [17], to predict response of rectal cancer patients to preoperative chemoradiotherapy [89], and to predict response of breast cancer patients to docetaxel [28], and a specific gene expression pattern was correlated with recurrence in Dukes’ B colon carcinomas [265]. None of these studies, however, accounted for the biologic heterogeneity of gene expression within a single tumor. Tumor cells depend on multiple and redundant pathways for growth, survival, and adaptation to the host microenvironment [70, 76, 77, 155]. In malignant neoplasms, genetic instability of cancer cells frequently yields extensive intratumoral heterogeneity in the pattern of structural chromosome aberrations [90, 92, 93, 95]. Three dimensional tumor growth and uneven fractional division of tumor cells within a single tumor mass can give rise to biologically different central and peripheral zones. The microenvironment of the central zone differs significantly from that of the peripheral zone, and zonal heterogeneity for several molecules in different tumor systems has been reported [102, 105, 129, 130, 138, 139, 191, 225]. Among these, bFGF, matrix metalloproteinase-2 (MMP-2), and MMP-9 have been shown to be highly expressed at the invasive edge of tumors [105, 130, 131, 138, 139], whereas the cell-to-cell cohesion molecule, E-cadherin, was downregulated at the periphery of the tumors [105, 130, 131, 138, 139, 191]. In fact, the ratio of expression of MMP-2 and MMP-9 to E-cadherin (MMP/E-cadherin ratio) at the periphery of the tumors correlated with metastatic potential and recurrent disease [138, 139]. Affymetrix HG-U133-Plus 2.0 array and laser capture microdissection techniques, demonstrated that different zones of the same pancreatic tumor exhibit differential expression of genes [179, 180]. The study of 1,222 genes demonstrated statistically significant differences. Bioinformatic functional analysis revealed that 346 upregulated genes in the peripheral zone were related to cytoskeleton organization and biogenesis, cell cycle, cell adhesion, cell motility, DNA replication, localization, integrinmediated signaling pathway, development, morphogenesis, and IκB kinase/NF-κB cascade. In the central zone, 876 upregulated genes were related to the regulation of cell proliferation, transcription, transmembrane

The pathogenesis of cancer metastasis: relevance to therapy receptor protein tyrosine kinase signaling pathways, response to stress, small GTPase-mediated signal transduction, hexose metabolism, cell death, response to external stimulus, and carbohydrate metabolism. These data clearly demonstrate zonal heterogeneity for gene expression profiles within single tumors and suggest that characterization of zonal gene expression profiles is essential if microarray analyses of genetic profiles are to produce reproducible data, predict disease prognosis, and allow design of specific therapeutics [179, 180].

Tumor-Organ Interaction: The “Seed and Soil” Hypothesis Clinical observations of cancer patients and studies with experimental rodent tumors have led cancer biologists to conclude that the metastatic pattern of certain tumors is organ-specific and independent of vascular anatomy, rate of blood flow, and number of tumor cells delivered to each organ [reviewed in 62, 65, 263, 264]. Indeed, the distribution and fate of hematogenously disseminated, radiolabeled melanoma cells in experimental animals conclusively demonstrated that tumor cells can reach the microvasculature of many organs, but growth in the organ parenchyma occurs in only specific organs [60]. These findings, however, were not new. More than 100 years earlier, Paget reached a similar conclusion. In 1889, he asked, “What is it that decides what organs shall suffer in a case of disseminated cancer?” Paget’s study was motivated by the discrepancy between considerations of blood flow and the frequency of metastases in different organs. He examined the autopsy records of 735 women who died of breast cancer and many other patients with different neoplasms and noticed the high frequency of breast cancer metastasis to the ovaries and the variations in incidence of skeletal metastases produced by different primary tumors. These findings were not compatible with the view that metastatic spread was due to “a matter of chance” or that tissues “played a passive role” in the process. Paget [193] concluded that metastasis occurred only when certain favored tumor cells (the “seed”) had a special affinity for the growth milieu provided by certain specific organs (the “soil”). The formation of metastasis required the interaction of the right cells with the compatible organ environment. In 1928, Ewing [50] challenged Paget’s seed and soil theory and hypothesized that metastatic dissemination occurs purely by mechanical factors that are a result of the anatomical structure of the vascular system. Both of these explanations have been evoked separately or

Sun-Jin Kim et al. together in order to explain the metastatic site preference of certain types of neoplasms. In a review of clinical studies on site preferences of metastases produced by different human neoplasms, Sugarbaker [235] concluded that common regional metastatic involvements could be attributed to anatomical or mechanical considerations, such as efferent venous circulation or lymphatic drainage to regional lymph nodes, but that metastasis in distant organs from numerous types of cancers were indeed sitespecific. Experimental data supporting Paget’s 1889 seed and soil hypothesis were provided a century later by Hart and Fidler [101], who studied the preferential growth of B16 melanoma metastases in specific organs. Following the intravenous (i.v.) injection of B16 melanoma cells into syngeneic C57BL/6 mice, tumor growths developed in the natural lungs and in grafts of pulmonary or ovarian tissue implanted either subcutaneously (s.c.) or intramuscularly (i.m.). In contrast, neoplastic lesions failed to develop in control grafts of similarly implanted renal tissue or at the site of surgical trauma. Parabiosis experiments suggested that the growth of the B16 melanoma in ectopic lung or ovarian tissue was due to the immediate arrest of circulating neoplastic cells and not to shedding of malignant cells from foci growing in the natural lungs. Quantitative analysis of tumor cell arrest and distribution using cells labeled with [125I]-5-iodo-2´-deoxyuridine indicated that the growth of tumors in the implanted organs was not due to an enhanced initial arrest of B16 cells. No significant differences in immediate tumor cell arrest were detected between implanted fragments of lungs (tumorpositive) and kidney (tumor-negative) or between organbearing and contralateral control limbs. These data demonstrated that the outcome of metastasis is dependent on both tumor cell properties and host factors and supported the seed and soil hypothesis as an explanation of the nonrandom pattern of cancer metastasis. The introduction of peritoneovenous shunts for palliation of malignant ascites provided an opportunity to study some of the factors affecting metastatic spread in humans. Tarin et al. [245] described the outcome in patients with malignant ascites draining into the venous circulation, with the resulting entry of viable tumor cells into the jugular veins. Good palliation with minimal complications was reported for 29 patients with various neoplasms. The autopsy findings in 15 patients substantiated the clinical observations that the shunts did not significantly increase the risk of metastasis. In fact, despite continuous entry of millions of tumor cells into the circulation, metastases in the lung (the first capillary bed encountered) were rare. These results provide compelling verification of the seed and soil hypothesis.

27 A clear demonstration of organ-site specific metastasis comes from studies of experimental brain metastasis. Two murine melanomas were injected into the carotid artery to simulate the hematogenous spread of tumor emboli to the brain. The K-1735 melanoma generated lesions only in the brain parenchyma, whereas the B16 melanoma produced only meningeal growths [219]. Similarly, different human melanomas [220] injected into the internal carotid artery of nude mice also produced unique patterns of brain metastasis. Distribution analysis of radiolabeled melanoma cells injected into the internal carotid artery ruled out the possibility that the patterns of initial cell arrest in the microvasculature of the brain predicted the eventual sites of growth. Rather, the different sites of tumor growth in the brain involved interactions between the metastatic cells and brain endothelial cells, and the response of tumor cells to local growth factors. In other words, site-specific metastases were produced by tumor cells that are receptive to their new environment.

Regulation of Tumor Cell Gene Expression by the Organ Microenvironment Tumor cells with different metastatic capabilities have been shown to differ in expression of proteins, such as collagenases, E-cadherin, IL-8, bFGF, and many others [65]. In most cases, however, these differential expressions were most evident in tumor cells growing at anatomically correct sites. Many biologic investigations of solid tumor cells often use cell lines growing in vitro as monolayer cultures. While easy to accomplish, monolayer cultures are not subjected to any cross talk, e.g., paracrine signaling pathways associated with growth in vivo [37]. Clinical observations of cancer patients and studies in rodent models of cancers have concluded that certain tumors tend to metastasize to certain organs [264]. The concept that metastasis results only when certain tumor cells interact with a specific organ microenvironment was originally proposed in Paget’s venerable “seed and soil” hypothesis [193]. Indeed, spontaneous metastasis is produced by tumors growing at orthotopic sites, whereas the same tumor cells implanted into ectopic sites fail to produce metastasis [124]. To determine the influence of the microenvironment on changes in gene expression, microarray analyses were done on three variant lines of a human pancreatic cancer with different metastatic potentials [141, 179].

28 The variant lines were grown in tissue culture in the subcutis (ectopic) or pancreas (orthotopic) of nude mice. Compared with tissue culture, the number of genes whose expression was affected by the microenvironment was upregulated in tumors growing in the subcutis and pancreas. In addition, highly metastatic pancreatic carcinoma cells growing in the pancreas expressed significantly higher levels of 226 genes than did the low metastatic variant cells. Growth of the tumor cells in the subcutis did not yield similar results, indicating that the orthotopic microenvironment significantly influences gene expression in pancreatic cancer cells [141, 179].

Regulation of the Invasive Phenotype by the Microenvironment The metastatic capacity of human colon cancer cells growing in orthotopic tissues of nude mice directly correlates with the level of collagenase type IV activity [233]. Histological examination of the human colon carcinomas growing in the subcutis, wall of the colon, or kidney of nude mice revealed a thick pseudocapsule around the subcutaneous but not cecal or kidney tumors [61, 70, 76]. These differences suggested that the organ environment could influence the ability of metastatic cells to invade host stroma. Significant differences were found in the levels of secreted type IV collagenases between human colon cancer cells growing subcutaneously or in the cecum of nude mice. In the medium conditioned by human colon cancer cells derived from subcutaneous implants, we detected only a latent form of the 92-kDa type IV collagenase. In contrast, both latent and active forms of the 92-kDa type IV collagenase were found in culture medium conditioned by tumor cells harvested from cecal tumors. Moreover, cancer cells grown in the cecum secreted more than twice as much enzymes as the subcutaneous tumors [178]. The invasive ability of human colon cancer cells is directly influenced by organ-specific fibroblasts. Primary cultures of nude mouse fibroblasts from skin, lung, and colon were established, and invasive and metastatic human colon cancer cells were cultured alone or with the fibroblasts. The cancer cells grew on monolayers of all three fibroblast cultures but did not invade through skin fibroblasts [51]. Cancer cells growing on plastic and on colon or lung fibroblasts produced significant levels of latent and active forms of type IV collagenase, whereas colon cancer cells cocultivated with nude mouse skin fibroblasts did not. One possible explanation is that fibroblasts from the skin produce IFN-β, whereas those

The pathogenesis of cancer metastasis: relevance to therapy from the kidney or colon do not. The incubation of human colon cancer cells [51] and human renal cancer cells [91] with IFN-β significantly reduced the expression and activity of collagenase type independently of antiproliferative activity.

Regulation of Angiogenesis by the Organ Microenvironment The intensity of the angiogenic response varies considerably among different types of tumors and within different zones of a single tumor [48]. The rate of tumor cell division is still several orders of magnitude greater than the rate of neovascularization. As tumors expand, their microenvironment is often hypoxic [260]. Hypoxia is often associated with the activation of the transcription factor hypoxia-inducible factor-1 alpha (HIF-1α) to initiate the transcription of genes, e.g., VEGF/VPF [54]. VEGF/VPF increases the permeability of blood vessels by stimulating the functional activity of vesicular-vacuolar organelles, clusters of cytoplasmic vesicles and vacuoles located in microvascular endothelial cells [45–47]. VEGF also induces migration, protease production, and endothelial cell proliferation [54]. In addition, VEGF/ VPF regulates endothelial cell survival by activating the phosphatidylinositol-3 kinase/Akt signal transduction pathway and stimulating expression of the antiapoptotic proteins Bcl-2 and A1 [110]. HIF-1α signaling also encodes the polypeptide chains of PDGF [100]. The functional activity of PDGF is, to a large extent, determined by the anatomical location of a specific tumor. For example, in pancreatic tumors, PDGF has been shown to stabilize developing vascular networks by recruiting pericytes to support the immature blood vessel walls [13, 14]. In tumors of the central nervous system, PDGF stimulates the release of VEGF from the tumor-associated endothelium [96]. In contrast, tumors in the skin rely on PDGF signaling to regulate the level of interstitial fluid pressure in the tumor [199]. In prostate cancer bone metastasis (see next section), PDGF functions as a survival factor for tumor endothelial cells by activating the intracellular effectors MAPK and Akt [142, 143]. The vascular endothelium is regarded as structurally and functionally heterogeneous [88]. To examine this diversity, we generated a broad panel of microvascular endothelial cells from various organs of H-2Kb-tsA58 transgenic mice [142]. cDNA expression profiles generated on the endothelial cells predicted significant organspecific differences in expression levels of tyrosine kinase

Sun-Jin Kim et al. receptors, chemokine receptors, and proteins that regulate the efflux of toxic substrates; these were confirmed at the protein level. Endothelial cells derived from the mouse brain expressed measurable levels of PDGF-Rβ, the chemokine receptor CXCR-2, and P-glycoprotein, whereas endothelial cells from the pulmonary circulation did not express detectable levels of these proteins. The organ-derived endothelial cells also exhibited vast differences in response to stimulation with endothelial cell mitogens. Endothelial cells originating from the brain and liver showed the greatest increase in cell division in response to basic fibroblast growth factor, while EGF was the most potent mitogen for endothelial cells derived from the lung and uterus.

Influence of Lymphoid Cells on Angiogenesis The regulation of angiogenesis by T lymphocytes, macrophages, and mast cells, is well established [55, 59, 68, 83, 160, 164, 169, 204, 223, 240]. For example, invasive cutaneous melanoma is often associated with a local inflammatory reaction involving T lymphocytes and macrophages, a condition often associated with an increased risk of metastasis [19, 217]. The relatively slow growth of tumors in aging mice has been closely linked with decreased vascularization [133] associated with a diminished immunological response [38, 92]. The role of tumor vascularization and its effect on tumor growth in immunosuppressed mice was investigated and it was concluded that the growth of the immunogenic B16 melanoma was delayed in myelosuppressed mice as compared to control mice [98]. Similarly, tumor growth in mice pretreated with doxorubicin (DXR) and then injected with normal splenocytes 1 day before tumor challenge was comparable to that in the control mice, implicating myelosuppression as a cause of retardation of tumor growth and vascularization. Similar results were obtained with athymic nude mice [98]. Many other studies have recognized the importance of macrophages in tumor angiogenesis [5, 204–206, 239]. Macrophages can produce more than 20 molecules that influence endothelial cell proliferation, migration, and differentiation [204, 205]. Macrophages may modify the extracellular matrix, thereby modulating angiogenesis either through direct production of extracellular matrix components or proteases that alter the structure and composition of the extracellular matrix [240]. Macrophages have also been shown to produce antiangiogenic molecules, such as thrombospondin-1 [40, 152, 153, 205].

29 Macrophage-derived metalloelastase has been shown to be responsible for the generation of angiostatin in Lewis lung carcinoma [42], and the addition of plasminogen to 3LL Lewis lung carcinoma cells cultured in vitro did not result in the generation of angiostatin. However, its addition to co-cultured macrophages and carcinoma cells did [42], suggesting that elastase activity in macrophages was significantly enhanced by the cytokine GM-CSF which was secreted by the tumor cells [137], leading to the generation of plasminogen.

Regulation of Response to Chemotherapy by the Organ Microenvironment Clinical observations suggest that the organ environment can influence the response of tumors to chemotherapy. For example, in women with breast cancer, lymph node and skin metastases are more sensitive to chemotherapeutic agents than are metastases residing in either the lung or bone [41]. Several intrinsic properties of tumor cells can render them resistant to chemotherapeutic drugs, including increased expression of the mdr genes, leading to overproduction of the transmembrane transport protein P-glycoprotein (P-gp) [18, 249]. Expression of P-gp often parallels increases in dose or duration of chemotherapy. Indeed, increased levels of P-gp can be induced by selecting tumor cells for resistance to natural product amphiphilic anticancer drugs. Nevertheless, elevated expression of P-gp accompanied by development of the multidrug resistance (MDR) phenotype has also been found in many solid tumors of the colon, kidney, and liver that had not been previously exposed to chemotherapy [249]. One of the most striking examples of site-specific variations in therapeutic response was observed following implantation of colon carcinoma cells into different anatomic locations of nude mice (using the highly metastatic KM12L4 human colon carcinoma cell line) or syngeneic BALB/c mice (using the CT-26 murine colon carcinoma). Mice received injections of the KM12L4a cells into either the subcutis (ectopic site), spleen (leading to experimental liver metastasis), or cecum (growth at the orthotopic site). Tumor-bearing mice were given doxorubicin and subsequently evaluated for response to treatment. Up to 80% growth of subcutaneous tumors was inhibited by two i.v. injections of doxorubicin as compared to about 40% inhibition of the intracecal tumors and less than 10% inhibition of lesions in the liver [267]. Similar results were obtained with murine

30 colon cancer cells. Subcutaneous tumors were sensitive to treatment with doxorubicin; lung metastases were insensitive [42]. However, the tumor cells at both of these sites were equally sensitive to 5-FU, a drug whose activity is not influenced by expression of the MDR phenotype. Northern blot analysis showed that the relative expression of the mdr1 and mdr3 genes was greatest in the cecum, liver, and lungs of mice, and this expression correlated with the relative resistance of tumor cells. Indeed, this expression of mdr was transient and the subsequent culture of cells from a liver metastasis for 7–10 days resulted in a decrease of mdr expression to the level in tumor cells maintained in culture [43]. These events resulted from organ-specific modulation of tumor cell properties. These findings are not restricted to experimental systems. In patients with colon carcinoma, elevated P-gp expression is found on the invasive edge of the primary tumor (growing in the colon) and in metastases located in lymph node, lung, and liver [129]. Whether this finding is due to selection or adaptation is unclear.

The pathogenesis of cancer metastasis: relevance to therapy to up-regulate the growth factor receptors and the activation of these receptors on tumor cells (autocrine effect) and on tumor-associated endothelial cells (paracrine effect). These effects can lead to downstream signaling that activate mitogen-activated protein kinases and phosphatidylinositol-3 kinase pathways and lead to downregulation of the apoptotic proteins caspases 3 and 8 [8, 142, 143, 229]. Activation of growth factor receptors on tumor cells and on the tumor-associated endothelial cells is likely to increase the expression of antiapoptotic proteins, causing endothelial cell resistance to chemotherapy, even though these cells divide every 30–40 days. Inhibition of this growth factor receptor activation by receptor antagonists in tumor-associated endothelial cells (and tumor cells) can lead to BAX induction, activation of caspase-8, and down-regulation of BCL-2 and NF-κB [1, 24], thereby increasing the susceptibility of tumors to chemotherapy. If the tumorassociated endothelial cells continue to cycle, the use of receptor antagonists [6, 7, 125–128] combined with anticycling drugs can cause the destruction of the vasculature within neoplasms, leading to the apoptosis of adjacent tumor cells [20, 21, 193, 232].

Targeting the Vasculature Because systemic antitumor therapy fails primarily because of the genetic instability and biologic heterogeneity of neoplasms, therapeutic agents that target a tumor’s vasculature, a genetically stable and essential component of tumors, have been explored as an alternative to conventional therapy. The structure and architecture of tumor vasculature can differ dramatically from those of normal organs [48, 182, 189]. Modern techniques, such as phage display targeting, have defined “vascular addresses” that may be distinct for different organs and for tumors in those organs [194]. In normal human tissues, for example, endothelial cells are long lived and recycle every 3–5 years, whereas tumor-associated endothelial cells can recycle every 30–40 days. The rate of endothelial cell turnover has been reported to be <0.1% in normal human tissues, whereas in malignant human tumors, it is 2–9.9% [48, 49]. Endothelial cells that line blood vessels in different organs are also phenotypically distinct. The expression of various cytokines and growth factors and their relevant receptors on both tumor cells and organ-specific endothelial cells differs in different organ microenvironments, and the interaction of these growth factor ligands (i.e., EGF, TGF-α, VEGF, and PDGF) with their relevant receptors is essential for endothelial cell survival and growth [6, 7, 128, 142, 143]. For example, tumor cells that produce growth factor ligands are likely

Targeting the Expression of Platelet-Derived Growth Factor Receptor by Reactive Stroma Colon carcinoma cells produce various growth factors and cytokines that contribute to progressive growth and metastasis [117]. One example is the family of PDGFs, members of a family of dimeric disulfide-bonded growth factors exerting their biological effects through activation of two structurally related tyrosine kinase receptors, the PDGF-α- and -β receptors [104]. PDGF consists of dimeric forms, including PDGF-AA, PDGF-BB, PDGF-AB, PDGF-CC, and PDGF-DD [15, 144, 149]. The α-receptor binds all possible forms of PDGF except PDGF-DD, whereas the PDGF-β receptor preferentially binds PDGF-BB. PDGF-Rβ is expressed on many tumor types, and PDGF-BB is an important autocrine growth factor for many cell types, including gliomas, sarcomas, pancreatic carcinoma, and prostate cancer [103]. PDGF-R signaling has also been reported to stimulate angiogenesis [213], recruit pericytes [14, 192], and control the interstitial fluid pressure in stroma, thereby affecting transvascular transport of chemotherapeutic agents [200–203]. A recent study of human colon cancer clinical specimens revealed that PDGF-Rβ and phosphorylated PDGF-Rβ are not expressed on tumor cells but, rather, are predominantly

Sun-Jin Kim et al. expressed in stromal cells and in pericytes surrounding the tumor microvessels [131, 132, 238, 241]. Imatinib, a derivative of 2-phenylaminopyrimidine, was originally developed as a competitor for an ATPbinding site of the Abl protein tyrosine kinase [44]; however, it is also a potent tyrosine kinase inhibitor of c-Kit and PDGF-R [22]. We have reported that imatinib can slow both the progressive growth of human pancreatic carcinoma in nude mice [114, 270] and the growth of experimental bone metastasis of human prostate cancer [127, 251]. To examine the role of PDGFR on colon cancer stromal cells, we examined the therapeutic effect of imatinib administered as a single agent or in combination with the chemotherapeutic irinotecan against human colon carcinoma cells growing in orthotopic (cecum and liver) and ectopic (subcutis) organs of nude mice. Blockade of PDGF-Rβ signaling by oral administration of imatinib or imatinib combined with irinotecan significantly inhibited the growth of orthotopic tumors and the incidence of lymph node metastasis in nude mice. Histopathological analysis of human colon carcinoma growing in the cecum and liver of nude mice treated with imatinib alone or with imatinib combined with irinotecan demonstrated decreased stromal reaction and inhibition of phosphorylated PDGF-Rβ in the tumor-associated stromal cells. These effects were associated with the inhibition of tumor cell proliferation, an increase of apoptosis in stromal cells, and a decrease in the number of pericytes surrounding the tumor-associated microvessels. In contrast, treatment of mice with imatinib alone or imatinib combined with irinotecan did not affect the growth of colon carcinoma cells in the subcutaneous space, demonstrating once again that the biology of tumors differs with the organ microenvironment [58, 76]. In general, tumor cells in a neoplasm are biologically heterogeneous and their phenotype can be modified by the organ microenvironment [63, 74]. Histologically, human carcinoma tissues are composed of both parenchyma and stroma. Tumor stroma consists of fibroblasts, smooth muscle cells, inflammatory cells, microvessels, and abundant extracellular matrix (ECM) [99]. Tumorassociated stroma at both primary sites and metastatic sites generate a favorable microenvironment for the survival of cancer cells [155]. Fibroblasts are activated by various growth factors and cytokines that are released by cancer cells, for example TGF-β, PDGF, and bFGF. Activated fibroblasts express αSMA, leading to the term ‘myofibroblasts’ [45]. Stromal reaction (desmoplasia), such as myodifferentiation of fibroblasts [109, 145, 215] clearly alters the stromal phenotype. In the liver, hepatic stellate cells are the only mesenchymal cells present in

31 the parenchyma. These cells are activated by various stimuli from tumor cells and undergo transformation into myofibroblasts, which are characterized by expression of αSMA [211]. In general, tumor-associated stroma is an abundant source of tumor-promoting growth factors and cytokines, and stromal cells activated by cancer cells can in turn regulate the growth and progression of carcinoma cells [112, 165, 222, 250]. The progressive growth of colorectal tumors in experimental animals has been correlated with proliferation of myofibroblasts, whereas regression of colon tumors has been linked to a fibrous capsule, suggesting that the presence of reactive myofibroblasts may inhibit growth of tumor cells [150]. Wounding has been associated with tumorpromoting effects [224] and, functionally, tumor-associated stromal cells are similar to stromal cells in healing wounds insofar as expression of myodifferentiation markers, production of ECM, expression of growth factors and cytokines, and neovascularization [121–123]. The combination of imatinib and irinotecan completely inhibited tumor cell growth at the abdominal wound healing site induced at the time of tumor cell injection into the cecum [131]. Imatinib may inhibit stromal reaction at the orthotopic primary site and the surgical wound. PDGF-R signaling pathway also plays an important role in increasing tumor interstitial hypertension, which may block the accumulation of antitumor drugs [201–203]. The microvasculature in both tumor tissue and normal colon mucosa consists of endothelial cells, pericytes (mural cells or smooth muscle cells), and basement membranes. All of these components are thought to be abnormal in tumor vessels. Pericytes are key cells in vascular development, stabilization, maturation, and remodeling [12, 87]. Functional-blocking antibodies that target PDGF-Rβ block pericyte recruitment during vascular development [252]. In our study, desmin-positive pericytes were found on microvessels in both normal organs and colon cancers, albeit with different morphological characteristics. Specifically, pericytes in tumor-associated vessels, but not those in vessels of normal colon mucosa, were enlarged and overexpressed PDGF-Rβ and p-PDGF-Rβ [131]. In agreement with earlier reports [14, 269, 270], we found that treatment with imatinib decreased pericyte coverage on tumor-associated endothelial cells. The inhibition of PDGF-R signaling by a protein tyrosine kinase inhibitor decreased pericyte recruitment and attachment to endothelial cells and destabilized tumor vasculature by killing pericytes. In the absence of decreased vessel density in tumors treated with imatinib combined with irinotecan, functional rather than quantitative changes of the tumor vasculature by imatinib may diminish tumor growth [84].

32 Recently, targeting the VEGF pathway to inhibit tumor angiogenesis is attracting attention as a novel cancer therapy [113]; however, it has been suggested that VEGFtargeting therapies are mostly active against immature vessels [13], i.e., normalization of the tumor vasculature [118]. Because imatinib inhibits pericyte coverage on tumor vasculature, it will be very interesting to determine if the combined inhibition of PDGF-R and VEGF-R signaling may produce synergistic antivascular effects [45, 118, 200]. Multi-target tyrosine kinase inhibitors are under current investigation in clinical trials. Sorafenib and sunitinib target not only multiple VEGF-Rs but also PDGF-Rβ, and phase II studies show promising activity of these molecules in renal cell carcinoma [180], likely due to inhibition of angiogenesis [266].

Anti-Vascular Therapy of Prostate Cancer Bone Metastasis In clinical specimens of human prostate cancer bone metastasis and in experimental models of orthotopic human prostate cancers in the long bones of nude mice, the expression of PDGF and PDGF-R correlates with the growth of metastatic tumor cells in the bone parenchyma. Specifically, prostate cancer cells growing adjacent to bone tissue express high levels of the PDGF protein and the PDGF-R, which is phosphorylated, and tumor-associated endothelial cells express high levels of phosphorylated PDGF-R [127, 128]. Oral administration of the PDGF-R tyrosine kinase inhibitor imatinib (STI571) to nude mice blocks the PDGF signaling pathway by inhibiting phosphorylation of its receptors [251]. Oral administration of STI571 or STI571 plus injectable taxol to male nude mice reduced the incidence and size of primary tumors and bone lesions and prevented bone lysis as measured by digital radiography. Immunohistochemical analysis of control, untreated bone lesions, demonstrated that human prostate cancer cells growing adjacent to the bone expressed high levels of PDGF and activated (phosphorylated) PDGF-R, whereas tumor cells growing in the adjacent musculature following lysis of the bone did not. Treatment with STI571 and more so with STI571 plus taxol significantly inhibited phosphorylation of PDGF-R on tumor cells and endothelial cells, decreased tumor cell proliferation, and induced significant apoptosis in tumor cells and tumor-associated endothelial cells. These data indicate that targeting PDGF-R phosphorylation can produce significant therapeutic effects against prostate cancer bone metastasis [125–128].

The pathogenesis of cancer metastasis: relevance to therapy To determine whether the PDGF-R expressed on tumor-associated endothelial cells could be the primary target of imatinib, we selected a multidrug-resistant variant of the human PC-3MM2 prostate cancer. These cells were implanted into the tibia of nude mice, and when the lesions were growing progressively, the mice were randomized to different treatment regimens. The bone tumors were resistant to taxol, whereas treatment with imatinib and taxol produced a significant decrease in tumor incidence, bone lysis, and incidence of lymph node metastasis. Initially, this treatment produced apoptosis of tumor-associated endothelial cells (but not tumor cells), followed 1 week later by apoptosis of the tumor cells. Collectively, these studies demonstrated that the primary targets for imatinib treatment are the tumor-associated endothelial cells, i.e., an anti-vascular therapy [126].

Targeting Platelet-Derived Growth Factor Receptor on Endothelial Cells of Multidrug Resistant Prostate Cancer The major cause of death from prostate cancer is due to metastases that are resistant to conventional therapies. Genetic instability of tumor cells leading to biological heterogeneity is largely responsible for the development of hormone-refractory prostate cancer cells [10, 11, 56, 197, 198, 254–257], and selection pressures by chemotherapeutic agents results in the emergence of cells that are resistant to chemotherapy [122, 147, 159, 198, 221, 231]. These resistant cells often express the MDR1 gene and its product, P-glycoprotein (P-gp) [94, 248, 257]. Methods to overcome multidrug resistant activity by blocking transmembrane drug efflux pump action [82, 166–168, 176], liposomal encapsulation of cytotoxic drugs [18], immunotherapeutic monoclonal antibody targeting P-glycoprotein [214] or protein toxins selectively killing cells expressing P-glycoprotein on their surfaces [168] are under clinical investigation. Multidrug resistance-associated protein (MRP) was found in multidrug resistant prostate cancer cell lines that do not express P-glycoprotein [34]. MRP1 [237, 256] and MRP2 [255] have been reported to be expressed in prostate cancer cell lines, but there are very few compounds with proven MRP1-associated multidrug resistant-modulating capacity at present. Glutathione and glutathione-S-transferase (GST) detoxification systems are another drug-resistance mechanism reported to

Sun-Jin Kim et al. protect cancer cells against the lethal effects of chemotherapy [174]. GST-π inactivation is related to early steps of prostate carcinogenesis [146, 237], whereas the hormone-independent disseminated prostate cancers clearly expressed GST-π [256]. However, reversal of multidrug resistance in prostate cancer by challenging the glutathione pathway has been observed in vitro [212]. Many changes in the regulatory processes of apoptosis apparently contributed to the malignant phenotype of prostate cancer cells [35, 39, 188, 256], and methods to stimulate apoptosis are currently under development. However, despite progress in our understanding of the biology of MDR, therapeutic approaches that directly target tumor cells have not been successful. To overcome multidrug resistance of prostate cancer, one may wish to affect the host factors in the organ microenvironment, such as the vasculature [26, 63, 72, 78–80, 122]. Because all cells in the body depend on an adequate supply of oxygen and nutrients and the ability to remove toxic molecules, therapy directed against tumor-associated endothelial cells can destroy tumor cells, regardless of their biological heterogeneity [77]. Recent reports have demonstrated statistically significant therapeutic results in experimental human prostate cancer bone metastasis in nude mice treated with a combination of paclitaxel and various tyrosine kinase inhibitors directed toward PDGFR or EGFR [125–128, 251]. These experimental data have been successfully translated to clinical trials [45, 46]. Since both tumor cells and tumorassociated endothelial cells can express these activated growth factor receptors, it has not been clear whether the combination treatment targeted the tumor cells or the endothelial cells or both. We reported that multidrug resistant PC-3MM2-MDR human prostate cancer cells growing in the prostate of nude mice are resistant to systemic administration of paclitaxel. Targeting the phosphorylated PDGF-R on tumor-associated endothelial cells leads to regression of the multidrug resistant prostate cancer and inhibition of lymph node metastasis. As stated previously, regardless of sensitivity or resistance to hormones or chemotherapeutic drugs, all tumor cells are dependent on a viable vasculature for growth and survival [56, 62, 123]. Tumor cells interact with host factors in the microenvironment to induce growth and expansion of vasculature [70, 72, 121]. We have reported [126–128] that PDGF produced by prostate cancer cells growing adjacent to bone can increases and activate the expression of PDGF-R on tumor-associated endothelial cells by a paracrine mechanism. The systemic administration of imatinib inhibited the phosphorylation of PDGF-R (but not EGF-R) [128], and the combination of imatinib and paclitaxel induced apoptosis of

33 tumor-associated endothelial cells as well as PDGF-Rexpressing tumor cells. The expression of phosphorylated PDGF-R is known to activate anti-apoptotic pathways involving Akt, PI3K, MAPK, and Bcl-2 [142, 143], and treatment with imatinib can inhibit this effect. These data suggest that a major target for imatinib and paclitaxel therapy could well be the tumor-associated endothelial cell. We tested this possibility by using MDR human prostate cancer cells. The acquisition of multidrug resistance by leukemia cells [162], hepatocellular carcinoma [273], and human lung carcinoma [163] has been shown to decrease tumorigenicity and prolong tumor cell doubling time. In agreement with these reports, the in vivo growth of the human prostate cancer PC-3MM2 selected for multidrug resistance (PC-3MM2-MDR) was slower than the parental tumor cells. The ‘seed and soil’ theory [63, 193] held true regardless of the MDR phenotype. Similar to parental cells, MDR tumor cells growing in the bone (but not in the muscle) expressed IL-8, bFGF, EGF, EGF-R, PDGF, and PDGF-R. Endothelial cells of tumor-associated vessels in bone lesions also expressed PDGF-R on their surface, and treatment with imatinib and paclitaxel inhibited the phosphorylation of the PDGF-R on both tumor cells and endothelial cells. The PC-3MM2-MDR bone lesions responded to systemic administration of imatinib and paclitaxel (but not to paclitaxel administered alone), raising the possibility that imatinib could have sensitized the tumor cells to paclitaxel. Immunohistochemical analyses revealed that early apoptosis (after 2–3 weeks of chemotherapy) was mostly limited to tumor-associated endothelial cells. The multidrug resistant tumor cells were still treatment-resistant. In contrast, parental cells underwent extensive apoptosis in mice treated with imatinib and paclitaxel. The PDGF-R has been shown to regulate the interstitial hypertension and transcapillary transport of molecules [108], and the administration of imatinib to mice bearing tumors can increase the concentration of a systemically administered chemotherapeutic drug within a tumor by twofold to threefold [201–203]. Since the PC-3MM2-MDR cells were >50-fold more resistant to paclitaxel even in the presence of imatinib, the in vivo therapeutic response of the PC-3MM2-MDR bone tumors to imatinib and more so to imatinib plus paclitaxel could not have been due to changes in interstitial fluid pressure. Endothelial cells in normal tissues rarely divide, whereas 2–3% of endothelial cells in prostate cancer divide daily [4, 48]. These dividing endothelial cells should be sensitive to anticycling drugs such as paclitaxel. As stated above, the first wave of apoptosis in bone tumors from mice treated with imatinib and

34

The pathogenesis of cancer metastasis: relevance to therapy

paclitaxel for only 2 weeks occurred in tumor-associated endothelial cells, followed by apoptosis of tumor cells and ultimately necrosis. By the fourth week of treatment with imatinib and paclitaxel or imatinib alone, concurrent apoptosis of tumor cells and tumor-associated endothelial cells was observed. Without paclitaxel, imatinib may produce therapeutic effects by the blockade of PDGF-R, which serves as a survival factor [142, 143]. Therefore, targeting the PDGF-R on tumor-associated endothelial cells by imatinib and paclitaxel can produce therapeutic results in multidrug resistant human prostate cancer experimental bone metastasis.

using homogeneous therapy. In other words, it is unlikely that therapy of cancer in general and metastasis in particular can be accomplished using a single modality. Second, cancer is a chronic disease. A chronic disease must be treated chronically, i.e., by management. Third, cancer is the disease of the “seed” and the “soil”. Since the outcome of metastasis depends on multiple interactions of metastatic cells with homeostatic mechanisms in the organ microenvironment, therapy for metastasis should be targeted not only against tumor cells, but also against the homeostatic factors that helps metastatic cells grow and survive.

Conclusions

References

A current definition of the seed and soil hypothesis consists of three principles. First, neoplasms are biologically heterogeneous and contain subpopulations of cells with different properties. Second, the process of metastasis is selective for cells that must succeed in all the steps of this complex process. Although some of the steps in this process contain stochastic elements, as a whole, metastasis favors the survival and growth of a few subpopulations of cells that preexist within the parent neoplasm. Thus, metastases can have a clonal origin, and different metastases can originate from the proliferation of different single cells. Third, the outcome of metastasis depends on multiple interactions (“cross-talk”) of metastatic cells with homeostatic mechanisms, which the tumor cells can exploit. A convincing example of this principle is the establishment of tumor-associated vasculature. Tumor growth and metastasis depend on an adequate blood supply. The extent of angiogenesis within and around tumors is regulated by the balance between proangiogenic and antiangiogenic molecules. The crosstalk between tumor cells, normal cells, leukocytes, and stromal cells occurs through growth factors, growth factor receptors, and cytokine signaling, all of which are released and act on cells within the tumor microenvironment. These interactions enhance the establishment of angiogenesis that in turn regulates the proliferation and survival of metastatic cells. Interruption of one or more of these interactions can lead to the inhibition or regression of metastasis. Because the growth of primary tumors is often controlled with surgery and/or irradiation, antiangiogenic agents may be most beneficial to prevent widespread and metastatic disease. To succeed, several principles must be considered. First, it is essential to remember that all neoplasms are biologically heterogeneous. One cannot treat a heterogeneous disease

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3

Developmental therapeutics and the design of clinical trials ROBERT K. OLDHAM

New techniques in biotechnology and the use of biologicals in cancer treatment have made it apparent that developmental therapeutics for biotherapy are different from standard drug development. Millions of chemicals have been screened as anticancer agents, but less than 75 have reached the clinic as commercial pharmaceuticals. Perhaps 20 of these drugs can be classed as moderately effective; the rest are only marginally useful and all can be highly toxic. With the discovery of monoclonal antibodies and conjugates thereof, the exploitation of bioengineering to produce purified, characterized lymphokines/ cytokines and other biologicals, and further information on the mechanism of action of these natural molecules, the rate of development for biological therapeutics has risen dramatically. Because of their selectivity and with the implicit biological diversity of cancer, new approaches are needed to efficiently bring biotherapy to the clinic. Previously, there have always been fewer promising agents (drugs) to test than patients who needed new approaches. In fact, the drug development paradigm has been a slow and laborious, with each drug taking some 8–12 years to gain commercial approval, at a cost of more than US$500 million per drug. Taxol, a drug approved for general use, entered clinical trials in the late 1980s and only became generally available in 1998; taking more than a decade to pass through our current system of drug development. On average, fewer than four new chemotherapy drugs per year have been approved for general use by oncologists. This expensive and slow paradigm reflects both the toxicity and marginal effectiveness of chemotherapeutic drugs as well as a bureaucratic regulatory system more fearful of criticism over toxicity than a willingness to pursue opportunities for seriously ill patients [33, 70, 71, 83]. More recently, a large number of biological substances and targeted therapies have been making their way to the clinic, increasing the difficulty of decisions as to the order and amount of preclinical and clinical testing. Hundreds of biologic agents are in clinical testing with more agents to test than there are easily available patients for testing. The current system for drug development is not sufficiently flexible, and needs major changes in direction and technique to optimize clinical testing and

R.K. Oldham and R.O. Dillman (eds.), Principles of Cancer Biotherapy, © Springer Science + Business Media B.V. 2009

speed the translation of new approaches to patients [6, 8, 17, 21, 22, 24, 30, 32, 33, 41, 55, 57, 61, 76–82, 90, 91, 94, 98, 99, 103]. Although the concept of biotherapy is not new, the use of recombinant genetics to produce highly purified biologicals as medicinals dates from about 1980 [31]. A member of the alpha-interferon family was the first biological produced by recombinant methods to be used as an anticancer medicine in humans [103, 105]. In the 25 years since the first alpha-interferon molecule was prepared by recombinant methods, a large number of recombinant molecules (lymphokines, cytokines, monoclonal antibodies, growth and differentiation factors, angiogenesis factors and cell receptors) have become available or are being prepared for testing in the clinic (see Chapter 8). Historical aspects in the development of immunotherapy have been reviewed [12, 75]. Before the 1980s, the term immunotherapy was considered to be synonymous with biological therapy by most investigators. However, it is now clear that there are many biological approaches that may affect cancer growth and metastases, yet are not within the immune system. Thus, biotherapy now refers to agents derived from biological sources and/or the use of agents that affect biological responses. The term “biologicals” describes agents extracted from or produced from biological materials. With biotechno-logy, this involves the use of recombinant genetics to isolate the gene, transfect it into an appropriate producer organism, and then the isolation and purification of the protein product. Genomics and proteonomics are processes to yield the “code” to eventually prepare biological therapy by chemical synthesis. The types of materials that alter biological responses for the benefit of the patient have been called biological response modifiers (BRM). The use of biologicals and BRM in the treatment of cancer and other diseases is biotherapy (a term I initially used in 1984 to describe this fourth modality of cancer treatment) [84, 85]. As is always the case, nomenclature can be confusing and terms may be variously defined by different individuals. In the broadest sense, biotherapy includes blood products, transplanted organs, bone

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42 marrow/stem cell transplants, antibiotics (often derived by extraction from biological organisms and later synthesized), and a variety of other agents and approaches. However, in this chapter, the focus will primarily be on BRM, recombinant biologicals and gene engineered or activated cells being developed as medicinals. Immunotherapy has had a checkered past. Kari Cantell said it well when describing some of the early interferon research: “Much second class research was carried out with third class preparations slightly contaminated with interferon” [5]. In addition, there have been questionable approaches (“alternative medicine”) used by certain practitioners, and even frank quackery by others who purported to deliver “immunotherapy” for cancer patients. Even for the very dedicated scientists who have explored immunotherapy over the past several decades, there have been many pitfalls relating to the purity of their preparations, the source of the materials, and the assays and techniques by which their measurements were made. Huge expenditures by the National Institute of Health (NIH) in the area of molecular, biological and viral oncology over the last 40 years led, in large part, to the current technology of “genetic engineering.” In contrast to previous attempts to develop biological therapy, we now have techniques available that can isolate a single gene and use it in a bio-manufacturing process to produce absolutely pure proteins identical to those found in the body. It is with these techniques that thousands of biological compounds and their synthetic analogs and components are being developed. Many of these biologicals will be candidates for use as medicinals. A major value of the research done thus far with interferon is that it may be viewed as a model for the development of other biological substances as medicinals [61, 76]. Interferon research in particular and biotherapy in general must be seen as a new challenge in developmental therapeutics, with agents to be tested appearing at a still accelerating rate. No longer can the historical drug development paradigm be used [55]. The methods used by the Food and Drug Administration [11], National Institutes of Health, and the pharmaceutical industry in the development of drugs must be drastically changed to a new paradigm that will accommodate the realities relevant to biologicals and their use in medicine [33, 55, 71, 82, 86, 87, 90].

Drug Development The current process of drug development involves a very long and costly set of procedures [33, 55, 80]. This includes the initial concept, extraction or synthesis,

Development therapeutics and the design of clinical trials formulation, documentation of biological activity and purity, early studies in the laboratory and in experimental animals to determine the mechanism of action and toxicity, and compilation of all the preclinical data into an investigational new drug application (INDA). It costs millions of dollars for a pharmaceutical company to file a single INDA. During preclinical development, companies make projections about the potential market size and profitability as justification for the investment. These projections are difficult, and are most accurate when related to an existing drug in a known market. It follows that predicting the market size for a totally new agent or new approach is much more difficult. Subsequent to the INDA, further preclinical work on the mechanism of action and preclinical toxicology of a new drug is done. In addition, early-phase clinical studies are begun to determine biological activity in humans. Although the process is not uniform for all classes of pharmaceuticals, studies are termed “phase I” when the dose of the drug is escalated to determine its biological activity and its toxicity. Based on the preclinical toxicology information in small animals and sometimes in primates, projections are made for the starting dose in humans. A low starting dose is selected to avoid severe toxicity in the initial patients in a phase I clinical trial. The rate of dose escalation in these trials and the acceptability of toxic side effects vary with the population at risk and are related to the seriousness of the disorder and the treatment alternatives for the patient. Because the starting doses are very low and because of phase I trial design, using different patients at each dose level (to avoid cumulative toxicity), the chance of a therapeutic effect for the initial patients receiving a new agent is nearly zero. It is axiomatic that the phase I trials are designed to accumulate the maximum amount of clinical information with the least toxicity. Generally, the end point for phase I trials is the achievement of a maximum tolerated dose (MTD), the dose at which side effects are unacceptable to the physician and the patient within the design of that clinical trial. These trials may require 100–500 patients to reach agreement on the MTD in two to four schedules and routes of administration. In addition, pharmacokinetic and metabolism studies are done as part of Phase I. Once the MTD is established, subsequent investigators can be reasonably assured that the upper limit for the dose to be administered is well defined and that therapeutic activity will not be missed in later phase trials because of sub-therapeutic doses. Phase II studies are then conducted to determine the therapeutic activity of the new drug in various types of cancer. Patients with specific cancers are selected in order that these trials can be conducted in reasonably

Robert K. Oldham uniform patient groups. Based on the preclinical information and the clinical toxicology studies, as well as pharmacokinetic and metabolic considerations, therapeutic doses are selected that represent the investigator’s “best guess” as to the therapeutically active dose range. In addition, schedule and route of administration must be considered. In phase II trials, it is often necessary to administer an agent at different doses by different routes (e.g., intramuscular, intravenous, subcutaneous, oral) and on different schedules (e.g., once a day, three times a day, 24-h infusion, etc.). Phase II trials are considered complete when a substantial body of data exists concerning the therapeutic activity of a new drug with reference to best dose, route of administration, and schedule for therapeutic efficacy. If one accepts classical criteria for cancer subtypes, over 100 histologic types of cancer exist. If one assumes a standard statistical criterion of at least 14 patients treated to look for one response so as not to miss a 20% response rate, then a new drug would need to be tested in a minimum of 1,400 patients by each schedule and route to assure clinicians of its inactivity in each tumor type; and if one assumes three routes and five schedules must be tested, over 21,000 patients would need to participate just to prove a specific drug ineffective. Such studies demonstrating inactivity sacrifice patients “for the good of the system.” Such FDA-mandated testing stretches ethical standards to the limit. Following the completion of adequate phase I and phase II trials, phase III trials to compare a new agent with standard treatment are conducted. The extent of phase III trials depends on the treatment alternatives available. In the case of diseases for which other therapies are effective, such trials may need to be extensive, controlled, and employ random designs, sometimes with blinding of the study both to the physician and to the patient. Such phase III trials have produced an enormous literature on the subject of ethics, trial design, end points, and the assessment of efficacy [9, 23, 28, 38, 71, 82, 91, 92, 95, 106, 107, 110]. If, in such phase III trials, a new agent proves therapeutically superior without unacceptable side effects, in comparison with or in addition to “standard” therapy, the new agent is very likely to receive FDA approval. Since “standard therapy” is often only marginally effective, large randomized trials proving a new treatment is significantly (usually marginally) better means most patients derive little or no real therapeutic benefit in the trials. Where efficacious therapy with an approved drug is not available, fewer phase III data may be needed to gain approval, and patients with advanced cancer are often randomized against best supportive care or a placebo. This latter practice also stretches ethical practice to the limit [47, 71, 95].

43 Most drugs fail at the phase I/II level, being either too toxic or inactive. Drugs that complete phase II trials with acceptable toxicity and activity in at least one cancer have a greater than 50% chance of successfully passing phase III with eventual approval by the FDA. For this reason, it has been suggested that drugs should be approved for general use at the end of phase II to speed up the process of bringing new drugs to the clinic [47, 83]. The final step in the commercial development of a new drug requires the filing of a new drug application (NDA). All the information available under the INDA and all of the data from the phase I, II, and III testing are made available to the FDA for review and consideration. Only the FDA is authorized to approve a new drug for sale in the United States; this usually involves defining the drug dose, route of administration, schedule, toxicity, and therapeutic activity in specific diseases (indications). After FDA approval, the company may begin to advertise the agent for the approved use only. Uses outside the specific FDA approval indication(s) are termed “off label” uses. Perhaps 50% of all cancer drug therapy is “off label” use by physicians but the pharmaceutical industry is specifically prohibited by the FDA from providing clinical trial information to clinicians on “off label” drug activity. The long time and enormous expenditure in the current drug development system have been justified as being in the public interest inasmuch as the FDA requires extensive testing so active agents with reasonable toxicities (safe drugs) can be made available as medicinals. The definitions of reasonable toxicity and of therapeutic efficacy have been the subject of considerable debate, both in the general sense and relative to specific drugs. Often, the long-term effects and/or toxicities of approved drugs have prompted secondary revisions in the regulatory process, further lengthening and expanding the steps necessary for new drugs to be approved. This process would seem to be totally in the public interest. However, when viewed in another context, the process clearly has some exclusionary aspects [47, 66, 71, 83]. The FDA defines a single standard for drug development in the United States. Marked differences exist between countries as to a regulatory body’s role in drug development, and there are marked differences in the number of drugs available to patients in different countries. The regulatory agency of each country has its own view of what is ethical and in the public interest (different standards, different ethics). Thus, there can be reasonable debate on which rules are the best for the development of new drugs. Finally, it is obvious that the long development times and the huge expenditures required effectively

44 restrict competition in the area of drug development. Such restriction of competition gives major pharmaceutical firms a virtual monopoly on drug development. Although most pharmaceutical firms would undoubtedly say that they would prefer a lower cost for drug development, one may view the process as being in their best interests (barrier to entry), since it restricts competition from smaller firms that cannot marshal the resources to carry out these extensive and expensive studies [47, 55, 71, 79, 80, 82, 83]. Thus, our drug development paradigm is highly restrictive. It has worked reasonably well over the past 50 years only because of public acceptance of a conservative regulatory structure and because of the small number of relatively toxic drugs that actually were available for clinical testing. The advent of biologicals has placed great pressure on this paradigm. Indeed, the effective development of biologicals will require changes in the regulations and policies for the development of new pharmaceuticals [47, 55, 71, 78, 82, 90, 91].

Biologicals and BRM Development A process of developmental therapeutics similar to that described for chemicals (drugs) is now being applied to biopharmaceuticals. Historically, for new biologicals, the information on composition, formulation, and purity was often imprecise. In contrast to drugs, which are generally small, synthesized molecules with a chemical definition that is quite straightforward, biologicals have had a more variable developmental process. Preparing a biological for testing has involved extraction from a microorganism, from a fraction of a cell culture, or from a tissue (complex chemical mixture). Such extractions yielded complex mixtures with defined biological activity, where the precise chemical composition was incomplete or unknown [75]. Biotechnology is now making available a range of biologicals (lymphokines/cytokines, monoclonal antibodies, antigens, growth and maturation factors) that are pure and as well defined as small molecule drugs [55, 57]. Market size, the potential for profit, the long development period of preclinical and clinical testing, and the large investment necessary to develop new therapeutic agents have defined the scope of drug development. The development and testing of new biologicals will require extensive procedural and regulatory changes if we are to be successful in bringing these agents to the clinic quickly and efficiently [47, 55, 83, 92].

Development therapeutics and the design of clinical trials Perhaps the most cogent example relates to the development of monoclonal antibodies. For years there have been sufficient data to indicate that monoclonal antibodies are eventually going to be very useful both diagnostically and therapeutically [10, 26, 36, 40, 51, 52, 54, 62, 73, 94, 102, 103]. Now there are therapeutic antibodies approved for colon and breast cancer, lymphoma and leukemia with hundreds more in testing [8, 19, 21, 41, 94, 103]. The problems of developing new monoclonal antibodies for therapy is quite different from those previously encountered with drugs. The most striking of these problems relate to market size. Generally speaking, one looks at the population afflicted with a particular disease and makes the presumption that a new drug will be active in a certain percentage of patients with that disease. The percentage is often reasonably high and allows the market forecast to be applicable to a substantial number of patients. For example, the number of patients at risk per year with lung cancer is reasonably well defined, and once some evidence of clinical activity of a new drug in lung cancer is available, the market size for that drug can easily be calculated. For monoclonal antibodies, the situation is very different. At the extreme is anti-idiotypic monoclonal antibody therapy. It has been demonstrated in preclinical models and, to a more limited extent, in humans that anti-idiotypic antibody can be made to the specific tumor antigen (idiotype) of the neoplastic cell [11, 29, 39, 51, 65]. Such antiidiotypic antibodies or idiotype vaccines derived therefrom have proven useful in controlling the growth of the B-cell lymphomas. However, a critical problem for the development of these reagents is market size; here, it is the individual patient with that particular neoplasm. Thus, the market size might be as small as one. Even with some cross-reactivity, many of these antibodies or vaccines are expected to apply only to very small populations, much smaller than even the “orphan drugs” envisioned by FDA policy. Obviously, most pharmaceutical companies will never develop these kinds of “individualized or personalized medicines” under existing FDA guidelines [37, 71, 93, 94]. A less extreme example relates to the development of monoclonal antibodies for tumor-associated antigens that may be restricted to subpopulations of cancer cells [19, 20]. Considerable heterogeneity exists within any one histologic type of cancer (between patients) and even within a single patient’s cancer [54, 64]. It may be that for any one cancer only a small portion of the patient population will have a particular antigen or array of antigens on the cancer cell surface. Therefore, a monoclonal antibody might be applicable only to 1%, 5%, or 10% of the patients with a particular type of neoplasm.

Robert K. Oldham Because of clonal heterogeneity, both between patients and in different clones within individual patients, there may be the need to use multiple antibodies (“cocktails”) in treatment [1, 46, 69, 90]. Given the over 100 histologic types of cancer and the heterogeneity within each cancer type, market calculations may define very narrow applications [55, 63]. These considerations restrict market size to a level unapproachable given drug development costs under the current drug development paradigm. Perhaps less obvious, but equally problematic, will be the development of other biologicals for treatment. For lymphokines and cytokines, there is already evidence of both antigen-specific and non-antigen-specific signals that may have growth regulatory effects (See Chapter 8). One can visualize, with an antigen-specific lymphokine, how the signal may relate to the specific antigen and be applicable in a single patient, or a very few patients (e.g., transfer factor, IgE suppressor factors). Less restricted, but still highly restricted compared to standard drug development, is the development of non-antigen-specific lymphokines (e.g., interferons, lymphotoxins, interleukins), which are active against certain classes of cells, thus making them clinically applicable only in selected populations [55, 57].

Interferons: the Early Model Interferons represented early models for new biological approaches in cancer treatment [57, 61, 76]. “Natural” extracted interferons from stimulated white blood cells were used in initial clinical trials. The low purity, lotto-lot variation, and expense of stimulating leukocytes to produce interferon, along with the difficulties in the extraction and purification methods, limited the clinical use of these materials. These preparations were typical of early forms of nonspecific immunotherapy [5, 75]. With the advent of increased interferon availability through recombinant genetics, and with the very high purity (greater than 99%) of these preparations, extensive trials were completed for alpha-interferon preparations which led to the approval of alpha-interferon as the first genetically engineered anticancer biopharmaceutical [42, 76]. The design of phase I biotherapy trials should differ markedly from those for drugs. The dose-response curve for these agents may be very broad (and sometimes multiphasic), with peak effects at different doses for each system responding to the biopharmaceutical. For example, the immunomodulatory activity of alpha-interferon can be seen at very low doses, whereas the antiproliferative activity appears to be more reproducible at higher doses. In biotherapy, there is a need to measure biological

45 responses in the context of the clinical trials [37, 48, 50, 62, 105]. Since one may be administering the biological to stimulate a particular biological response, for which the dose-response curve may not be known a priori, one must perform studies with pharmacokinetics to assay serum availability, and also measure the desired biological effects to determine the optimal dose at which it might alter a particular biological response (optimal biological response modification, OBRM). Finally, schedule and route of administration have already proven important [42, 76]. The pharmacokinetics after intravenous and intramuscular administration differ for the alpha interferons [43], and there has been a variable lack of absorption of intramuscularly administered beta- and gamma-interferons [34, 74]. Thus, the proper design of phase I biotherapy trials must take into account appropriate measurements of bioavailability, pharmacokinetics, biological response modification, and toxicity, all in the context of escalating doses, to determine the dose– response curves for each of these properties. Responses to biologicals vary substantially between patients, and escalating doses in individual patients can yield valuable data without subjecting patients to “tests” with no therapeutic opportunity. Like most biologicals, the interferons may act through a diverse set of biological mechanisms. Cell surface receptors for their activity exist, and responses to the administration of biologicals are somewhat predetermined by the condition and biological receptor repertoire of the patient. This situation is in direct contradistinction to that of drugs, in which a totally new chemical is often administered to a patient in whom no standard biological response mechanism existed a priori. Thus, biologicals may be viewed in their physiologic role of correcting immunodeficiency states, as well as in the pharmacologic role of augmenting host responses and perhaps having direct antitumor effects. Clearly, it was rational to test chemical drugs to MTD and to treat just below this dose in a “kill or cure” approach to cancer therapy. Current evidence suggests the OBRM dose and the MTD dose should be determined in cancer biotherapy to properly design effective therapeutic trials. Once determined, the design of therapeutic trials for biotherapy may differ greatly from classical chemotherapy studies.

Biotherapy Trial Strategies Many strategies exist or can be envisioned for conducting clinical trials with new biologicals. Some of these strategies have already been utilized in the early-phase

46 testing of the interferons [4, 27, 59, 60, 103]. Two underlying principles are apparent wherein biologicals and drugs differ: when biologicals are administered, patients already have physiologic mechanisms and receptors that respond to them; and biologicals are derivatives of natural products of the mammalian or human genome, and may be expected to have less acute and chronic toxicity than drugs at similar biologically effective doses. However, when high doses are used to exploit a certain action of a biological, acute and chronic toxicities may appear. These two considerations will not necessarily apply to those BRM that are well-defined chemical entities and behave more in the manner of drugs with regard to toxicity.

Empirical Clinical Testing In many early interferon trials a set dose of a “natural” interferon was given to a variety of patients with neoplastic or viral disorders [57, 62, 76]. The chosen dose was the one expected, based on preclinical information or other clinical data, to be relatively nontoxic and yet to have sufficient biological effects to be therapeutically active. In this context, most early clinical trials with leukocyte interferon preparations were conducted at doses under five million units per day, although it became apparent later that doses up to 60 million units per day could be tolerated by the patients for a certain number of days. These trials were conducted as preliminary feasibility trials or pilot phase II trials to gain some information on the biological effects of the interferon preparations. Much of the information derived from them was anecdotal, but they yielded preliminary information about the biological effects and toxicities of alpha-interferons. Now that the development of biotherapy is proceeding more rapidly, other strategies are to be preferred.

Escalating dose Trials Using Different Groups of Patients Phase I trials for biologicals have been modeled after the standard phase I trial design used for drugs. Groups of patients (usually three to five) are treated with a particular dose of a new biological with a single route of administration [103]. These trials are begun with very low (sub-therapeutic) doses based on preclinical information, and the schedule is designed to increase the dose gradually to levels where toxicity occurs [55, 74]. Generally, new patients are entered at each higher dose level after all the patients have been entered on the previous dose and have received at least several treatments. In this way, each patient group provides toxicity

Development therapeutics and the design of clinical trials information before the higher dose is initiated in new patients. By utilizing different groups of patients at each dose level, cumulative toxicity for any one patient is avoided. Patients receive a predetermined number of doses at each dose level and then are followed. During this type of study, biological response modification and clinical toxicity are assessed [4, 48–50, 53]. Pharmacokinetics are also done in selected patients, so that the bioavailability can be determined [103]. The dose-escalation scheme can be a modified Fibonacci series, or some variation of this classical doseescalation method. The considerations involved in doseescalation methods dictated by drug toxicities do not necessarily apply to biologicals. Thus, some inves-tigators have used much faster dose escalations for biologicals. Often, the dose escalation schedule is rather empirical, the one selected being based on the best guess of the investigators involved. This phase I drug development strategy is based on historical data using new drugs and has several potential disadvantages. Since each patient receives only a particular dose for a defined period of time, it is highly likely that a large percentage of the patients will receive sub-therapeutic doses if antitumor effects are observed only at higher dose levels. Early clinical trials with biologicals have not produced severe cumulative toxicity. This clinical trial strategy, which was designed to avoid the cumulative toxic effects seen with drugs, is inappropriate for biotherapy. Since tolerance (tachyphylaxis) may develop for some effects (fever), entering different patients on progressively higher doses may expose patients to avoidable acute toxicities. Finally, the patients who are exposed to only one dose level are not individually assessed for biological response or for antitumor response over a wide dosage range. This could give them a greater opportunity for optimization of biological and therapeutic response [59]. This may be particularly true in the very-early-phase trials in which biological effects and antitumor effects are totally unknown.

Escalating-dose Trials within Individual Patients An alternative clinical trial strategy is the use of an escalating-dose trial within individual patients [58, 59, 74, 94]. There are several variations of this theme, but each involves starting patients at a low dose and escalating the dose in each patient to determine the biological response modifying effects and toxicities over a broad dose range. This clinical trial strategy is very conservative of patients, in that studies in small numbers of patients can give a large amount of information over a

Robert K. Oldham broad dose range in each biotherapy trial. In the context of this dose escalation, pharmacokinetics and biological response modification can be measured in each patient. It is important in such a clinical trial strategy that bioavailability studies be done and the information be available concomitantly with the study. Appropriate “wash-out” periods between doses can be utilized so that the administered biological does not circulate in increasing quantities as the trial continues. For example, with the interferon trials, one can determine the serum level after each dose and administer the next dose when interferon is no longer detectable. This allows the patient to avoid the possibility of severe acute toxic effects based on cumulative serum levels. Obviously, biological and therapeutic effects can still be cumulative and must be monitored by appropriate clinical and biological measurements throughout this type of trial. This strategy offers the possibility of low-, medium-, and high-dose therapy for the individual patient in the context of a single clinical trial. It maximizes the opportunity for the investigator to learn the optimal biological response modifying dose and the toxic dose, and perhaps to gain therapeutic information, all in the context of a single trial. Theoretically, rational maintenance regimens could be designed based on the observations made during the escalating dose trial for each patient. For monoclonal antibody, this strategy may be particularly important, in that the delivery of the monoclonal antibody to the tumor site may be the most important consideration in developmental therapeutics [25, 36, 54, 63, 94]. Giving a low dose and then progressively higher doses to the same patient, with subsequent determination of antibody localization, is a useful way of determining the correct dose for delivery of the antibody and/or its conjugates to the appropriate target organ in the context of a toxicity study. This trial design rationally ties targe-ting (delivery), toxicity, and therapeutic effects together in combined phase I/II studies in a manner perfectly appropriate for antibody and conjugates, in direct contradistinction to drug development [2, 3, 17, 18, 59, 96, 98]. In studies that employ escalating doses, a useful variation is to enter individual patients for a limited number of doses. With this trial design, the initial three or four patients may enter at the lowest dose level and progress through dose level 4 or 5, at which time the second group of patients may be entered at dose 3 and escalated upward in a manner that allows the second group to follow the first group in dosage escalation toward the MTD. A third group may be entered at dose level 6 and so on. This strategy allows one to avoid administering the full dose range to all patients, avoids most cumulative toxicity, and helps avoid sub-therapeutic doses.

47 It increases the patient’s therapeutic opportunity without undue risk of toxicity. This strategy is ethically preferable, most acceptable to patients and quite easy to describe in the informed consent [71].

Schedule In the initial clinical trials, the schedule of administration is generally empirical or is based on preclinical observations. Once there is information on bioavailability, different schedules of administration can be designed rationally. Both the bioavailability of the molecule and its biological effects are relevant. There are some biologicals that have a very short serum half-life (measured in a few seconds to minutes) but may produce much longer lasting biological effects. It may be useful to compare the biological effects and toxicities of biologicals when administered under conditions of rather constant exposure as against intermittent exposure in order to gain a preliminary sense of which schedule is most relevant [35, 74, 108]. Once these data are available, schedules of administration for phase II studies can be more rationally designed.

Route The route of administration and delivery of biotherapy to selected target organs is critical. There are data indicating that certain biologicals are inactivated, or poorly absorbed, when given intramuscularly or subcutaneously. For such biologicals intravenous administration is quite important. When data on bioavailability are not known from preclinical models, it is probably important to conduct early clinical trials with the intravenous route, since such trials can provide early data on serum pharmacokinetics and provide the best opportunity for broad biodistribution of the administered biological. It is important in phase I biotherapy trials to determine if serum levels are measurable and if biological effects are seen in the presence or absence of serum levels for agents given by any route of administration. There may be instances in which second mediators are involved, with useful biological effects occurring without apparent serum bioavailability. Effusions may contain both tumor cells and reactive immunological elements, in which case the administration of a biological into a restricted space such as the thoracic or peritoneal cavity might be appropriate. There are indications that certain immunomodulators may be effective in this setting [56]. Patients with tumors that remain confined to a single compartment for a prolonged period of time may offer unique opportunities for biotherapy [72, 88]. Ovarian cancer, with its propensity for

48 remaining localized in the abdominal peritoneum, may be ideal for evaluating the antitumor activity of cells [72], biologicals, and BRM in a relatively closed space. Interleukin-2 with activated cells is active when infused into selected anatomical sites and visceral cavities where tumor is present [44, 88]. It seems clear that targeting of monoclonal antibody and its conjugates may be improved by selective organ or region perfusion or infusion. Considerations for the design of early-phase trials in these spaces differ markedly from those using systemic administration.

Patient Selection Historically, patient selection for phase I drug trials has been broad, and patients bearing many tumor types have been entered into the trials. While this may be appropriate for drugs, and for selected lymphokines that act broadly on immunological responses or may act in a general antiproliferative manner across a broad spectrum of tumors, it is not appropriate for those biologicals that act more specifically. Thus, a monoclonal antibody that has been specifically designed to recognize a particular type of cancer can be appropriately tested only in patients with that type of cancer [45, 59]. In vitro determinations of specificity and activity may play a greater role in the selection of the patient populations for phase I biotherapy trials. The escalating-dose phase I trials, with the dose being escalated within individual patients, preselected on the basis of in vitro specificity and/or activity, appear to be most relevant and efficient for determining the distribution, biological effects, and toxicity of monoclonal antibodies. The same considerations may apply to certain lymphokines/cytokines, in which case selection as to activity may be on an individual patient basis. These trials may be more appropriately termed phase I/II trials. In fact, given the heterogeneity of cancer, both with respect to the specificity of recognition by antibody and with respect to activity by immunoconjugates and lymphokines/cytokines, in vitro determinations may play a major role in clinical trial design. Biological systems are diverse, and single patients may require specifically designed treatments when specificity and activity restrict the applicability of biotherapy. The design of early-phase [biotherapy] clinical trials needs to be radically changed [55, 58, 71]. There has been much speculation concerning the types of patients most appropriate for trials with biologicals. Many believe that these agents should be tested primarily in the adjuvant setting, where the tumor burden is quite small and the biological responses to be modified are still healthy [75]. Although this sort of strategy may be optimal, it is also prohibitively expensive

Development therapeutics and the design of clinical trials and very difficult to design. It would be virtually impossible to investigate a significant number of biologicals in phase II or III trials utilizing this type of clinical trial design. The number of patients required for trials in the adjuvant setting is enormous, in that the recurrence rate cannot be precisely predicted without a concurrent random control group. The lack of certainty for recurrence prompts ethical questions in designing phase II or III trials for these patients, since dose, route, schedule, OBRM and therapeutic efficacy have not been determined. It has now been well demonstrated that certain biologicals have activity in patients with bulky and resistant disease [4, 7, 13–16, 27, 57, 58, 67–68, 76, 89, 94, 108]. Even though biotherapy may be more effective, as chemotherapy and radiotherapy are, when the tumor burden is small, that does not mean that it is totally ineffective in patients with bulky disease. Given the large number of biologicals available to the clinic, there is a need to develop methods of rapid clinical testing in early-phase trials, and this will necessitate testing in patients with apparent disease [55, 57, 75, 108]. Indeed, the initial clinical trials with interferons, interleukins, monoclonal antibodies, and cellular therapies generally selected such patients with a good performance status and a reasonably functional immune system. These patients have shown evidence of biological response modification, and they have shown antitumor responses. Thus, such clinical trials can be used as indicators for biological activity of new agents [57, 67, 94].

Future Prospects Developmental therapeutics for biotherapies is well underway. From the inception of this field in 1980 to the present, a great number of new approaches have become available in biotherapy [42, 57, 71, 94, 108]. Unlike the field of drugs, where very large numbers of compounds are screened in a preclinical testing program and very few reach the clinic, a much higher percentage of the biologicals selected rationally and tested actually go on to clinical trials. This is due to selection based on the known physiologic activities of biologicals as opposed to random testing of chemicals in drug development. The strategies for these clinical trials need to be cost efficient, advantageous to the patient, ethical [71, 97], and scientifically interpretable to the clinician/scientist [64, 75]. Phase I strategies are most important in that they give the initial leads on which the design of early phase II and III trials are based. With proper selection clinical trial strategies, new biologicals can be more effectively screened and evaluated as potential anticancer agents [59, 71].

Robert K. Oldham

49

Biotherapy is the fourth modality of cancer treatment [57, 58, 84, 85, 86, 94]. These agents and this technology have far broader applications in medicine than cancer therapeutics. Given the large number of cloned biologicals and the virtually unlimited number of recombinant molecules that can be produced therefrom, along with unlimited variety of monoclonal antibodies that can now be produced, it is apparent that the coming years will produce new challenges for those involved in developmental therapeutics [33]. This tremendous expansion of agents and approaches available for cancer therapeutics will increase our opportunities and amplify the complexity in the preclinical evaluation of these agents and their translation to the clinic. The numbers of biologicals to be evaluated and their inherent selectivity call for new methods in the selection of the “most likely to succeed.” Additionally, the methods used historically by pharmaceutical manufacturers and the regulations established by governmental agencies for approving anticancer drugs are inhibitory to the rapid development of biotherapy [47, 55, 83]. Novel approaches will be necessary if these biologicals are to be effectively and rapidly translated to clinical trials [47, 55, 64, 95]. Alpha-interferon, IL-2 and monoclonal antibodies and their conjugates have anti-tumor effects, even in patients with bulky disease. This finding is likely to

emerge for other forms of biotherapy [42, 57, 59, 67, 71, 104, 108, 109]. This should give pause to those who believe the immunological dogma that biotherapy can only be active in minimal residual disease. Like chemotherapy and radiotherapy, biotherapy may be more active with lesser tumor burdens, but current data indicate that activity and hence selection of compounds for further study can be assessed in patients with advanced disease. The potential for the use of biotherapy is great. We are in a new era in cancer therapeutics. To develop biotherapy, we must begin to approach this new era in pharmaceutical research and to contemplate novel methods for the efficient and timely development of biotherapy rather than simply continuing in old paradigms (Fig. 1) [33, 55, 71, 82, 83]. Some would still say no new treatment can be judged without randomized, clinical trials. Such trials are valid in searching for small differences between a new treatment and an ethically acceptable control (standard treatment) [101]. Whether placebo controls are ever acceptable in cancer treatment is debatable; however, pilot studies without controls can be very useful even to the point of defining efficacy if the treatment effect is large and obvious. A recent and innovative “n of 1” trial also bears consideration in trials of biotherapy [35].

Preclinical Testing (in vitro/animal model) Phase I Clinical Trial Phase II Clinical Trial Phase III Clinical Trials

Unresponsive or poorly responsive neoplasm; Less than partial responses Partial responses to newer active single agents Increased partial responses and rare complete responses To some single and combined agents

Figure 1. Although radically different, chemotherapy and biotherapy share a systemic approach to cancer treatment. For those cancers that chemotherapy has been able to cure, reaching that goal required a sequence of steps in which new and increasingly more effective agents and combinations of agents had to be identified. Biotherapy can be expected to travel a similar path

Increased complete responses to more effective Combination therapy Increased survival in complete responders with or Without continued treatment during remission A portion of long-term survivors are cured

50

Development therapeutics and the design of clinical trials

We must not just continue to simply do what has been done historically [71]. Development therapeutics for biologicals certainly represents the kind of science Lewis Thomas described: It is hard to predict how science is going to turn out, and if it is really good science it is impossible to predict. This is in the nature of the enterprise. If the things to be found are actually new, they are by definition unknown in advance, and there is no way of telling in advance where a really new line of inquiry will lead. You cannot make choices in this matter, selecting things you think you’re going to like and shutting off the lines that make for discomfort. You either have science or you don’t, and if you have it you are obliged to accept the surprising and disturbing pieces of information, even the overwhelming and up heaving ones, along with the neat and promptly useful bits. It is like that.

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14. Dillman RO, Oldham RK, Tauer KW, et al. Continuous interleukin-2 and lymphokine activated killer cells for advanced cancer: an NBSG trial. J Clin Oncol 1991; 9:1233–1240. 15. Dillman RO, Church C, Oldham RK, et al. Inpatient continuous infusion Interleukin-2 in 788 cancer patients: the NBSG Experience. Cancer 1993; 71:2358–2370. 16. Dillman RO. The clinical experience with Interleukin-2 in cancer therapy. Cancer Biother 1994; 9(3):179–182. 17. Dillman RO, Dillman JB, Halpern SE, et al. Toxicities and side effects associated with intravenous infusions of murine monoclonal antibodies. J Biol Response Mod 1986; 5:73–84. 18. Dillman RO. Human antimouse and antiglobulin responses to monoclonal antibodies. Antibody, Immunoconj and Radiopharm 1990; 3:1–15. 19. Dillman RO Monoclonal antibodies for treating cancer. Ann Inten Med 1989; 111:593–603. 20. Dillman RO. Antibodies as cytotoxic therapy. J Clin Oncol 1994; 12:1497–1515. 21. Dillman RO. Magic bullets at last! Finally – approval of a monoclonal anbitody for the treatment of cancer!!! Cancer Biother Radiopharm 1997; 12:223–225. 22. Dillman RO. Radiolabeled anti-CD20 monoclonal antibodies for the treatment of B-cell lymphoma. J Clin Oncol 2002; 20: 3545–3557. 23. Ellenberg SS. Studies to compare treatment regimens: the randomized clinical trial and alternative strategies. J Am Med Assoc 1982; 246:2481–2482. 24. Fidler IJ, Berendt M, Oldham RK. Rationale for and design of a screening procedure for the assessment of biological response modifiers for cancer treatment. J Biol Response Modif 1982; 1:15–26. 25. Foon KA, Bernhard KA, Oldham RK. Monoclonal antibody therapy: assessment by animal tumor models. J Biol Response Modif 1982; 1:277–304. 26. Foon KA, Schroff RW, Bunn PA, et al. Effects of monoclonal antibody serotherapy in patients with chronic lymphocytic leukemia. Blood 1984; 64:1085–1093. 27. Foon KA, Sherwin SA, Abrams PG, et al. Treatment of advanced non-Hodgkin’s lymphoma with recombinant leukocyte alpha interferon. N Engl J Med 1984; 311:1148–1152. 28. Fost N. Consent as a barrier to research [editorial]. N Engl J Med 1979; 300:1272–1273. 29. Giardina SL, Schroff RW, Woodhouse CS, et al. Detection of two distinct malignant B-cell clones in a single patient using anti-idiotype monoclonal antibodies and immunoglobulin gene arrangement. Blood 1985; 66:1017–1021. 30. Ghielmini M, Schmitz SF, Cogliatti SB, et al. Prolonged treatment with rituximab in patients with follicular lymphoma significantly increases event-free survival and response duration compared with the standard weekly × 4 schedule. Blood 2004; 103: 4416–4423. 31. Goeddel D, Yelverton E, Ullrich A, et al. Human Leukocyte Interferon Nature (Lond) 1980; 287:411–416. 32. Guisti RM, Shastri KA, Cohen MH, et al. FDA drug approval summary: panitumumab (Vectibix). Oncologist 2007; 12:57–83. 33. Grillo-Lopez AJ. Regularity process for approval of biologicals for cancer therapy. Chapter in: principles of cancer biotherapy, 5th ed. Dordrecht, The Netherlands: Kluwer. 34. Gutterman JU, Rosenblum MG, Rios A, et al. Pharmacokinetic study of partially pure interferon in cancer patients. Cancer Res. 1984; 44:4164–4171. 35. Guyatt G, Sackett D, Taylor DW, et al. Determining optimal therapy – randomized trials in individual patients. N Engl J Med 1986; 314:889–892.

Robert K. Oldham 36. Hanna MG, Jr., Key ME, Oldham RK. Biology of cancer therapy: some new insights into adjuvant treatment of metastatic solid tumors. J Biol Response Modif 1983; 4:295–309. 37. Herberman RB, Thurman GB. Summary of approaches to the immunological monitoring of cancer patients treated with natural or recombinant interferons. J Biol Response Modif 1982; 2:548–562. 38. Horwitz RI, Feinstein AR. Improved observational method for studying therapeutic efficacy. JAMA 1981; 246:2455–2459. 39. Hurvitz SA, Timmerman JM. Current status of therapeutic vaccines for non-Hodgkin’s lymphoma. Curr Opin Oncol 2005; 17:432–440. 40. Hwang KM, Foon KA, Cheung PH, et al. Selective antitumor effect of a potent immunoconjugate composed of the A chain of abrin and a monoclonal antibody to a hepatoma-associated antigen. Cancer Res 1984; 44:4578–4586. 41. Kavvinavar FF, Hambleton J, Mass RD, et al. Combined analysis of efficacy: the addition of bevacizumab to fluorouracil/leucovorin improved survival for patients with metastatic colorectal cancer. J Clin Oncol 2005; 23:3706–3712. 42. Kirkwood JM, Ernstoff MS. Interferons in the treatment of human cancer. J Clin Oncol 1984; 2:336–352. 43. Knost JA, Sherwin SA, Abrams PG, et al. The treatment of cancer patients with human lymphoblastoid interferon: a comparison of two routes of administration. Cancer Immunol Immunother 1983; 15:144–151. 44. Lembersky B, Baldisseri M, Seski J, et al. Phase IB study of intraperitoneal (IP) interleukin-2 (IL-2) for refractory ovarian cancer (OC). Proc Am Assoc Cancer Res 1990; 31:277. 45. Lewko WM, Ladd PA, Pridgen D, et al. Tumor acquisition propagation and preservation: culture of human colorectal cancer. Cancer 1989; 64:1600–1608. 46. Liao SK, Meranda C, Avner BP, et al. Immunohistochemical phenotyping of human solid tumors with monoclonal antibodies in devising biotherapeutic strategies. Cancer Immunol Immunother 1989; 28:77–86. 47. Madden BJ. A clinical trial for the FDA’s clinical trial process. Cancer Biother Radiopharm 2005; 20(6):569–578. 48. Maluish AE, Leavitt R, Sherwin SA, et al. Effects of recombinant alpha interferon on immune function in cancer patients. J Biol Response Modif 1983; 2:470–481. 49. Maluish AE, Ortaldo JR, Sherwin SA, et al. Changes in immune function in patients receiving natural leukocyte interferon. J Biol Response Modif 1983; 2:418–427. 50. Maluish AE, Ortaldo JR, Conlon JC, et al. Depression of natural killer cytotoxicity following in vivo administration of recombinant leukocyte interferon. J Immunol 1983; 131:503–507. 51. Miller RA, Maloney DG, Warnke R, et al. Treatment of B cell lymphoma with monoclonal anti-idiotype antibody. N Engl J Med 1982; 306:517–522. 52. Nowinski RC, Tam MR, Goldstein LC, et al. Monoclonal antibodies for diagnosis of infectious disease in humans. Science 1983; 219:637. 53. Oldham RK. Toxic effects of interferon. Science 1982; 219:902. 54. Oldham RK. Monoclonal antibodies in cancer therapy. J Clin Oncol 1983; 1:582–590. 55. Oldham RK. Biologicals: new horizons in pharmaceutical development. J Biol Response Modif 1983; 2:199–206. 56. Oldham RK. Guest editorial: biological response modifiers. J Natl Cancer Inst 1983; 70:790–796. 57. Oldham RK. Biologicals and biological response modifiers; fourth modality of cancer treatment. Cancer Treat Rep 1984; 68:221–232. 58. Oldham RK. Biologicals and biological response modifiers: new approaches to cancer treatment. Cancer Invest 1985; 3:53–70. 59. Oldham RK. Biologicals and biological response modifiers: the design of clinical trials. J Biol Response Modif 1985; 4:117–128.

51 60. Oldham RK. Biologicals and biological response modifiers: new strategies for clinical trials. In: Finter NB and Oldham RK, eds. Interferons, IV. Amsterdam: Elsevier, 1985; 235–249. 61. Oldham RK. Interferon: a model for future biologicals. In: Burke D, Cantell K, Gresser I, De Maeyer E, Landy M, Revel M, Vilcek J, eds. Inf. VI. New York: Academic Press, 1985; 127–143. 62. Oldham RK. Biologicals for cancer treatment: interferons. Hospital Practice 1985; 20:72–91. 63. Oldham RK, Foon KA, Morgan AC, et al. Monoclonal antibody therapy of malignant melanoma: in vivo localization in cutaneous metastasis after intravenous administration. J Clin Oncol 1984; 2:1235–1242. 64. Oldham RK. Therapeutic monoclonal antibodies: effects of tumor cell heterogeneity. In: Present status of nontoxic concepts in cancer therapy. Cancer symposium (Germany). Basel: Karger, 1986. 65. Oldham RK. Monoclonal antibody therapy. In: Chiao JW, ed. Biological response modifiers and cancer research. New York:Marcel Dekker, 1988; 40:3–16. 66. Oldham RK. Set my factors free. Mol Biother. 1990; 2(4):194–195. 67. Oldham RK. Cancer biotherapy: principles and practice. New York: Marcel Dekker, 1991. 68. Oldham RK, Dillman RO, Yannelli JR, et al. Continuous infusion interleukin-2 and tumor derived activated cells as treatment of advanced solid tumors. An NBSG trial. Mol Biother 1991; 3(2):68–73. 69. Oldham RK. Custom tailored drug immunoconjugates in cancer therapy. Mol Biother 1991; 3(3):148–162. 70. Oldham RK. The cure. Franklin, TN: Pulse Publications, 1991. 71. Oldham RK. BioEthics: opportunities, risks and ethics: the privatization of cancer research. Franklin, TN: Media America, 1992. 72. Oldham RK, Greco FA. Brief intensive chemotherapy and second look laparotomy in advanced ovarian carcinoma. In: William CJ, Whitehouse M, eds. Recent advances in clinical oncology. London: Churchill Livingstone, 1982; 165–185. 73. Oldham RK, Morgan AC, Woodhouse CS, et al. Monoclonal antibodies in the treatment of cancer: preliminary observations and future prospects. Med Oncol Tumor Pharmacother 1984; 1:51–62. 74. Oldham RK, Sherwin SA, Maluish A, et al. A phase I trial of immune interferon: a preliminary report. In: Goldstein AL, ed. Thymic hormones and lymphokines. New York: Plenum Press, 1984; 497–506. 75. Oldham RK, Smalley RV. Immunotherapy: the old and the new. J Biol Response Modif 1983; 2:1–37. 76. Oldham RK, Smalley RV. The role of interferon in the treatment of cancer. In: Zoon KC, Noguci PD, Lui TY, eds. Interferon: research, clinical application and regulatory consideration. New York: Elsevier, 1984; 191–206. 77. Oldham RK, Thurman GB, Talmadge JE, et al. Lymphokines, monoclonal antibodies and other biological response modifiers in the treatment of cancer. Cancer 1984; 54:2795–2810. 78. Oldham RK, Patient-funded cancer research. N Engl J Med 1987; 316:46–47. 79. Oldham RK. Drug development: who foots the bill? Bio/technology 1987; 5:648. 80. Oldham RK. Who pays for new drugs? Nature 1988; 332(28):795. 81. Oldham RK, Avent RA. Clinical research: who pays the bills? Oncology Issues 1989; 4(2):13–14. 82. Oldham RK. Clinical research in cancer: a time for consensus. Pharm Exec 1989; July. 83. Oldham RK. Regulatory hierarchies (editorial). Mol Biother 1988; 1(1):3–6. 84. Oldham RK. Biotherapy: the fourth modality of cancer treatment. Cancer: perspective for control symposium. J Cell Physiol Suppl 1986; 4:91–99.

52 85. Oldham RK. Biotherapy: the fourth modality of cancer treatment. In: Mak TW, Sun TT, eds. Cancer: perspective for control symposium. New York: Alan R. Liss, 1986; 91–99. 86. Oldham RK. The government-academic “industrial” complex. J Biol Response Modif 1986; 5:109–111. 87. Oldham RK. The cure for cancer. J Biol Response Modif 1985; 4:111–116. 88. Oldham RK, Bartal AH, Yannelli JR, et al. Intra-arterial and intracavitary administration of lymphokine activated killer cells in patients with advanced cancer: feasibility and laboratory results. Proc AACR (abstr) 1988; 29:396. 89. Oldham, RK, Lewko W, Good R, et al. Growth of tumor derived activated T cells for the treatment of cancer. Cancer Biother 1994; 9(3):211–224. 90. Oldham RK. Fundamentally different. Cancer Biother Radiopharm 1999; 14:413–15. 91. Oldham RK. Cracking the FDA code. Wall Street J Op/Ed. 2.2.2001. 92. Oldham RK. Informal opinions: editorial introduction. Cancer Biother Radiopharm 2002; 17:247. 93. Oldham RK. FDA trials cost lives. Wall Street J Op/Ed. 3.3.2002. 94. Oldham RK, Dillman RO. Monoclonal antibodies in cancer therapy: twenty-five years of progress. JCO. 2008; 26(11):1774–1777. 95. Oldham RK, Dillman RO. Gold standard or wrong standard? Cancer Biother Radiopharm 2004; 17(6):271–272. 96. Orr DW, Oldham RK, Lewis M, et al. Phase I trial of Mitomycin-C immunoconjugate cocktails in human malignancies. Mol Biother 1989; 1(4):229–240. 97. Relman AS. The ethics of randomized clinical trials: two perspectives [editorial]. N Engl J Med 1979; 300:1272. 98. Ricart AD, Tolcher AW. Technology insight: cytotoxic drug immunoconjugates for cancer therapy. Nat Clin Prac Oncol 2007; 4:1379–1389.

Development therapeutics and the design of clinical trials 99. Romond EH, Perez EA, Bryan J, et al. Trastuzumab plus adjuvant chemotherapy for operative HER2-positive breast cancer. N Engl J Med 2005; 353:1673–1684. 100. Sandler A, Gray R, Perry MC, et al. Paclitaxel-carboplatin alone or with bevcizumab for non-small-cell lung cancer. N Engl J Med 2006; 355:2542–2550. 101. Schafer A. The ethics of randomized clinical trials. N Engl J Med 1982; 307:719–724. 102. Sears HF, Herlyn D, Steplewski Z, Koprowski H. Effects of monoclonal antibody immunotherapy on patients with gastro-intestinal adenocarcinoma. J Biol Response Modif 1984; 3:138–150. 103. Sherwin SA, Knost JA, Fein S, et al. A multiple dose phase I trial of recombinant lymphocyte alpha interferon in cancer patients. JAMA 1982; 248:2461–2466. 104. Slamon DJ, Leyland-Jones B,Shak S, et al. Use of chemothe-rapy plus a monoclonal antibody against HER2 for metastatic breast cancer that overexpresses HER2. N Engl J Med 2001; 344: 783–92. 105. Smalley RV, Oldham RK. Interferon as a biological response modifying agent in clinical trials. J Biol Response Modif 1983; 2:401–409. 106. Sylvester RJ, Pinedo J, De Pauw M, et al. Quality of institutional participation in multicenter clinical trials. N Engl J Med 1981; 305:852–855. 107. Weiss DG, Williford WO, Collins JF, Binham SF. Planning multicenter clinical trials; a biostatistician’s perspective. Controlled Clin Trials 1983; 4:53–64. 108. West WH, Tauer KW, Yannelli JR, et al. Constant infusion recombinant interleukin-2 in adoptive immunotherapy of advanced cancer. N Engl J Med 1987; 316(15):898–905. 109. Vitetta ES, Krokick KA, Miyama-Inaba M, et al. Immunotoxins: a new approach to cancer therapy. Science 1983; 219:644–649. 110. Zelen M. A new design for randomized clinical trials. N Engl J Med 1979; 300:1242–1246.

4

Recombinant proteins and genomics in cancer therapy KAPIL MEHTA, BULENT OZPOLAT, KISHORCHANDRA GOHIL, AND BHARAT B. AGGARWAL

Abbreviations ADA, adenosine deaminase; AML, acute myeloid leukemia; bFGF, basic fibroblast growth factor; CML, chronic mylogenous leukemia; CSF, colony-stimulating factor; EGF, epidermal growth factor; EPO, erythropoietin; FDA, Food and Drug Administration; HIV, human immunodeficiency virus; IFN, interferon; IL, interleukin; LIF, leukemia inhibitory factor; MAb, monclonal antibody; PDGF, platelet-derived growth factor; PE, Pseudomonas exotoxin; PEG, polyethylene glycol; TGF, transforming growth factor; TNF, tumor necrosis factor

Introduction Recently published sequence of the complete human genome represents a major milestone in the era of the modern molecular biology [318, 132]. The sequencing of approximately 3.2 billion nucleotides of the human genome that is estimated to contain about 20,000–25,000 protein-encoding genes signifies the first step down the long road. Gene identification does not necessarily translate into an understanding of gene function. Although mapping and cloning of several genes have linked them to heritable genetic disorders, the normal function of a majority of these genes remains unknown. Recombinant DNA technology has made it possible to generate large amounts of many biologically active proteins and to delineate their functions. The novelty of recombinant technology is the precision and efficiency with which scientists can manipulate single gene. The ability to isolate human genes and insert them into microorganisms, which then produce human proteins, thereby serving as biological factories, has revolutionized the field of biology. Interferons have special significance to recombinant DNA technology as paradigm modifiers of immune response. The interest in the therapeutic potential of interferon against cancer and viral diseases has served as catalyst to the emerging recombinant DNA industry. Despite its great promise as an antiviral agent, the clinical application of interferon had been rather slow, mainly

R.K. Oldham and R.O. Dillman (eds.), Principles of Cancer Biotherapy, © Springer Science + Business Media B.V. 2009

because of the lack of methods for producing adequate amounts of the pure protein. Interest in interferon beyond the field of virology began in the early 1960s, when workers began to recognize its growth-inhibitory and immune-activation properties. During the 1960s and early 1970s, reports of interferon’s antiviral and antitumor activity in laboratory animals and humans stirred up this interest and several groups decided to purify human interferon for clinical use. The first practical method of producing sufficient quantities of interferon was developed by Cantell et al. [31]. They were able to isolate 100–200 mg of interferon from 1,000 l of starting material that contained 2–5 kg of other contaminating proteins. The purified material had a specific activity of greater than 108 U/mg protein [69] and was sufficient to treat only a few patients [282], but the initial clinical results stimulated wider interest in expanding production of interferon for more extensive clinical trials. Enthusiasm intensified when interferonalpha was successfully cloned and the purified recombinant protein became available [225, 226]. The first trial to test dose levels and side effects of the purified bacterial product in human beings began in 1981 [227, 112]. The availability of pure recombinant protein led researchers to crystallize interferon, the first step toward analysis of the protein’s three-dimensional structure by X-ray crystallography. This permitted the production of individual molecular species of interferon free from other species and other proteins that were simultaneously induced in human cell cultures. By using this technique, our knowledge of the varied biological properties of interferons, previously determined with relatively crude preparations, has been confirmed and extended.

Isolation, Cloning and Expression of Genes A gene is a defined region of a chromosome comprising a specific sequence or part of a long polynucleotide. It codes for some specific function or characteristic

53

54

Recombinant proteins and genomics in cancer therapy GENE -A-G-A -T-C-T

a

b Intron

d

c

C-T-A-G- G-A-T-C- -

exon

Eukaryotic DNA Genome

Transcription a

b

c

d Primary RNA transcript

a

b

c

d Splicing

a

b

c

d

mRNA

Translation NH2

------

COOH

Protein

Protein processing, folding

Mature functional protein

Figure 1. The organization of a eukaryotic gene and processing of the RNA transcript

(phenotype) of a cell. The eukaryotic genome contains up to 109 nucleotides in 50–100,000 genes [40, 97]. To study the events in such a complex system it is necessary to be able to isolate and study a single gene in a purified form. Molecular cloning provides a method for isolating a single discrete segment of DNA from a population of genes and amplifying the DNA segment to produce enough pure material for chemical, genetic, and biological analysis. Cloning and expression of foreign genes has permitted access to such complex biological mechanisms as RNA splicing, oncogene dynamics and antibody diversity. It has also been the foundation for the new biotechnology industry. The organization of genes in higher organisms is more complex than in bacteria and viruses. The linear array of information in a complex gene contains one or more stretches of non-coding sequences, called introns. The remaining sequences, which encode information for proteins, are called exons. When these genes produce a protein, the DNA is transcribed into a large RNA molecule from which the introns are removed; this

mRNA molecule is then translated to produce the corresponding protein (Fig. 1). The organization of bacterial genes is simpler. They do not produce the enzymes necessary for RNA splicing, so a eukaryotic gene containing introns, if introduced into a bacterial cell as in recombinant techniques, will not be properly expressed. This problem can be circumvented by making a DNA copy (cDNA) from the appropriate mRNA by using the enzyme reverse transcriptase (Fig. 2). As an alternative, the DNA can be fragmented at specific target sequences with the help of restriction endonucleases [249]; the DNA fragment that contains the gene of interest is inserted into the purified DNA genome of a self-replicating genetic element, generally a virus or a plasmid. A DNA fragment containing a human gene, for example, when inserted into such a virus or plasmid, can be joined in a test tube to the chromosome of a bacterial cell. Starting with only one such recombinant DNA molecule which can infect only a single cell, the normal replication mechanism of the virus can produce more than trillion identical molecules in

Kapil Mehta et al.

55 Genomic DNA GENE

Restriction nuclease digestion ------

-----Transcription

mRNA Reverse Transcriptase

DNA Fragments

Alkali degradation Single-stranded DNA DNA Polymerase

Complementary DNA (cDNA)

pBR322

cDNA molecules are joined to vector DNA for propagation in bacteria

Selection of clone(s) carrying desired cDNA sequence, using a nucleic acid or antibody probe

Expression of cloned gene in host organisms such as bacteria, yeast or mammalian cells Figure 2. Gene cloning from mRNA or genomic DNA

less than a day, thereby amplifying the amount of the inserted human DNA fragment by the same factor, making it possible to infect millions of cells. The virus or plasmid used in this way is known as a cloning vector, and the DNA propagated by insertion into it is said to have been cloned. Cloning the gene or cDNA encoding a particular protein is only the first of many steps needed to produce a recombinant protein for medical and industrial use. Expression of foreign genes in a host organism requires vectors which contain specific control sequences governing transcription and efficient splicing of RNA. The most popular expression systems used for this purpose are the bacteria Escherichia coli and Bacillus subtilis, yeast, cultured insect cells and mammalian cells. The choice of expression system depends on the properties of the protein to be produced. Bacterial cells are most

common and convenient host organisms. They are simple to grow, have short generation times, provide large yields, and are most cost-effective. Particularly in the case of B. subtilis, the cells can be induced to secrete the product into culture medium, which facilitates the purification of the cloned protein. However, there are some disadvantages of using bacterial cells for gene expression (Table 1). Though most proteins are expressed in large amounts in bacteria, some of them fail to fold properly, leading to formation of insoluble ‘inclusion bodies.’ Protein extracted from these inclusion bodies is sometimes biologically inactive. Small proteins can be refolded into their native form, but larger ones containing several cysteine residues, in general, stay inactive, most likely because of the improper formation of disulfide bridges. Moreover, the expressed foreign protein is sometimes toxic to the bacteria, so that the culture

56

Recombinant proteins and genomics in cancer therapy

Table 1. Posttranslational processing of proteins in various expression systems Event

Bacteria

Proteolytic Cleavage Glycosylation Secretion Folding Phosphorylation Acylation Amidation % yield

+/−

Yeast

Insect cells

Mammalian cells

+

+

− +/− +/− −

+ + +/− +

+ + + +

+ + + +

− − 1–5%

+ − 1%

+ + 30%

+ + <1%

producing the protein cannot be grown to high cell density. This problem can be overcome by using an inducible promoter that is turned on to begin the transcription of the foreign gene only after the culture has been grown. Unlike eukaryotic cells, bacterial cells lack enzymes that catalyze posttranslational modifications of proteins such as phophorylation, acylation and glycosylation. These posttranslational modifications are sometimes essential for the normal functioning of a protein. Yeast cells may be preferable to bacteria for the production of some proteins biological by recombinant DNA procedures. Yeast is a simple eukaryote that resembles mammalian cells in many ways but, like bacterial cells, can be grown conveniently and economically. Yeast cells are capable of catalyzing many post-translational modifications that are found on mammalian proteins [126]. Also, they process the signal peptides needed for the secretion of protein and thus can be induced to secrete certain proteins into the growth medium for harvesting. Moreover, unlike bacteria, yeast cells do not have endotoxins. However, yeasts do produce active proteases that can degrade the foreign proteins, thereby reducing the yield of the final product. To overcome this problem, the construction of yeast strains with deleted protease genes is being attempted. Until recently, the expression of a biologically active protein from a complex eukaryotic gene in large amounts was a problem. The problems with prokaryotic expression systems have already been described. Even in yeast (eukaryotic) expression systems, the low biological activity of complex eukaryotic proteins remains a common problem. Mammalian expression systems provide all the post-translational modifications that may be necessary for full activity of eukaryotic proteins, but the yields from these systems are generally much lower than can be obtained from E. coli or yeast. Recently, protein yields as high as 10 mg/l have been obtained by

using mammalian expression systems [61], but this process is often lengthy and costly. Expression of foreign proteins in cultured insect cells by baculovirus vectors is an alternative to this problem. This relatively new system is becoming the system of choice for expressing mammalian and viral proteins. Baculovirus promoters are among the strongest known and can drive the expression of target genes at high levels (1–500 mg/l). The baculovirus expression system offers several other advantages over prokaryotic, yeast, and mammalian expression systems [178]. Some of the advantages include: high-level expression, correct folding, the ability to catalyze post-translational modifications like mammalian cells (Table 1), quick and easy growth in monolayers or suspension cultures without CO2, and safest – they do not infect humans, animals or plants. More than 400 different proteins have been expressed by using baculovirus vectors, and in most cases the protein produced is similar in structure, biological activity and immunological reactivity to the authentic protein [177]. Although the cost of culturing insect cells is currently more than that of culturing bacteria or yeast, it is still significantly less than that of culturing mammalian cells. Despite the significant advantages of producing human proteins in heterologous host cells, in some cases the best method for producing a mammalian protein is a mammalian cell system. Transient expression in mammalian cells is often used to check the function of a newly cloned gene and as a quick method to assess the function of engineered proteins. The extracellular domains of cell-surface receptors have been engineered for secretion from cells by introduction of a stop codon into the gene before the sequence of the transmembrane domain. These soluble receptors, as we will discuss later in this chapter, are valuable reagents for the study of ligand binding and for screening receptor agonists or antagonists that may eventually be used as therapeutics themselves. Although transient transfections yield enough protein for laboratory experiments, stably integrated amplified genes in mammalian cells are necessary for large-scale production of proteins [2]. With this goal in mind, great improvements have been made in recent years in identification of appropriate promoters, vectors, transformation protocols and host cell systems.

Recombinant Proteins as Cancer Therapeutics Biotherapy, as an alternative to the rigorous cytotoxic regimens used in the treatment of various malignant disorders, offers distinct and attractive advantages over

Kapil Mehta et al.

57

Antiproliferative Anti-angiogenic IFN TNF TGF Amphiregulin Oncostatin M Lymphotoxin FAS/APO ligand

Differentiation CSFs IFN-gamma TNF LIF EPO

Anti-VEGF antibody Endostatin Angiostatin

Approaches to the Biological Therapy of Cancer

Immunomodulatory

Cytotoxic Immunotoxins antibodies Fas/APO

IFNs TNF

Figure 3. Model for recombinant DNA-derived protein therapeutics for cancer

conventional chemotherapy. Biological therapy is based on the principle of stimulating the body’s own immune response and/or using biological substances against a disease. A perception of the malignant cell as one whose differentiation has been blocked due to the lack, deficiency or mutation of some key element led to the emergence of a biological therapy. The strategy of biological therapy contrasts with the immediate cell death induced by cytotoxic drugs, where there is no attempt to restore homeo-stasis. Biotherapy may offer the opportunity to use relatively nontoxic agents, the body’s own elements, to correct the underlying problem. It has long been recognized that the immune system plays a pivotal role in the patient’s response to disease. Therefore, recent cancer therapies have been directed at modulation of components of the immune system (Fig. 3). In particular, “immune messengers” or cytokines may play a vital role in regulating host antitumor defense mechanisms. Knowledge of cytokines and their functions is expanding rapidly [3, 6, 15, 122, 123, 126, 135, 179]. In the following section we will discuss the potential role of cytokines in the treatment of malignant disease.

on target cells and regulate the proliferation, differentiation and metabolism of either the same cell (autocrine) or another cell (paracrine). Cytokines are different from endocrine hormones in that they are produced by any number of different cells rather than by specialized glands. Different cytokines exhibit considerable overlap in their biological activities. Because of the advent of recombinant DNA technology, cytokines have become available in highly pure form and in sufficient quantities. This has accelerated the elucidation of in vitro and in vivo biological activities of these proteins and led to their rapid testing in the patients as therapeutic agents for the treatment of cancer. The cytokines that have been shown to have therapeutic potential in cancer include the interferons (IFNs), interleukins (ILs), colony- stimulating factors (CSFs), and tumor necrosis factors (TNF). Table 2 lists some recombinant cytokines that are currently being used for the treatment of malignant diseases.

Cytokines

Interferons are a family of regulatory glycoproteins produced by many cell types in response to viral infections and a variety of mitogenic and antigenic stimuli. Three major classes of IFNs have been described: IFN-α and IFN-β, which share components of the same receptor

In general, cytokines are low molecular weight (10– 50 kDa) proteins secreted by cells of the immune system that bind with great specificity and affinity to receptors

Interferons

58

Recombinant proteins and genomics in cancer therapy

Table 2. Cytokines Approved or in Development for Human usea Cytokine

Target disease

EPO

Countries approved

r.Protein biotherapeutics approved by FDA for human use IFN-α Chronic myelogenous leukemia USA, Europe, Japan Hairy cell leukemia USA, Europe, Japan AIDS-related Kaposi’s sarcoma USA Chronic non-A/non-B/C USA hepatitis Condylomata acuminata USA Lymphoma Essential thrombocythemia Melanoma Certain solid tumors Multiple myeloma Acute hepatitis B IFN-β Renal cell carcinoma Europe Advanced solid tumors Soft tissue carcinoma Adult T cell leukemia IFN-γ Chronic granulomatous USA disease (CGD) Advanced solid tumors Renal cell carcinoma Adult T cell leukemia Chronic myelogenous leukemia Lepromatous leprosy IL-2 Renal cell carcinoma Europe Metastatic melanoma Japan, Europe Advanced malignancies USA G-CSF Non-myeloid malignancies associated with chemotherapy-induced myelosuppression Myelodysplastic syndromes Severe chronic neutropenia (cyclic, idiopathic, congenital) Acute myelogenous leukemia Bone marrow transplantation GM-CSF Autologous bone marrow USA, Japan transplantation for nonHodgkin’s lymphomas, Hodgkin’ s disease, acute lymphocytic leukemia Allogeneic bone marrow transplantation for leukemias Myelodysplastic syndromes/ aplastic anemia Cancer chemotherapy associated myelosuppression Acute myelogenous leukemia AIDS, anti-AIDS drug treatment Associated myelosuppression

Anemia associated with chronic USA renal failure Malignancy, chemotherapy AIDS, AZT treatment rheumatoid arthritis anemia of prematurity Autologous blood donation prior to surgery Compensation of surgical blood loss Hepatitis B hepatomas surface antigen

r.Protein biotherapeutics currently under clinical trials IL-1αβ Malignant disorders Bone marrow transplantation Severe aplastic anemia Allotransplant patients IL-3 Advanced neoplasms Secondary hematopoietic failure Bone marrow recovery Breast cancer IL-4 Metastatic renal cell carcinoma Metastatic breast carcinoma Metastatic melanoma Disseminated cancer Advanced malignancies IL-7 Refractory solid tumors Metastatic melanoma Metastatic kidney cancer IL-11 Relapsed non-Hodgkin lymphoma Leukemia Melanoma IL-12 Lymphoma Advanced solid tumors (melanoma, neuroblastoma, breast cancer) IL-18 Ovarian carcinoma IL-21 Melanoma Ovarian carcinoma IL-29 Hepatitis C (associated with hepatocellular carcinoma) CSF-1 Endometrial carcinoma IFN-α Metastatic renal carcinoma, Metastatic melanoma Multiple myeloma Lymphoma TNF-α Advanced neoplasms Reduction of ovarian ascites M-CSF Solid tumors Breast cancer Fungal infections Acute myelogenous leukemia IL-1 AML, CML, sepsis, septic shock Receptor antagonist a

Disease in bold indicates approved use of cytokine.

Kapil Mehta et al.

59

and are referred to as type I; and IFN-γ, which uses a separate receptor system and is referred to as type II (Table 3). Additional IFNs have been discovered, but they are not well characterized [259]. Crude IFN was probably the first cytokine used in patients and was shown to delay recurrent growth of tumors in patients who had undergone surgery for osteogenic sarcoma [282, 283]. Pharmacological doses of partially purified IFN-α were reported to induce regression of tumors in significant numbers of patients with metastatic breast cancer, low-grade lymphoma, or multiple myeloma [110]. In 1981, IFN-α was successfully cloned by two groups, and the purified protein was immediately tested in the clinic. This was the first study of a recombinant cytokine in patients with cancer and, for the most part, the biological activity seen with the partially pure natural form was reproduced with the recombinant DNAderived form [111]. Treatment with IFN-α was also Table 3. Recombinant DNA-derived proteins relevant to treatment of cancer Cytokine

Receptor(s) used

Reference

Interferon-α (IFNα) Interferon-ß (IFN-β) Interferon-γ (IFN-γ) Transforming growth factor-β (TGF-β) Thymosin α1 Epidermal growth factor (EGF) Platelet derived growth factor (PDGF) Fibroblast growth factor (Basic) (bFGF) Fibroblast growth factor (Acidic) (aFGF) Transforming growth factor-a (TGF-α) Insulin like growth factor(IGF-I & II) Hepatocyte growth factor (HGF) Macrophage colonystimulating factor Granulocyte colonystimulating factor GM-colony stimulating factor Leukemia inhibitory factor (LIF) Stem cell factor (SCF) Erythropoietin (EPO) B cell growth factor Hepatitis B surface antigen

IFNα/β-R IFNα/β-R IFNγ-R TGF-β -R1 and -RII

[2, 225] [293] [103, 241, 261] [2, 56]

EGF-R

[329] [2, 101, 261]

PDGF-RI and RII

[116]

FGF-R

[98]

FGF-R

[98]

EGF-R

[57]

IGF-RI and IGF-RII

[54]

HGF-R

[199]

M-CSF-R

[2, 145]

G-CSF-R

[2, 120, 276]

GM-CSF-R

[2, 335]

LIF-R

[2, 99]

SCF-R EPO-R BCGF-R ?

[2, 331] [2, 78] [260] [65, 314]

shown to induce remissions in some patients with welldifferentiated B-cell tumors [282]. The most remarkable effects of recombinant IFN-α were observed in patients with hairy cell leukemia [237]. Treatment with partially purified or recombinant IFN-α suppressed peripheral blood cell production and rapidly increased platelet counts in these patients [112]. Their immune status improved and the number of leukemia cells in the bone marrow and blood declined. These patients stopped having opportunistic infections and required no further platelet and erythrocyte transfusions. These studies led to the approval of IFN-a for treatment of hairy cell leukemia in June 1986 by the United States Food and Drug Administration (FDA), an action adopted by regulatory agencies from 31 other countries. The mechanisms of IFN-α action in the compromised survival of the patients with hairy cell leukemia are not fully understood but may include differentiation, cell-cycle arrest and/or apoptosis. Other B-cell neoplasms also show variable degrees of sensitivity to IFN-α [110, 111, 282]. In patients with multiple myeloma or low-grade lymphoma, the cytokine often has demonstrated a positive clinical impact on survival when combined with chemotherapy [182, 272, 275]. Clinical results with IFN-α in patients with chronic myelogenous leukemia (CML) have been rather interesting. During the chronic phase of CML, IFN-α treatment causes hematologic remission [112]. Approximately 75% of the patients in the benign phase of the disease achieve complete normalization of blood counts. Moreover, IFN-α had the astonishing capacity to suppress selectively the cells bearing the Philadelphia chromosome, resulting in partial or complete restoration of the normal clone [290]. While showing great promise for leukemia, IFN-α therapy of solid tumors has been rather discouraging. Only 10–15% of patients with renal cell carcinoma or malignant melanoma undergo regression in response to IFN-α. However, the responses of carcinoid tumors to the cytokine were encouraging. A majority of patients showed improvement in symptoms, and a smaller fraction experienced tumor regression [210]. Both squamous and basal cell carcinomas of the skin show sensitivity to IFN-α, as a single agent or in combination with retinoids [170, 229]. Mycosis fungoides, a malignancy of the T helper cells, is also sensitive to IFN-α alone or with other modalities including retinoids [140, 247]. Kaposi’s sarcoma, an angioproliferative disease that commonly develops in individuals infected with human immunodeficiency virus (HIV), has responded well to IFN-α therapy: 40% of patients experienced significant regression of lesions [282]. This work led to the approval of

60 IFN-α in the U.S. and 21 other countries for the treatment of AIDS-related Kaposi’s sarcoma. After isolation of its gene and 10 years’ work identifying several of its biological activities, IFN-α was tested in human subjects for a wide variety of diseases including cancer. It was found to have impressive effects against chronic granulomatous disease, leading to its approval by the FDA for human use [298]. More recently, IFN-β was approved for treatment of ambulatory patients with relapsing/remitting multiple sclerosis [4]. Clinical toxic effects associated with administration of IFNs and other cytokines are summarized in Table 4. The IFNs, like most other cytokines, are produced by the body to act locally. When used as a systemic pharmaceutical, they can have substantial toxic effects [282].

Recombinant proteins and genomics in cancer therapy Table 5. Interleukins with relevance to cancer treatment Interleukin

Receptor

Reference

Interleukin-1-α (IL-1α)

IL-1R type I; IL-1R type II IL-1R type I; IL-1R type II IL-1R type I; IL-1R type II IL-2R . α, IL-2R . β, IL-2R .γ IL-3R . α, IL-3γ IL-4R, IL-2R . γ IL-5R . α, IL-5R . γ IL-6R, gp130 IL-7R (CDw127), IL-2R . γ IL-8R, Type I & Type II IL-9R, IL-2R R . γ; IL-10R1; IL-10R2 IL-11R, gp130 IL-12R IL-13R . α, IL-4R, IL-2R . γ IL-15Rα, IL-2R . β, IL-2R . γ CD4 IL-17R IL-18R

[59]

Interleukin-1-β (IL-1ß) Interleukin-1 receptor antagonist Interleukin-2 (IL-2) Interleukin-3 (IL-3) Interleukin-4 (IL-4) Interleukin-5 (IL-5) Interleukin-6 (IL-6) Interleukin-7 (IL-7) Interleukin-8 (IL-8)

Interleukins The interleukins are a family of cytokines that are essential to both cellular and humoral immune responses. To date, at least 34 interleukins have been identified and cloned (Table 5). Many of these molecules exhibit

Interleukin-9 (IL-9) Interleukin-10 (IL-10) Interleukin-11 (IL-11) Interleukin-12 (IL-12) Interleukin-13 (IL-13) Interleukin-15 (IL-15)

Table 4. Common toxic effects associated with administration of cytokines Fever Chills Nausea Vomiting Headache Anorexia Fatigue Myalgias Arthralgias Bone pain Flush Local erythema Inflammation at the site of injection Capillary leak syndrome Granulocytopenia Thrombocytopenia Anemia Hypotension Liquid accumulation in the lung, spleen, kidneys Reversible increase in body weight Reversible increase in the serum creatinine Oliguria Malaise Asthenia Rigors Diarrhea Hepatocytotoxicity Lethargy, depression Mental confusion EEG-abnormalities

Interleukin-16 (IL-16) Interleukin-17 (IL-17) Interleukin-18 (IL-18)/ IGIF Interleukin 19 (IL-19)a Interleukin-20 (IL-20) Interleukin-21 (IL-21) Interleukin-22 (IL-22) Interleukin-23 (IL-23) Interleukin-24 (IL-24) Interleukin-27 (IL-27) Interleukin-32 (IL-32)

IL-19R IL-20Ra. & IL-20Rβ IL-21R IL-22R IL-12Rα1, IL-12Rβ2 IL-20R1,IL-20R2, IL-22R, IL-22R2 IL27RA

[59] [17] [162] [131] [205] [288] [8] [46] [128, 193] [239, 240] [188] [64, 222] [304] [187, 347] [90] [49] [166] [200, 201] [86] [24] [217, 353] [149, 336–349] [213] [347, 354, 355] [349, 350] [351, 352]

a

IL-19 is a novel homologue of human IL-10.

antineoplastic activity. Currently, IL-2, IL-12, IL-15 and IL-18 are the most potent inducers of anti-tumor activity in preclinical and clinical studies. Recently, new interleukins have been characterized, including IL-21, IL-23, IL-24 and IL-27, which exert potent immunomodulatory and anti-tumor effects in vitro and in vivo settings, indicating that they may have considerable potential as future cancer therapeutics [348]. Interleukin 1 (IL-1): IL-1 was originally described as an “endogenous pyrogen” in 1940 because of its ability to cause fever when injected into animals. Two forms of

Kapil Mehta et al. IL-1 are now recognized: IL-1a is cell-associated and is involved in antigen presentation, whereas IL-1β, the predominant form, is readily secreted by macrophages. Though the two forms have limited amino acid homology, IL-1α and IL-1β bind to the same receptor and share several biological properties. Other cell types that produce IL-1 are endothelial cells, keratinocytes, neutrophils and B lymphocytes. Constitutive expression of IL-1 occurs in cells lining the external environment, i.e., skin and mucosal surfaces [58]. The cDNAs coding for both human IL-1s were reported in 1985 [39, 83]. Recombinant IL-1s induced fever, hepatic protein synthesis, production of prostaglandin E2, cartilage breakdown, bone resorption, and elevated ACTH and augmented the T lymphocyte response to antigens and mitogens [58]. Recombinant IL-1 exhibits cytostatic activity toward human melanoma tumor cells in vitro and direct cytotoxic effects against human melanoma cell line A375 [157]. Recently, recombinant IL-1 was shown to enhance the recovery of platelets in ovarian cancer patients following carboplatin therapy, suggesting a potential role for IL-1 in attenuating thrombocytopenia associated with chemotherapy [309]. Interleukin-2 (IL-2): IL-2 is a 15.5-kDa glycoprotein produced by peripheral blood lymphocytes and is a potent growth factor for activated T lymphocytes. It acts as a cofactor in development of cytotoxic T lymphocyte activity against tumors and has been shown to participate in tumoricidal activity by inducing the growth of natural killer (NK) cells and lymphokine-activated killer (LAK) cells [242]. Several cancers show sensitivity toward recombinant IL-2, both in animal models and in the patients. LAK cells are peripheral blood lymphocytes that can be generated in vitro by incubation with high doses of IL-2. They have the ability to kill tumor cells specifically while leaving normal cells unharmed. IL-2 has been used in combination with LAK cells to achieve more potent antitumor response [242–245]. In 1985, Rosenberg and associates published the results of their first study documenting tumor regression in patients with melanoma following administration of IL-2 and LAK cells [243]. An update of the results in 180 patients was published in 1991 [242]. Antitumor responses were seen in patients with advanced melanoma, renal cell cancer, colon cancer or non-Hodgkin’s lymphoma. Like LAK, tumor-infiltrating lymphocytes (TILs), the lymphoid cells that infiltrate solid tumors, can be grown in vitro in the presence of IL-2. These cells have unique lytic activity against autologous tumors. Treatment with TILs in combination with IL-2 was shown to mediate substantial tumor regression in some patients with advanced malignant melanoma [174]. Objective responses were

61 observed that lasted for 3–14 months in 29% patients with renal cell cancer and 23% of those with melanoma. Further potential of IL-2 in cancer therapy has been demonstrated by using recombinant IL-2 in combination with other cytokines [244, 306]. For example, recombinant IL-2 in combination with IFN-α elicited a potent antitumor response in several animal tumor models [175]. The most significant antitumor activity seen with IL-2 therapy has been in malignant melanoma and renal cell carcinoma. Other tumors treated with IL-2 include glioma, bladder carcinoma, ovarian carcinoma, neuroblastoma, lung carcinoma, head and neck carcinoma, breast carcinoma, lymphoma, colon carcinoma and mesothelioma [123]. As shown in Table 4, IL-2 administration in patients is associated with a wide range of toxic effects, the most common being fluid retention, anemia, thrombocytopenia and hypotension [175]. IL-2 is the first cytokine that has been employed so widely in clinical trials. However, because of its toxic effects, its clinical use has been limited. Interleukin-3 (IL-3): Recombinant IL-3 is a 15–17kDa polypeptide that is known to stimulate mast cells, neutrophils, macrophages and megakaryocytes. No direct antitumor activity has been observed for IL-3, but this cytokine has a role in increasing platelet and neutrophil counts in patients with advanced malignancy [87]. Phase I and II clinical trials with recombinant IL-3 have been carried out in patients with advanced malignancy. A dosedependent increase in platelet counts and substantial increases in the numbers of circulating neutrophils, eosinophils, monocytes and lymphocytes were observed in these patients [87]. Hematopoietic failure caused by prolonged chemotherapy, radiotherapy or infiltration of bone marrow by tumor cells could be restored by recombinant IL-3 treatment. The side effects of rIL-3 therapy in patients include fever, bone pain and headache [87]. Thus, recombinant IL-3 is a multilineage hematopoietic cytokine with promising effects on platelet and neutrophil counts. Interleukin-4 (IL-4): IL-4 is a T cell-derived glycoprotein of 20 kDa. The gene for human IL-4 has been cloned [16]. The antitumor functions of IL-4 include increased T cell, NK cell and monocyte proliferation. IL-4 has also been shown to enhance the generation of cytotoxic T lymphocytes and to participate in induction of LAK cell activity, and to synergize with I-2 in this activity [194]. Furthermore, IL-4 can stimulate the generation of TILs in human melanoma, increase the antigen-presenting ability of mouse and human monocytes and augment the expression of tumoricidal activity in murine macrophages. It appears to inhibit the release of TNF, IL-1 and IL-6 by human monocytes [296].

62 Interleukin-4 has been shown to exert potent antitumor activity against several transplantable tumors in a murine model. Using IL-4-transfected tumor cells, the potential of transfecting lymphokine genes into tumor cells as a method of cancer therapy has been demonstrated [93]. Because of its antitumor effects in vitro and in murine models, IL-4 may be useful in inhibiting the growth of solid tumors and cell lymphomas.

Other Interleukins The family of interleukins has continued to grow and new members have been included (Table 5). IL-18 is the most recently cloned member of this family [200], which is synthesized as a 24 kDa proform that is processed into an 18 kDa mature form. The mature form of IL-18 induces IFN-gamma secretion and plays an important role in antitumor immunity [219]. IL-18transgenic mice show increased CD8+ CD44 high T cells and macrophages, while B cells are decreased in these mice [129]. Similarly, IgE, IgG1, IL-4 and IFN-γ levels are substantially increased in the sera of IL-18transgenic mice. In contrast, the IL-18 knock out mice exhibit impaired clearance of neurovirulent influenza A virus-infected neurons from the brain [190]. Another relatively newer member of the interleukin family is IL-15 that acts as a strong cofactor for Th1 T cell development and as a growth factor for T lymphocytes and TILs [112]. Like IL-2, it binds to the beta and gamma chains of the IL-2 receptor to exert its action [100]. However, specificity for IL-15 versus IL-2 resides in the unique private α-chain receptors that complete the IL-15Rαβ.g and IL-2αβγ heterotrimeric high-affinity receptor complexes and thereby allow differential responsiveness depending on the ligand and high affinity receptor expressed [323]. A recent review discusses the role of IL-15 in human diseases and its potential clinical implications as a therapeutic target [70]. Other important members of the interleukin family include IL-5, IL-6, IL-7, IL-12, IL-21 and IL-24. IL-5 is an 18-kDa product of T lymphocytes that has been cloned and shown to be a lineage-specific eosinophil growth and differentiation factor [30, 250]. Murine IL-5 induces antibody-dependent killing of tumor cells by blood eosinophils and enhances phagocytosis by eosinophils. Interleukin-6, initially described as β2-interferon, is a 19–28-kDa protein produced by a variety of cells, including mononuclear phagocytes, fibroblasts, keratinocytes and endothelial cells. The experimental data support a potential clinical role for IL-6. Its hematopoietic activity and thrombopietic activity, in particular, may make this cytokine a useful agent for inducing the

Recombinant proteins and genomics in cancer therapy recovery of bone marrow in patients with myelosuppression that usually follows aggressive chemotherapy regimens. The results of phase I clinical studies of IL-6 have recently been reported [325]. IL-7 is a 22 to 25-kDa glycoprotein that was originally characterized on the basis of its ability to promote the growth of precursor B lymphocytes [96]. Recombinant IL-7 induces the proliferation of both thymocytes and mature T cells and is known to activate macrophages for tumor cell killing. In human monocytes, IL-7 induces the expression of IL-8, IL-6, IL-1a, IL-1.b and TNF-α. IL-12, a product of B cells and mononuclear phagocytes, has multiple effects on both T cells and NK cells. It induces IFN-γ production in T and NK cells and sustains the cell-mediated immune response [304]. Interleukin-21 (IL-21) is a cytokine with structural and sequence homology to IL-2 and IL-15 that has antitumor activity alone in experimental tumor models and a tolerable safety profile in phase I trials in patients with metastatic melanoma and renal cell carcinoma [353]. Several monoclonal antibodies targeted at tumor-associated antigens also have improved antitumor activities in mice when used in combination with IL-21, suggesting that the use of IL-21 in adjuvant settings induces a strong T cell-mediated immune responses [353]. Interleukin-24 (IL-24) is a cytokine belonging to the IL-10 family of cytokines that signals through two heterodimeric receptors (IL-20R1/IL-20R2 and IL-22R1/ IL-20R2). IL-24, a recently identified cancer gene therapeutic, is melanoma differentiation associated gene-7/ IL-24 (mda-7/IL-24) that has the unique ability of inducing apoptosis in a variety of cancer cells with no toxicity to normal cells or tissues. It exerts immunomodulatory, anti-angiogenic, and radiosensitizing effects when applied as adenovirus expressing mda-7/IL-24 (Ad.mda-7) in human xenograft animal models and has been successfully used in a Phase I clinical trial in patients with advanced cancers [347, 354].

Colony-Stimulating Factors The colony-stimulating factors (CSF) are a family of glycoproteins that have the ability to induce proliferation and differentiation of progenitor hematopoietic cells and have effects on the functional status of their mature progeny. Multi-colony stimulating factor (IL-3), macrophage colony-stimulating factor (M-CSF), granulocyte colony-stimulating factor (G-CSF), granulocyte-macrophage colony-stimulating factor (GM-CSF), erythropoietin (EPO), stem cell factor (SCF), and leukemia inhibitory factor (LIF) are some of the clinically important members of this family (Table 3). All the

Kapil Mehta et al. known CSFs have been produced by recombinant DNA methods and tested in human subjects (Table 2). The potential for using hematopoietic growth factors in the treatment of disease is enormous. Their ability to control the production of blood cells has been realized, and the results of clinical trials to date suggest that the side effects of these growth factors are relatively minor [329]. Three recombinant hematopoietic growth factors, G-CSF (filgrastim), GM-CSF (Sargramostim), and EPO (epoetin alfa), are now commercially available for clinical use in the United States. Extensive clinical and preclinical data on recombinant human G-CSF and GM-CSF indicate that both these cytokines are effective in accelerating neutrophil recovery and shortening the duration of neutropenia following chemotherapy with or without bone marrow transplantation [48, 77, 185, 193, 206]. Administration of recombinant human G-CSF as an adjunct to cyclophosphamide, doxorubicin and etoposide chemotherapy for small cell lung carcinoma significantly reduced duration and severity of neutropenia and associated clinical sequelae [303]. Similarly, patients with transitional cell carcinoma of the bladder treated with methotrexate, vinblastin, doxorubicin and cisplatin experienced up to fourfold increases in neutrophil count on administration of G-CSF with few or no toxic effects [84]. GM-CSF may also exert antitumor effect by inducing tumoricidal activation of macrophages. Administration of GM-CSF has been shown to decrease the tumor burden in a murine Lewis lung carcinoma model [121]. Clinical trials of M-CSF have been performed in an attempt to ameliorate leukopenia. A phase I trial of M-CSF in patients with metastatic melanoma showed an increase in the number and function of circulating monocytes [18]. In a non-randomized, controlled study (32 patients with urinary tract malignancies) and a randomized controlled study (98 patients with gynecological malignancies), M-CSF administration reduced the period of post-chemotherapy leukopenia [192, 207]. Among the cytokines whose role can be predicted from in vitro studies, EPO is perhaps the best example. EPO is produced mainly by the kidneys and is responsible for regulating the production of erythrocytes. EPO acts on erythroid precursors in the bone marrow, spleen and fetal liver and stimulates the colony formation of the burst-forming unit-erythroid. When infused in mice, EPO markedly increases both peripheral blood erythrocytes levels and the number of erythroid progenitor cells present in bone marrow. These results led to the clinical trials with a human recombinant EPO, the findings suggested that EPO can reverse anemia in patients with end-stage renal cell disease. EPO produced dose-

63 dependent increases in hematocrit and hemoglobin levels, and in most cases eliminated the need for regular blood transfusions [67]. The major side effect reported is increased blood pressure. EPO also increases the ability of patients undergoing elective surgery to donate autologous blood [94]. Double-blind placebo-controlled studies with recombinant EPO suggested that it is an effective treatment for predialysis patients [168]. Stem cell factor (SCF) has recently been used in the clinic as a single agent following chemotherapy. SCF by itself appears to have limited efficacy and significant toxicity-mainly due to mast cell stimulation at higher doses. However, Tong et al. [300] showed that patients receiving CSF have an increase in primitive progenitor cells suggesting that SCF might be highly effective in combination with later acting hemopoietins. From these data it is clear that recombinant CSFs are effective in correcting hematopoietic disorders of various etiologies. Whether these mediators improve morbidity and mortality in patients will be decided by further clinical results. However, combinations of cytokines, for example, those with relatively restricted biological activity (EPO, G-CSF, M-CSF etc.) and those that have a broad range of action (SCF, IL-3, GM-CSF, IL-6 etc.), are likely to show more promising effects on hematopoiesis than any single cytokine alone [114].

Tumor Necrosis Factors Tumor necrosis factor (TNF) is a proinflammatory cytokine that is produced primarily by mononuclear phagocytes in response to endotoxin. In recent years, several new members belonging to the TNF superfamily of molecules has been described and the list has continued to grow (Table 6). There are two most studied forms of TNF; TNF-α is a cytotoxic factor with a molecular weight of 17-kDa, and TNF-β, also known as ‘lymphotoxin,’ has a molecular weight of 25-kDa and is released from stimulated lymphocytes [102, 203, 204, 223]. Both forms have been produced by recombinant DNA technology and appear to have antiproliferative, cytostatic and cytolytic effects against human tumor cells in vitro as well as in vivo when injected into nude mice [212]. TNF-α exerts synergistic effects with different cytokines, such as IFNs, IL-1, IL-2 etc., and can induce secretion of series of mediators, including IL-1, IL-6, prostaglandins etc. It has been implicated in both the generation and the cytotoxicity of LAK cells and cytotoxic T lymphocytes [37]. Based on these observations, a large number of phase I and II studies were initiated to investigate the antitumor properties of TNF-α. Unfortunately, in clinical settings the efficacy of TNF-α has been very limited,

64

Recombinant proteins and genomics in cancer therapy

Table 6. Members of the TNF family and their receptors Cytokine

Other names

Receptor

TNF-α LT-α3 LT-β1α2 LIGHT

TNFR1 (CD120a); TNFR2(CD120b) (TNF-β) LTβR (HVEML)

TNFR1,TNFR2

OX40L 4-1BBL

CD134L CD137L

CD27L CD30L CD40L FasL TRAIL

CD70) CD153 CD154, TRAP, gp39) Apo-1L, CD95L Apo-2L

RANK

TRANCE, OPGL

TWEAK APRIL

Apo-3L TALL-2

BAFF TALL-1, zTNF4) GITRL EDA-A1 EDA-A2 ? VEGI ? 75NTR ?

AITRL

HVEM (TR2, ATAR, LIGHTR), LtbR, DcR3 OX40 (CD134) 4-1BB, TNFRSF9, CD137, ILA CD27 CD30 CD40 Fas (Apo-1, CD95); DcR3 TRAIL-R1 (DR4, Apo-2) TRAIL-R2 (DR5, KILLER) TRAIL-R3 (DcR1, TRID) TRAIL-R4 (DcR2, TRUNDD) OPG (OCIF) RANK (TRANCE-R) OPG (OCIF) Fn14 (TWEAK-R), DR3 BCMA TACI (BlyS, THANK, TACI MCMA GITR EDAR XEDAR TAJ (TROY); TRAIN ? DR6 NGFR (p75, NTR) RELT

APRIL, A proliferation-inducing ligand; BCMA, B cell maturation antigen; BAFF, B cell activating factor; BlyS, B lymphocyte stimulator; THANK, TNF homologue that activates apoptosis, NF-kB and JNK; TACI, Transmembrane activator and CAML-interactor; TWEAK, a weak homologue of TNF; HVEM, herpes virus enetery mediator; LIGHT, homologous to lymphotoxin, shows inducible expression and competes with HSV glycoprotein D for HVEM; TRANCE, TNF-related activation-induced cytokine; RELT, receptor expressed in lymphoid tissues. For details, see references [5, 52, 109, 262, 269, 324, 339, 340].

and its use is associated with serious toxic effects [125]. Of 127 eligible patients enrolled in nine different phase II protocols between 1988 and 1990 for the treatment of diverse malignancies, including breast, colon, gastric, pancreatic, endometrial, and bladder cancers, multiple myeloma and sarcomas, only one patient responded (response rate, 0.8%), whereas 13% experienced grade four or fatal toxic effects. Despite the initial disappointing results with TNF-α as an antitumor agent, investigators have continued working on new and improved approaches

for its use. In a recent study, Lienard and co-workers [167] used an intra-arterial route to administer of high doses of TNF-α in conjunction with melphalan, hyperthermia and IFN-γ. Of the 23 patients treated (19 with melanoma and four with sarcoma), all responded, 21 with complete remission and two with partial remission. Eleven of these patients were previously unresponsive to melphalan alone and one had failed to respond to cisplatin therapy. The toxic effects observed (neutropenia, hypotension, thrombocytopenia and kidney failure) were reversible. The overall rate of survival was 70% and of disease-free survival over 12 months, 76%. These results suggested that further understanding of the mechanisms of TNF-α’s antitumor action could help improve its clinical efficacy. For example, decreasing the agent’s systemic toxicity without reducing its anticancer effects could lead to substantial therapeutic advantages. TNF-α mediates its effects by interacting with two different surface receptors, p55 and p75 [296]. Studies have suggested that TNF-α’s interaction with p75 may be responsible for its systemic toxicity [118, 296]. Thus, mutant TNF molecules that interact with p55 but not p75 could induce antitumor effects with reduced systemic toxicity, permitting higher doses of TNF-α. Indeed, such mutant human TNF molecules that specifically bind to p55 have already been described and shown to exert cytotoxic effects against transformed cells in vitro [214]. In addition, concomitant use of drugs that are able to decrease TNF-α systemic toxicity could permit use of higher, more effective doses of this cytokine in cancer therapy. Combination regimens of TNF-α with other cytokines, concomitant use of TNF toxicity inhibitors and use of mutant TNF molecules may provide better clinical outcomes. Moreover, regional therapy with TNF-α requires further exploration in view of the fact that such regimens have already produced some very promising results [167].

Soluble Cytokine Receptors Certain membrane receptors are enzymatically cleaved from the cell-surface and released into the extracellular medium in the form of soluble fragments. Soluble receptors corresponding to the ligand-binding domains of many polypeptide hormones and cytokine receptors have been described (Table 7). The function of soluble receptors is not yet known [73, 115]. However, it is likely that this process represents an important mechanism for regulation of surface expression of such receptors and may determine the effects of cytokines and growth hormones on the target cells. For example, the cell growth, differentiation and immunomodulatory effects

Kapil Mehta et al.

65

Table 7. List of soluble receptors identified for various cytokines Receptor Proteolytic cleavage: IL-1R IL-2R IL-4R (murine) IL-6R IL-6R (gp 130) TNFR IFN-α R IFN-γ R NGFR M-CSFR Hergulin R EGFR EPOR PDGFR Alternative splicing: IL-4R IL-5R (murine) IL-7R LIFR GM-CSFR G-CSFR EGFR c-erbB3

Reference [115, 267, 268, 279] [274] [74] [195, 198] [195, 198, 202] [12, 13, 88, 139] [208] [209] [60] [62] [161] [108] [21, 196] [299] [191] [178] [95] [159] [251] [79] [228] [143]

of cytokines are exerted in response to their binding to specific cell-surface receptors. The presence of soluble receptors in the biological milieu may thus promote direct binding of the ligand to the soluble receptor, neutralizing and preventing its action. The in vivo relevance of soluble cytokine receptors is well illustrated by several viruses. Vaccinia and cowpox viruses encode a protein that displays homology with soluble IL-1 receptor and is able to bind IL-1β [279]. Furthermore, proteins that bind to TNF have been identified in the open reading frame of pox viral strains [274]. Herpes and myxoma viruses encode proteins that can effectively bind IL-8 and IFN-γ ligands, respectively [7, 307]. Such soluble receptors assist virus infection by suppressing host defense mechanisms. From the studies on induction of antiviral soluble LDL receptors by IFNs, it seems that host organisms make use of a similar mechanism for the opposite role of controlling viral infection. During the release of cell-surface receptors, it is usually the extracellular domain of the receptor that is shed; thus, soluble receptors act as inhibitors of cytokines. The soluble receptors may originate via two separate mechanisms, one involving alternate splicing in which a receptor gene lacks a transmembrane domain. As an alternative, the receptors can be shed from the cell-surface as a result

of activation of specific proteolytic enzyme or enzymes. The identity of enzymes involved in proteolytic cleavage of the receptors is not known; however, it is a highly regulated process and appears to be controlled by phosphatases and kinases [4]. The treatment of cells with ligand can also lead to down modulation of the receptors and their subsequent shedding. The significance of soluble cytokine receptors as a therapeutic modality for treatment of cancer will be determined by further research and evaluation. Since soluble receptors can provide highly specific biological inhibitors for cytokines and growth factors, and because the majority of transformed cells require cytokines for their growth and survival, soluble receptors may have therapeutic potential as antagonists to cytokine action. For example, hematopoietic growth factors are known to maintain the viability of hematopoietic cells through the prevention of apoptosis [332]. Several investigators have reported that autocrine production of hematopoietic growth factors such as IL-1β [82, 104] or GM-CSF [344] supports the growth and survival of acute myeloid leukemia (AML) cells in vitro. In contrast, their soluble receptors and receptor antagonist could inhibit the growth of leukemic cells including AML [343], chronic myelocytic leukemia (CML) [68], and juvenile CML [257]. Receptor proteins for most of the cytokines have been cloned and expressed [2]. However, the information available on their therapeutic potential in cancer is very limited. Like the soluble and membrane-bound forms of cytokine receptors, the cytokine ligands also exist in these two forms. For example, the cytokines IL-1, TNF, FGF, TGFα, TGF-β and SCF have been reported to exist in both the soluble and membrane-bound forms. This process, commonly initiated by cell stimulation, may regulate the surface expression of such cytokines and play an important role in determination of cytokine activity.

Genomics and Proteomics in Cancer Therapeutic Advances in the analytical tools and recombinant DNA technology have improved our understanding of the signaling pathways encoded in cytokine, growth factors and hormones [158, 85]. In most cases, the focus of such investigation is often a single molecular target. Compilation and integration of this voluminous literature demonstrates a high level of complexity in cell’s repertoire for the detection and processing of molecular signals. Despite all this information, the relative contribution of each and more importantly, the cross-talk among different pathways that influence

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Recombinant proteins and genomics in cancer therapy

the process of differentiation, proliferation or apoptosis remains unclear. Recent advances in the techniques for quantitative and comprehensive analysis of all the mRNAs (transcriptome, ∼40,000 unique molecules [53, 317]) or all the proteins (proteome, >40,000 unique proteins) of the cell, offer a promise for defining the cellular functions in terms of causative molecular changes. In the following sections we define some of the basic concepts of these recent techniques and their early contribution in our understanding of cancer cells. These early data suggest considerable molecular heterogeneity in an apparently homogeneous group of tumors classified by conventional tools, such as immuno- and histochemistry [92, 9]. Interpretation of such results offers possible explanation for the observed differences in the outcome of a specific anticancer therapy. In addition, the spectrum of molecular targets for a therapeutic agent can also be defined by the application of global gene expression analysis [181]. Such treatment specific mRNA profiles offer the opportunity to predict diverse effects of anticancer drugs and contribute towards selection and design of tumor specific therapies. The Fig. 4 represents some essential molecular players that are involved in gene expression pathways and are recruited during changes in cell proliferation, differentiation and apoptosis initiated by extracellular signals. mRNAs and proteins are obligatory intermediates in the Cytokines Micronutrients

Growth factors

activated transcription factors

Inactive transcription factors

Translocation to nucleus

? histone acetylases histonedeacetylases

Euchromatin (active)

heterochromatin (inactive)

RNA Splicing protein

mRNAs

cDNA arrays Oligonucleotide arrays SAGE Differential display Subtraction hybridization

Proteins

Proteomic analysis (2D separation-Mass Spec)

Figure 4. Molecular players involved in gene expression pathways

signal transduction pathways [277]. It is now abundantly clear that single transcription factors such as NF-κB which is translocated to the nucleus from cytoplasm in response to binding of a cytokine to its receptor, activates a large number of genes [19, 255]. Similarly intranuclear p53 [234, 345] and MYC [41] proteins also affect the expression of large numbers of genes that are important determinants of cell proliferation and cell death. Such large-scale gene profiling studies begin to address the relative importance of individual genes in the determination of cell’s destiny.

Oligonucleotide Arrays for Quantitative Analysis of >30,000 Unique mRNAs GeneChips commercialized by Affymetrix offer a reliable tool for the evaluation of distinct mRNAs present in extracts of total RNA or mRNA by selection with oligo dT. The GeneChips are unique with respect to at least two notable features: the first that they have oligonucleotide probes prepared by a combination of photolithographic technologies and combinatorial chemistry [169]. The second unique feature of GeneChips is the distribution of the probes on the glass slide. There are 16–20 pairs of antisense oligonucleotides arrayed on a glass slide for each of ∼30,000 unique mRNAs. Each pair of oligonucleotides contains a set of perfectly matching antisense sequence of 23 nucleotides and a set of identical sequence of nucleotides with one “mismatch” base at the 13th nucleotide. Hence each mRNA is probed 16–20 times for specific binding and an equal number of times for non-specific binding. A comprehensive statistical analysis of 16–20 pairs of data for each target then evaluates the specific mRNA to be either present or absent and gives a numerical value for absolute hybridization. A major disadvantage of the technique is its inability to detect low abundance mRNA. For example, in authors’ experience, the GeneChips were unable to detect mRNAs for nitric oxide synthase genes that could be detected by RT-PCR. The application of oligonucleotide arrays to human cancers have initiated a more detailed compilation of molecular changes that are cancer specific [285–328]. Such a data-base will prove useful in diagnosis and treatment of cancers.

cDNA Arrays are Dotted Arrays of PCRAmplified Products of Cloned Genes cDNA arrays of large numbers of genes were invented and pioneered in laboratories of Patrick Brown and David Botstein [28, 256]. Unlike oligonucleotide arrays,

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cDNA arrays are constructed by robotic dotting of PCR amplified fragments of cDNA on to glass slides or nylon membranes. The cDNA arrays of human genes have been used to define disease specific gene profiles. Such analyses have contributed towards a better understanding of cancer and normal cells [9, 10]. The techniques for constructing cDNA arrays are more readily available to laboratories and tissue or cell-specific arrays can be constructed in a specialized and dedicated core facility [254]. The application of cDNA arrays to various cancers cells ex vivo [254] and in vivo [92] have resulted in a better classification of cancers and will lead to improved paradigms of anti-cancer drug development in the near future.

methods for structural determination, and to improve methods for predicting protein structure. While efforts to improve the crystallographic and NMR techniques have continued to receive a major share of intellectual effort, structural prediction studies have received new impetus from the development of new models and methods [273]. The molecular modeling serves several functions: (1) it provides the tool to visualize protein structure in three dimensions; (2) it permits protein-to-protein comparisons; (3) predicts the structure of proteins; and (4) facilitates the computer-aided drug design. Such integrated information that can define the transcriptome and the proteome will help identify novel molecular targets for therapeutic interventions of malignant growth.

Proteomic Analysis and Cancer

Antibodies and Conjugates

One major aim of scientists is to understand mutations that can cause cancer. To accomplish this aim, a thorough understanding of the workhorse of all biological systems, the proteins, is required. Currently, a major effort is being made to understand protein–protein interactions. There is an equal emphasis on understanding the structural features of proteins and the structural basis of protein–protein, protein–ligand, and protein–drug interactions. However, initially lack of techniques that enable comprehensive and quantitative labeling and separation technology for proteins, have been limiting factors these efforts [1]. The separation of cellular proteins by two dimensional, denaturing gel electophoresis combined with determination of peptide sequence to identify proteins has been used to define changes in proteins in response to oxidative stress in yeast [91]. More recent developments of analytical techniques that use novel methods of labeling and separating large numbers of proteins [1] are beginning to define the pathways of flow of molecular information from the genome to the proteome [130]. Various stable isotope labeling techniques have recently emerged to improve the efficiency and accuracy of protein quantitation by mass spectrometry. We have developed a mass-tagging strategy to incorporate stable isotope tagged amino acids into cellular proteins in a residuespecific manner during cell growth [356]. The major emphasis for new drug development in the modern era is based on thorough understanding of the relationship between the drug and its target protein, whether it is an enzyme, receptor, structural, or transport protein. Detailed information regarding the physical, chemical, biochemical, genetic, and physiological characteristics of that relationship must be well understood. Hence, a major efforts is being devoted to enhance the pace and resolution of classical crystallographic and NMR

Antibodies are highly selective proteins that can bind to a single target among millions of irrelevant sites. Because of this specificity, the antibodies have been used extensively to target drugs, prodrugs, toxins and other agents to particular sites in the body. It is this use of antibodies as targeting devices that led to the concept of “magic bullets,” a treatment that could effectively seek and selectively destroy tumor cells wherever they resided. The major problem in the therapeutic use of antibodies was their production in large quantities, but the development of ‘monoclonal antibody’ technology changed the situation dramatically [113, 186, 333]. Monoclonal antibodies (MAb) are already widely used for the diagnosis and treatment of cancer and for imaging of tumors for radiotherapy. Despite the rapid progress being made in application of MAbs as therapeutic agents, their use has been limited because of their immunogenicity problem. MAbs are usually mouse proteins; when injected into patients they are eventually recognized as foreign proteins and cleared from the circulation. To overcome this problem, researchers set out to engineer fully “humanized MAbs” that will be indistinguishable from natural proteins [32, 334]. Humanizing MAbs is a technology that uses recombinant DNA techniques to improve or change the function of these antibodies [233]. The first fully humanized MAb recognizes an antigen on the surface of human lymphocytes and is being evaluated as an immunosuppresant and for treatment of lymphoid tumors. Another potentially useful humanized MAb recognizes a growth factor receptor in large numbers on the surface of several breast tumor cells. This MAb successfully inhibited tumor cell growth in culture and is currently being evaluated in patients [322]. In the following section, we will briefly discuss the potential use of Mab-based immunotherapies

68 that have been used for the treatment of malignant diseases. Detailed aspects of this approach will be discussed somewhere else in this book.

Monoclonal Antibodies as Agonists Antibodies directed against cell-surface molecules on many types of tumor cells can act as ligands, resulting in powerful antitumor effects mediated by signal transduction [320]. For example, MAb 4D5 against erbB-2, when added to breast or ovarian carcinoma cells that overexpress erbB-2, induces a strong antiproliferative effect [164]. The erbB-2 protein product is a member of the EGF receptor family and is shown to act as a signaling receptor for a recently identified ligand, heregulin, in regulation of growth and differentiation of breast cancer and other cell types [47]. Herceptin is a humanized monoclonal antibody directed against Her-2/neu protein that is abnormally abundant in 25–30% breast cancer patients [141]. In view of the encouraging results observed in Her-2/neu positive breast cancer, Herceptin (trastuzumab) was recently approved by the FDA for treatment of metastatic breast cancer [165]. Data from pivotal trials suggested that trastuzumab is active when added to chemotherapy in patients with advanced metastatic breast cancer [271]. In particular, the combination significantly prolonged the median time to disease progression, increased overall response rate, increased the duration of response, and improved median survival time by approximately 25% compared with chemotherapy alone [271, 22]. As a single agent, trastuzumab induces durable objective response in women with HER-2 positive metastatic breast cancer and is rapidly becoming a standard of care for these patients [23]. Similarly, the ligation of CD95 (APO-1/Fas) protein with an anti-Fas MAb resulted in apoptosis (programmed cell death) of malignant cells. Using MAbs, the human Fas and APO-1 proteins were identified as cell-surface proteins of 200- and 48-kDa molecular mass, respectively, in two different laboratories. Both induced apoptosis in a variety of cell types upon binding. Subsequent isolation of cDNAs encoding the two proteins revealed that they were identical despite a difference in apparent molecular weight [133, 211]. Apoptosis triggered by the anti-CD95/Fas/APO-1 Mab has been successfully used for the treatment of mice bearing human hematopoietic tumors [302, 151]. The clinical use of anti-Fas/ APO-1 therapy for cancer treatment will be based on further studies. Besides negative signaling, Mabs have other potential uses in tumor therapy. Some MAbs can block interactions between tumor cells and neighboring cells,

Recombinant proteins and genomics in cancer therapy stroma, or matrix that are necessary for tumor growth or metastases. For example, injection of anti-CD44 MAb or its F(ab’)2 fragment 1 week after inoculation of human melanoma cells in mice with severe combined immunodeficiency (SCID) prevented metastases but not the development of primary tumor [78]. The antibody had no effect on growth of tumor cells in vitro. MAbs against growth factors or their receptors can also exert significant antitumor effects. For example, antibodies against IL-6 and IL-6 receptor were effective in the treatment of human myeloma in SCID mice [287] and produced transient responses in patients bearing IL-6dependent tumors [146]. MAbs against the IL-2 receptor have been used to treat adult T-cell leukemia with some partial or complete remissions [322]. Thus MAbs selected against tumor surface antigens to exert either potent growth-inhibitory effects or host-tumor interactions should lead to new strategies for selecting the antitumor activity of Mabs.

Monoclonal Antibodies-Conjugated Drugs The clinical progress with conjugates of Mabs and cytotoxic drugs has been rather slow. An important factor that has limited the use of this approach for treatment of cancer is the relatively low potency of standard chemotherapeutic agents. The potency of these compounds is further reduced by their conjugation with MAbs [148]. However, a recent report that such a conjugate, BR96doxorubicin (BR96-Dox), is highly effective in curing xenografted human carcinoma-bearing mice [301], has rejuvenated great interest in Mab-drug conjugates. BR96 is a chimeric monoclonal antibody that contains a framework region of human immunoglobulin and the binding region of a murine antibody. The antibody binds to an antigen that is expressed on the surface of many human carcinomas. Treatment of tumor-bearing athymic mice with BR96-Dox induced complete regressions and cures of xenografted human lung, breast, and colon carcinomas and cured 70% of mice with extensive metastases from a human lung carcinoma [301]. Clinical trials with BR96-Dox were recently initiated to determine its safety in patients. Similar results with Mab-vinblastine conjugates were reported years ago, but evaluation of this Mab-drug conjugate was discontinued because of unacceptable gastrointestinal toxic effects [14, 230]. Recently, several groups have concentrated their research on more potent immunotoxins conjugated with agents such as calicheamicins, maytansines and trichothecenes. Calicheamicin is a family of antibiotics that produce double-stranded DNA breaks; when conjugated with Mab CT-M-01, which recognizes PEM antigen and

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is located on the surface of human cancerous epithelial cells, and injected into breast carcinoma-xenografted mice, it significantly inhibited tumor growth and produced long-term tumor free survivors [124]. In a more recent study, 40 patients with relapsed or refractory CD33+ AML were treated with humanized anti-CD33 antibody linked to the calicheamicin [266]. In eight of the 40 patients, leukemia was eliminated from the blood and marrow whereas, in 3 additional patients the blood counts returned to normal. Similarly, patmaytansinoids, which are 100 to 1,000-fold more potent than doxorubicin and vinblastine, when conjugated to Mab A7, which recognizes an antigen expressed on human colon cancer cell lines, showed high antigen-specific in vitro cytotoxicity against cancer cells and low systemic toxicity in mice [34]. Similar specificity and potency have been observed in Mab-trichothecenes conjugates (protein synthesis inhibitors) has been observed in terms of their tumor cell-killing ability [189]. More recently, Mabs have been used to deliver enzyme inhibitors to tumor cells. Thus, conjugation of Geninstein (an inhibitor of Src protooncogene family protein tyrosine kinases) to MAb B43, which recognizes the B cellspecific receptor CD19, selectively bound to B-cell precursor leukemia cells, inhibited CD19-associated tyrosine kinases and triggered rapid apoptotic cell death [307]. Treatment of B-cell precursor leukemia-xenografted SCID mice with less than one tenth the maximum tolerated dose of B43-Geninstein resulted in more than 99.999% killing of human leukemia cells, which led to 100% long-term even-free survival from an otherwise

invariably fatal leukemia of these mice [307]. It remains to be seen whether antibody-drug conjugates will be effective anti-cancer agents in clinical settings as well.

Immunotoxins Immunotoxins are chimeric molecules in which antibodies or the ligand that interacts with the cell-surface molecules are coupled to toxins or their subunits (Fig. 5). The antibody or growth factor binds with high selectivity to the target cells. The toxins are derived from plants or bacteria. DNA sequences encoding the bacterial toxins; Pseudomonas exotoxin (PE) and diphtheria toxin and the plant toxins; ricin and gelonin have been cloned and expressed in E. coli, [2, 221]. The topic of immunotoxins is discussed in detail elsewhere in this book, therefore, we will concentrate only on the therapeutic potential of recombinant immunotoxins in this section. Initially, the toxins produced in bacteria were chemically linked to antibodies to make immunotoxins. In recent years, significant progress has been made in engineering recombinant immunotoxins by fusing the cell-binding ligand genes to modified toxin genes [221]. For example, a truncated form of Pseudominas exotoxin (PE40) has been produced by deleting the first 252 amino acids; this toxin has extremely low toxicity because of its inability to bind to cellular receptors [136]. However, when chemically conjugated to an antibody [76, 156] or the recombinant chimeric toxin generated by fusing the PE40 gene to DNA fragments encoding growth factors, antibody-binding sites, or other target-recognition elements, Pseudomonas

Immunotoxin (IT) Receptor

Toxin (Ricin, Pseudomonas exotoxin, gelonin etc.)

Ligand

Cell surface MAb or antigen or cytokine A chain Cytokine hormone Receptor Killing Domain

TUMOR CELL

Figure 5. Schematic representation of immunotoxin

B chain Translocation Native enhancing domain binding domain

NORMAL CELL

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Recombinant proteins and genomics in cancer therapy

exotoxin becomes highly specific and potent in killing target cells [220, 221]. The gene encoding this chimeric toxin is expressed in E. coli. Table 8 lists some of the recombinant immunotoxins that have been produced by fusing the PE40 gene to cDNAs encoding different targeting molecules. Anti-Tac(Fv)-PE40 is one such recombinant immunotoxin that was generated by fusing the truncated form of the Pseudomonas exotoxin (PE40) gene with the variable region of an antibody against the IL-2 receptor [36, 155]. This immunotoxin is highly toxic to cells from patients with adult T-cell leukemia and induced regression of IL-2 receptor-bearing carcinoma tumors in athymic mice [66, 153, 154]. TGFα-PE40 recombinant chimera toxin targets PE40 to cells with EGF [66, 258]. Although many normal cells contain EGF receptors, tumor cells often have extremely large number of receptors because of amplification and overexpression of the EGF receptor gene [238]. When administered systemically, TG&Fbdot;α-PE40 caused regression of subcutaneous epidermoid carcinoma and prostate carcinoma tumors in mice [221]. Interleukin-2-PE40 is a recombinant chimeric protein designed to deliver the toxin to cells with IL-2 receptors [172]. Normal resting lymphocytes do not express IL-2 receptors, but when they are activated with an antigen or IL-2, the receptors are induced. IL-2-PE40 has been shown to be highly toxic to activated mouse and rat T cells and had some therapeutic effect against mouse lymphoma [150]. Similarly, IL-6-PE40 chimeric toxin killed many human myeloma and hepatoma cell lines

Table 8. Recombinant toxins derived from Pseudomonas exotoxin Immunotoxin PE40 Anti-Tac (Fv)-PE40 TGF-α-PE40

IL-2-PE-40 IL-6-PE40 B3(dsFv)-PE38KDEL e23(Fv)PE40

Target

Reference

Human IL-2 receptor (leukemia) EGF receptor, epidermoid carcinomas adenocarcinomas, glioblastomas smooth muscle cells IL-2 receptor (leukemia) IL-6 receptor myelomas, hepatomas, prostate Many carcinomas erbB2 lung, breast, ovary and stomach adenocarcinomas

[36, 153–155] [66, 113, 258, 252]

[150, 172] [264, 265] [25, 26] [20]

that express IL-6 receptors at high numbers and also several other carcinomas [150, 263, 264]. The first clinical trial of a genetically engineered immunotoxin (B3LysPE38) was initiated in April 1993 in breast and colon carcinoma patients. Some responses were evident, but toxic effects appeared to be greater in human patients than seen in mice and primates [270]. In contrast to Pseudomonas exotoxin-immunotoxins, the immunotoxins composed of ricin or its A subunit and MAbs have generally been constructed using chemical cross-linking reagents [89, 173]. Recombinant ricinbased chimera molecules have been difficult to produce, because the A chain of the plant toxins must be attached to the cell recognition domain by a disulfide bond, and disulfide-linked subunits are difficult to produce in bacteria [238]. Many reviews have already described the activities and properties of immunotoxins made with ricin and other plant toxins [89, 142, 249, 308, 315, 320]. Ricin-containing immunotoxins have been used to eliminate selected populations of lymphocytes. Vitetta, Uhr and associates have produced ricin conjugates of antibodies to B cell-specific antigens and shown such conjugates to cause complete regression of B-cell lymphomas in mice [80]. Significant antitumor activity of ricin A chain immunoconjugates has been observed against solid or ascites tumors in animal models [75, 105]. Because of encouraging results in preclinical studies, several ricin-containing immunoconjugates have been developed and approved for human trials, and two kinds of human trials have been conducted. The first involves the ex vivo treatment of harvested bone marrow to eliminate contaminating tumor cells prior to re-infusion in patients undergoing autologous bone marrow transplantation. The second kind of trial involves the parenteral administration of immunotoxins [231, 308, 315, 320]. Some patients with B-cell lymphoma responded to immunotoxin therapy [89]. Currently, an anti-CD22 dgA immunotoxin is being evaluated in phase II clinical studies in lymphoma patients. The side effects observed with administration of immunotoxins are different from those of conventional chemotherapy; immunotoxins do not exert cytotoxic effects against normal rapidly dividing cells. Immunotoxins such as the bacterial toxins, Pseudomonas exotoxin and diphtheria toxin, induce hepatotoxicity, whereas the ricinbased immunotoxins cause reversible vascular leak and myalgias [320]. Several groups of researchers are currently working on second- and third-generation immunotoxins to eliminate the immunogenicity and side effects of the first generation immunotoxins. Continued refinement in design of these pharmaceuticals may eventually prove useful in the treatment of cancer.

Kapil Mehta et al.

Monoclonal Antibodies and Radioimmunotherapy The use of MAbs to deliver radioisotopes for treatment of certain cancers has yielded some encouraging results [106, 137, 138]. Some of the most promising of these results radioimmunoconjugates in bone marrow transplantation. In the treatment of leukemia, radioiodine-MAb conjugates ablate marrow safely, delivering up to fourfold more radiation to the marrow than to other normal tissues. Responses have been less frequent in solid tumors treated with radioimmunoconjugates in clinical trials [183, 184]. Objective tumor regressions, however, were seen in four patients with non-bulky disease who were treated with rhenium186-labeled Mab NR-LU-10 [134]. Because of their size and high molecular weight, diffusion of MAbs within bulky tumors can be a problem, as illustrated by the results of a clinical trial that used radiolabeled anti-CD20 and anti-CD21 MAbs to treat patients with B-cell lymphomas [236, 253]. Among the most promising approaches to overcoming this problem is the use of genetically engineered, low molecular weight F(ab’)2, Fab and singlechain Fv fragments that may diffuse better at tumor sites. Early results of clinical trials employing humanized MAbs appear encouraging. In addition to reduced immunogenicity, F(ab’)2, Fab and Fvs, with their improved ability to penetrate tumors, may prove useful carriers for radiotherapy. Newer regimens combining radioantibody-based therapy with other treatment modalities may prove even more effective.

Chimeric Proteins One interesting aspect of recombinant DNA technology is the potential for producing of new proteins with novel properties. For example, the hybrid proteins formed by fusion of two or more genes (chimera) offer several advantages in terms of their stability, affinity, efficacy and pharmacology over the individual component proteins. A chimera protein formed by fusion of the IFN-γ and LT genes was shown to have better antiproliferative activity than IFN-γ or LT alone [71]. Similarly, PIXY321, a genetically engineered hybrid of the GM-CSF and IL-3 proteins exhibits greater colony-stimulating effects in vitro than the combination of GM-CSF and IL-3 [50]. In preclinical studies, PIXY321 has been shown to accelerate both neutrophil and platelet recovery in rhesus monkeys subjected to sublethal irradiation [330]. Because of the preclinical observations, PIXY321 was tested in patients for its ability to ameliorate disease- or treatmentrelated bone marrow suppression. The clinical results were encouraging and suggested that the hybrid protein

71 elicits the biological effects of both its component cytokines [29, 311, 312]. Thus, PIXY321 became the first recombinant fusion of two hematopoietins to enter the clinic. Early clinical experience has shown great potential in the prevention and treatment of hematopoietic suppression. The other recombinant fusion proteins have been made, including chimeric toxins constructed by fusion of genes encoding human cytokines and Pseudomonas exotoxin [35, 55, 284]. For example, IL-4-PE, a chimera of human IL-4 and Pseudomonas exotoxin proteins, is highly potent against many cancer cells [55], suggesting that it might be useful in the therapy of many cancers. Generation of homologues and analogues of natural biotherapeutic proteins is another potentially important application of recombinant DNA technology. The technology involves alteration or deletion of key nucleotide sequences in the gene that will result in the modification of only a few amino acid sequences in the resultant protein, compared with the natural protein. Synthesis of novel human TNFα, IFNα and IF&Nbdot;γ homologues has already been reported [11, 214]. All three of these homologues are distinct from their parent protein. Prolonged activity of insulin has been achieved by various substitutions that increase the isoelectric point. The prolonged activity seems to occur because the novel homologues precipitate when they encounter the neutral pH of the body [180]. These examples indicate an interesting way by which protein modifications can be exploited for therapeutic potential. Furthermore, the ability afforded by newer techniques in recombinant DNA technology such as “phage display” to correlate protein structure and function in a systematic way makes it possible to design novel drugs [38, 51, 176]. Such a technique could be used to design or even select a small peptide that binds to the receptor with the same affinity as the larger protein. And then, using computer modeling to display the molecular contacts between ligand and receptor, small nonprotein molecules that make the same contacts could be designed and synthesized. The end product would be a small organic molecule that could be produced more cheaply than the recombinant protein, yet would retain the full biological activity of the protein hormone. What’s more, such molecules could be administered orally, eliminating the major disadvantage of most recombinant protein therapeutics, which must be delivered directly into the blood stream by injection.

Cancer Vaccines The issue of genetically engineered vaccines for cancer treatment will be discussed in detail in another part of

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Recombinant proteins and genomics in cancer therapy

this book. We will, therefore, focus only on the novel aspects of recombinant vaccines that may have some potential as cancer therapeutics. The function of a vaccine is to give the immune system a boost, thus helping it recognize and destroy the ‘non-self’ antigens on the surface of cancer cells. Though the idea of inciting the immune system to fight cancer has been around for a long time, recent developments in biotechnology and better understanding of the immune-system network have caused an explosion of research and development in the field of cancer vaccines. Table 9 lists some cancer vaccines that are currently undergoing clinical trial. Prior to the advent of recombinant DNA technology, two types of vaccines were used, inactivated vaccines (chemically killed derivatives of actual infectious agents) and attenuated vaccines (actual infectious organisms altered so that they do not multiply). However, these types of vaccines are potentially dangerous, as they can carry over the infectious contaminations. For example, a small number of children each year contract polio from their live polio vaccinations. Thus, one of the most promising applications of recombinant DNA technology is the production of subunit vaccines, consisting solely of the surface protein to which the immune system responds and thus eliminating the risk of infection [27]. The arrival of biotechnology in the late 1970s enabled targeting of Table 9. Cancer vaccines under clinical trials Immunogen

Target Cancer

Reference

Recombinant vaccinia encoding for CEA Gene therapy using patient’s own cells

Colorectal, lung, breast

[152]

Renal cell, carcinoma, melanoma prostate, colorectal Melanoma

[152, 287]

Melanoma Lymphoma, Cervical prostate, Prostate, Melanoma, Renal, Colorectal Melanoma, Cervical

[163] [163, 232, 346]

Recombinant poxvirus encoding for MAGE antigen Heat shock protein Naked DNA

Synthetic peptides Synthetic antigens

Anti-idiotypic antibodies Inactivated tumor cells with the cytokine IL-2 Recombinant antigens Gene transfer

[315]

[72, 224, 342] [44, 163]

Ovarian, Breast, Melanoma, Colorectal Melanonoma, Colorectal, [278, 295] gastric, ovarian Colon [163] Colorectal, lung prostate Melanoma

[63, 119, 278] [163]

specific cell-surface antigens, and monoclonal antibody technology permitted identification of tumor-associated antigens, their characterization and tissue distribution. The polymerase chain reaction (PCR) brought the technology of cloning and expressing gene products. These technologies jointly led to the development of the subunit vaccines of the 1990s. The human melanoma antigen MAGE-1 was the first tumor-specific antigen identified [315]. Poxvirus containing the MAGE-1 gene is currently being evaluated as a candidate vaccine for treatment of melanoma and breast cancers in humans [163]. Similarly, the recombinant vaccinia virus containing carcinoembryonic antigen (CEA) is being evaluated for treatment of certain cancers. CEA is expressed on the surface of virtually all colorectal cancers, 70% of lung cancers, and 50% of breast cancers. Clinical results if these phase I trials of this vaccine in late-stage cancer patients were promising [152]. A recombinant fusion of a tumor-derived idiotype and GM-CSF, yielded a strongly immunogenic protein that was capable of inducing idiotype-specific antibodies and protected the recipient animals from challenge with an otherwise lethal dose of B-cell lymphoma [295]. These results can be applied not only to B-cell lymphoma but perhaps can be generalized to other classes of tumor antigens as well. The discrete peptide fragments from certain tumorspecific oncoproteins (such as mutant p53 and the protein products of the ras and HER-2/neu genes) are rapidly progressing as potential vaccine candidates for cancer treatment [72, 342]. This strategy is based on the principle that intracellular proteins are degraded and presented back on the cell surface as small peptides in the groove of class I major histocompatibility complex (MHC) antigens. A nine amino acid peptide from the HER-2/neu oncoprotein was shown to be recognized by both breast and ovarian cytotoxic T lymphocytes, and this small peptide was able to induce a tumor-specific immune response [224]. It is now possible to isolate and custom synthesize tumor-specific immunogenic oncopeptides by using the patients’ own mutation to prepare an autologous peptide vaccine that is selectively targeted to tumor cells containing the mutant gene product [342]. The ability of human oncopeptide vaccines to generate a peptidespecific CD8+ cytotoxic T-lymphocyte response in animal models has formed the rationale for clinical trials of autologous peptide immunizations in patients with diverse epithelial malignancies (breast, lung, gastrointestinal) that are commonly accompanied by p53 and ras mutations [142]. It is likely that similar considerations will apply to other recently identified oncoproteins such as the product of the BRCA-1 gene in breast cancer.

Kapil Mehta et al. Recently, there have been several attempts to generate tumor cell vaccines engineered to secrete various cytokines [42, 43, 127, 235]. The strategy seeks to alter the local immunologic environment of the tumor cell so as to enhance either the antigen presentation of tumorspecific antigens to the immune system or the activation of tumor-specific lymphocytes. Many cytokine genes have been introduced into tumor cells with varying effects on both tumorigenicity and immunogenicity. Some of these cytokines, when produced by tumor, induce a local inflammatory response that results in elimination of the injected tumor. The local inflammatory response is, in general, dependent on leukocytes other than classical T cells. Many cytokine genes have been introduced into tumor cells, including IL-1α, IL-2, IL-4, IL-5, IL-6, IL-7, IL-12, GM-CSF, IFNα, IFNγ and TNFα [42, 215]. Preclinical data from various animal models suggest that tumor cells engineered to produce cytokines indeed provide a novel approach for tumor therapy [42, 107, 216]. Clinical trials are currently in progress to assess the therapeutic efficacy of cytokinetransduced tumors as vaccines for the treatment of established solid tumors. A remarkably straightforward and potentially useful approach in the field of cancer vaccines was recently developed. It involves the direct in vivo delivery of MHC-associated tumor antigens to provoke a tumordirected immune response. This approach for treatment of diverse malignant diseases is currently under clinical investigation (Table 9). In essence, this approach is based on the ability of some viral and human ‘naked DNA’ genes to transfect certain cells without the need for elaborate genetic engineering maneuvers, sometimes using modified DNA/liposome complexes to deliver genes by direct injection at the tumor site or by systemic administration [232, 346]. For example, injection of naked DNA or mRNA transcripts encoding human CEA in mice has been shown to elicit strong cytotoxic T-lymphocytes and antibody responses against this antigen [44, 45]. The development of this simple and direct approach for in vivo gene therapy-based immunotherapy is an extremely important avenue for continued clinical and preclinical investigations. Most tumor vaccines must be employed subsequent to the development of cancer. However, in some instances, for example, in those geographic areas in which human papilloma virus infection is highly endemic and thus rates of cervical carcinoma are high, it may be useful to vaccinate children prophylactically. In China, where endemic hepatitis virus is causally related to hepatic cancer, broad immunization to prevent hepatitis and subsequent cirrhosis and hepatic cancer is underway.

73 Ultimately, as we discussed earlier in this chapter, development of multiple strategies that could be applied in synergy are most likely to yield beneficial results in cancer treatment and control. It remains to be seen what place the immunotherapy will have in this armamentarium. However, it is obvious that availability of recombinant DNA technology has made it possible to design vaccines on a molecular basis.

Problems Unique to Recombinant Biotherapeutics The development of protein therapeutics by using recombinant DNA technology has presented many new and interesting challenges to pharmacologists and drug delivery scientists. Many of these biotherapeutics have multiple biological effects [6]; thus, an important priority in their development is the evaluation of their potency, pharmacological profile and toxic effects. One strategy to understand the potency and toxicity of anticancer agents is the use of appropriate animal models. However, many animal models that have been developed for testing conventional low molecular-weight drugs may not be useful for testing rDNA-derived therapeutic proteins. Species specificity of protein therapeutics further narrows down the choice for appropriate animal models. Certain in vitro biological properties of the interferons for example, did not translate to their efficacy in intact animals or in patients [280]. The lack of information on preclinical pharmacological behavior also limits a general analysis of the toxic effects of therapeutic proteins. For example, agents such as IFÑγ, IFN-α and IL-2 are produced in E. coli and are nonglycosylated. EPO, in contrast, is produced in Chinese hamster ovary cells and is glycosylated. Rats, dogs, hamsters and monkeys were used to study the toxicity of these agents. Comparison of results on gross morphology, histology, blood chemistry and hematology obtained from these studies demonstrated no general responses that might be attributed to the use of biotherapeutic proteins. The effects observed were primarily related to the known or anticipated biological effects of the agent and, as expected, occurred only in the species in which the agents were known to be biologically active. Considering these results, it is apparent that toxicologic findings in animals essentially reflect the pharmacological effects of biotherapeutic agents. Therefore, the use of biotherapeutic agents in species in which they are active should be most informative. However, observations of the lack of toxic effects in other species may be important in addressing some concerns about nonspecific

74 toxic effects. Cross-species activity may be seen for some if not all biological effects. For example, human IFN-α has pyrogenic activity in rabbits. Clearly, the pharmacological effects observed with materials that lack pronounced species specificity are likely to be more dependable, especially if different species have manifested the same toxicity profile. Similarly, human TNF was found to be less toxic in mice than in human subjects because one of the receptor subunits with which TNF interacts is species-specific and the other is not. In contrast, the pharmacological effects of agents like EPO are highly cell type and species specific. There have been relatively few preclinical studies of the immunogenicity of recombinant therapeutic proteins. The useful information has come from the clinical studies. The generation of antibodies to proteins administered over long periods may result in formation of soluble immune complexes. These immune complexes can induce vascular and tissue injury, particularly glomerulonephritis [281]. As an alternative, immune complexes can elicit the release of inflammatory mediators from cells. However, to date there have been no examples of antibody responses to any recombinant therapeutic protein that have been shown to clearly cause clinical pathologic effects. Another potential problem is incorporation of the wrong amino acids when a high level of expression of recombinant proteins is enforced. Such errors are generally difficult to pinpoint, since current analytical methods for amino acid composition and sequence are not really amenable to detecting variations below 10% of the major constituents. It is conceivable that such altered sequences may resemble a toxic peptide or a protein with different biological functions. Also, the altered sequences in the protein may render them immunogenic and may provoke enhanced immunogenic responses.

Delivery of Therapeutic Proteins The potential use of therapeutic proteins in medicine is severely limited because of their poor activity when administered orally. Proteins are rapidly degraded by proteolytic enzymes in the gastrointestinal tract and have been primarily administered by injection. Moreover, proteins are generally characterized by short biological half-lives in the circulatory system, so that the repeated injections are generally needed. Even after intramuscular or subcutaneous administration, their bioavailability is often low because of their small size and the widespread distribution of proteolytic enzymes. In addition, most proteins pass through biological barriers rather poorly because of low diffusion and a low partition coefficient.

Recombinant proteins and genomics in cancer therapy These considerations have led to the development of different strategies to prolong the bioavailability of therapeutic proteins. Conjugation of certain proteins to synthetic polymers can circumvent the problems of rapid clearance from the circulation, immunogenicity and instability. The general requirements of any polymer used for this purpose are that it be water-soluble, biocompatible, nonimmunogenic and devoid of biological activity. Zoladex® and Nafarelin®, the decapeptide agonists of luteinizing hormone releasing hormone (LHRH), have been formulated in slow-releasing polymer base and used effectively in clinical studies [81, 117]. Attempts have also been made to stabilize the proteins against degradation at the site of injection as well as in the circulation, but these studies are still preliminary in nature [160]. Covalent conjugation of certain proteins with watersoluble polyethylene glycol (PEG) enhances their solubility and permits the design of stable formulations suitable for clinical use. This is particularly important for recombinant proteins produced in E. coli that are usually recovered as insoluble refractile bodies, and unlike many of their native counterparts, are not glycosylated. For example, conjugation of both IL-2 and IFN-β with PEG increased their solubility, and aqueous solutions were stable for long periods of time [144]. Moreover, a recently published study revealed that PEGlated IFN-α is better tolerated and may be more effective in treating CML patients [291]. Similarly, PEGylation of TNF-α alters its pharmacokinetics and reduces its in vivo toxicity [144]. G-CSF conjugated to PEG has a four times slower clearance rate in rats than unmodified G-CSF. In addition, PEGylated G-CSF administration exerted a sustained biological effect on peripheral blood neutrophils [294]. PEGylated adenosine deaminase (ADA), an enzyme unrelated to cancer, is now approved for use as replacement therapy for severe combined immunodeficiency diseases that are due to inherited ADA deficiency. Patients who received PEG-ADA did not develop neutralizing antibodies to ADA activity [33]. The key factor with any drug delivery system is to achieve adequate concentrations of the drug at the desired sites while avoiding significant concentrations at sites that mediate toxic effects. Novel delivery systems such as liposomes may prove to be useful in achieving this. The ability of IFN-γ to stimulate the tumoricidal activity of monocytes was increased 1,000-fold by its encapsulation in liposomes [147]. Encapsulation of TNF-α in liposomes ameliorated the systemic toxicity of this cytokine in dogs [171]. Anti-HER2 immunoliposomes, consisting of long circulating liposomes linked to anti-HER2 MAb fragments proved highly efficient for intracellular delivery

Kapil Mehta et al. of the drugs and showed superior anti-tumor activity in animal models [218]. Delivery can also be modified by a combination of the biotherapeutic protein with an antibody [61]. For example, the in vivo clearance of human IFN-α in rats is threefold slower when it is combined with a specific MAb [246]. However, it remains to be seen whether such delivery systems will confer any advantages to biotherapeutic proteins in vivo in terms of local delivery, reduced toxicity or altered pharmacokinetics.

Conclusions It is clear that recombinant DNA technology has produced a revolution in the field of cancer therapeutics. The dream of biological therapy, thought to have a great potential for cancer, can now be realized. The ability to manufacture cancer drugs by using genetically engineered organisms has given rise to a novel biotechnology industry within the last decade that has earned as much as $15 billion. The revolution has been not only in the industrial sector; but also in the academic sector. It has enabled scientists to discover new molecules, redesign molecules for lower toxicity and more efficacy, and investigate the pathology of disease at the molecular level. This technology, however, has given rise to new set problems in the area of drug manufacturing and delivery. One of the major problems in the manufacturing area is ensuring that the recombinant biological product is identical or very similar to the natural counterpart. Another problem is the rapid degradation of proteins in the circulation and their short circulating half-lives, which restrict oral delivery of biotherapeutic proteins and may require continuous injection. It is now possible to design from the crystal structures of the ligand and the receptor small molecules that can mimic these large proteins and thus may help to overcome delivery problems. Some of these problems might be circumvented by directly injecting the gene for a given protein: although this approach seems attractive, it also suffers from the delivery and organ/cell-specificity problems. Treatment with antisense DNA and RNA to inhibit the expression of oncogenes in tumor cells and the new technologies based on viral vectors for the delivery of vaccines and genes may find widespread application in the near future. Many of these approaches work effectively in the test tube, and the main challenge now is to translate these laboratory techniques into commercially viable processes to produce active, effective biotherapies with acceptable toxicity.

75 Acknowledgements The research in authors’ laboratories was supported in part by a grants from Food and Drug Administration, Clayton Foundation, and Department of Defense.

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5

Current concepts in immunology ROBERT K. OLDHAM

The main function of the immune system is to protect the host from certain death due to numerous potential pathogens present in the environment. The development and maintenance of immunity is dependent on a complex and highly sophisticated defense organization functionally divided into the innate and adaptive immune systems. Innate immunity provides the first line of defense against most pathogens. Phagocytes, including neutrophils and monocytes/macrophages, and natural killer cells are the most important cell types participating in this form of immunity. In addition, several soluble factors, including the complement cascade, lysozyme, and acute-phase reactants, contribute to and reinforce the physical barriers that prevent most infectious organisms from penetrating the body. These factors also promote the activation of the inflammatory reaction that contains the injury caused by an invasive infectious agent. These cells and factors are suitable to accomplish this function because their activity does not depend on a prior encounter with the antigens in the microbial agent or tumor cells, and they lack the fine specificity of the cells and humoral factors of the adaptive immune system. Specificity and memory are two cardinal features of the adaptive immune system. The main cellular components are the T and B lymphocytes. Each clone of these cell populations has an extraordinary and unique antigen specificity via the expression of genetically programmed, antigen-specific receptors on the cell surface. The adaptive immune system has the ability to differentiate between foreign and self-molecules and in this way, most destructive reactions against the host’s own tissues are prevented. When the immune system loses its capacity to differentiate self from nonself, autoimmunity develops. The innate and adaptive systems communicate with each other directly by cell–cell interactions and through soluble mediators termed cytokines. For example, macrophages are important not only in innate immunity but also in specific immune responses, since they can present antigen and activate T and B cells. In turn, T cells regulate macrophages, B cells, and natural killer cell activity through the synthesis and release of cytokines. Some of the cytokines also behave as messengers that

R.K. Oldham and R.O. Dillman (eds.), Principles of Cancer Biotherapy, © Springer Science + Business Media B.V. 2009

mediate the communication between cells of the immune system and other organs of the body, such as the central nervous and endocrine systems. This chapter presents a summary of the structure and function of the immune system with emphasis in those areas relevant to the defense against tumors and to cancer biotherapy. The following sections will briefly describe the characteristics and functions of the major cells and mechanisms that control immune responses and the clinical methodologies for assessing the general state of immunocompetence.

Current Concepts of Immunity All the major cells of the immune system, that is, monocytes/macrophages, B and T lymphocytes, natural killer cells, polymorphonuclear cells, etc., originate in the bone marrow from pluripotent stem cells [58]. Although the exact mechanisms and mediators involved are not completely understood, it is now accepted that stem cells, under the influence of growth and differentiation factors such as erythropoietin, colony-stimulating factors, and interleukins, differentiate into two main progenitors: stem cells that have the potential to originate erythrocytes, eosinophils, platelets, granulocytes and monocytes/macrophages (GEMM-CFC); and stem cells that are the precursors for mature lymphoid cells (L-CFU) [37, 78, 109] (Fig. 1). We now know many of the factors that induce proliferation of the committed stem cells. Most of these cytokines have been purified, sequenced, and are currently produced by recombinant techniques [37, 78, 109, 134]. The availability of these recombinant cytokines has contributed significantly to defining and characterizing their biological activities (Fig. 1). Four separate colony-stimulating factors (CSFs) have been recognized. They are interleukin 3 (IL-3; multiCSF), granulocyte-macrophage colony-stimulating factor (GM-CSF), monocyte-colon-stimulating factor (M-CSF) and granulocyte-stimulating factor (G-CSF) [37, 109]. These factors, together with interleukin 1 (IL-1), interleukin 4 (IL-4), interleukin 5 (IL-5), and interleukin 6 (IL-6), are essential for the proliferation and differentiation

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Bone Marrow Pluripotent Stem Cell

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Figure 1. Origin of the cells of the immune system. All the cells of the immune system are derived from the multipotential stem cell in the bone marrow. Proliferation, maturation, and differentiation of the different cell lineages are driven by a multitude of cytokines. GEMM-CFC, granulocyte/erythroid/megakaryocyte/monocyte colony-forming cell: L-CFU, lymphocyte colony-forming unit; CFU-GM, granulocyte/monocyte colony-forming unit; B, B lymphocyte; Th/i, T helper inducer; Ts, T suppressor; Tc, T cytotoxic; Mo, macrophage; LGL, large granular lymphocyte; Pc, plasma cell; Ab, antibody; PMN, polymorphonuclear cell; EP, erythropoietin; BFU-E, burst-forming unit – erythroid; RBC, red blood cell; GM-CSF, granulocyte/monocyte colony-stimulating factor; G-CSF, granulocyte colony-stimulating factor; M-CSF, monocyte colony-stimulating factor; IL-1, interleukin 1; IL-2, interleukin 2; IL-3, interleukin 3; IL-4, interleukin 4; IL-6, interleukin 6; IFN-γ, interferon-γ

of committed stem cells, such as GEMM-CFC, GM-CFC, and L-CFU. For example, IL-3 and GM-CSF are required to induce GEMM-CFC to differentiate into granulocyte/ monocyte-colony forming cells (GM-CFC), while M-CSF, GM-CSF, and IL-3 are necessary for GM-CFC to differentiate into precursors of the monocytic lineage (Fig. 1) [37, 78, 109]. Some of these cytokines act on targeted cell lineages; for example, IL-5 regulates eosinophilic maturation and B-cell activity while erythropoietin (EP) has its predominant effects on committed erythroid cells (BFU-E) (Fig. 1). Macrophages, activated T lymphocytes, fibroblasts, and endothelial cells are the major sources of GM-CSF, G-CSF, M-CSF, IL-1, IL-3, IL-5, and IL-6 [16, 37, 44, 51, 78, 90, 109, 134].

Some of these cytokines (i.e., C-CSF, GM-CSF) are already approved for the treatment of patients with chronic severe neutropenia associated with cancer chemotherapy, AIDS, bone marrow transplantation, myelodysplasia, and aplastic anemia [27, 37]. Platelet growth activation factors have been approved and others, along with receptor agonists, are in clinical testing. Lymphocyte-precursors originating from the L-CFU migrate to the thymus where they differentiate into mature T lymphocytes. This cell population is comprised of several subpopulation, including T helper/ inducer (Th/I) lymphocytes, which modulate the activity of virtually all other cell types of the immune system (Fig. 1), T-cytotoxic (Tc) lymphocytes, which are the

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effectors of the cytotoxic responses against tumors, foreign tissues, virus-infected cells, etc. and T-suppressor or regulatory (Ts or Treg) lymphocytes, which are involved in the down-regulation of the immune response. In addition to T lymphocytes, the bone marrow lymphocyte-precursor cells also give rise to natural killer cells (NK), which are involved in the defense against tumors, and B lymphocytes (B), which after maturing in the bursa of Fabricius (in birds) or bursa equivalent (bone marrow in humans), migrate to peripheral tissues, where in response to antigens, they differentiate into antibody-producing plasma cells (Fig. 1). Mature lymphoid cells circulate in blood, from where they populate peripheral lymphoid tissues, such as the paracortical areas of the lymph nodes and the periarteriolar sheaths of the spleen, the skin, and the mucosal linings of the digestive, respiratory, and genitourinary tracts. The migration of circulating B and T lympho-

cytes into specific lymphoid tissues appears to be governed by complementary adhesion molecules present on lymphocytes and on endothelial cells of high endothelial venules (HEV) and postcapillary venules (homing receptors, specialized adhesion molecules) [115, 129]. The expression of some specialized adhesion molecules by endothelial cells is induced by cytokines produced at the inflammatory sites. For example, the intracellular adhesion molecule 1 (ICAM-1), which serves as a receptor for the leukocyte-function-associated antigen-1 (LFA-1) molecule present on leukocytes [5, 23, 110], is induced by IL-1 in endothelial cells. The rapid increase in these surface proteins facilitates the adhesion of leukocytes to the endothelium, thus accelerating the initial stages of the inflammatory reaction (Fig. 2). In addition to traffic to and from secondary lymphoid organs, a small number of lymphocytes travel through most non-lymphoid tissues of the body. This traffic Macrophage IL-6 TGF-β

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Fever Sleep Acute Phase Reactants Insulin Lipoprotein Lipase Steroid Synthesis Shock Neutrophilia GM – CSF Bone Marrow Stimulation Appetite Hypotension

Figure 2. Cytokine participation in inflammatory and immune responses. Early monouclear cell recruitment is induced by platelet-derived transforming growth factor β (TGF-β). Activated macrophages produce additional TGF-β and other cytokines, including interleukin 1 (IL-1), tumor necrosis factor α (TNF-α), and interleukin 6 (IL-6), that have local and systemic effects as well as effects on the immune response. PDGF, platelet-derived growth factor; PMN, polymorphonuclear cell; Plt, platelets

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pattern is designed to optimize the interaction of foreign antigens with the appropriate receptor specificities in T and B cells and to assure the fast development of a specific immune response. This process is also facilitated by migration of antigen presenting cells (APC) from the peripheral tissues to local lymph nodes [115]. Following cognitive interaction (i.e., involving antigen and class II histocompatibility complex molecules) between APC and T cells and T-B cell cooperation, lymphocyte proliferation and maturation take place, with the generation and subsequent recirculation of antigen specific effector and memory cells (Fig. 3). During these events, lymphoid cells secrete a number of cytokines, such as transforming growth factor β (TGF-β), IL-1, IL-6, tumor necrosis factor α (TNF-α), and platelet-derived growth factor (PDGF), that affect the inflammatory and healing

GM–CSF M–CSF TGF–β

Tr

T lymphocytes T cells, which comprise 70–80% of all circulating lymphocytes, are central to the development of normal immune responses. They play a critical role in cellular immune reactions, including delayed-type hypersensitivity (DTH), resistance against certain bacteria, viruses and tumor, and as effector cells mediating the rejection of organ transplants [2, 54]. T cells also have important regulatory function, due to their ability to produce cytokines that act on other T cells, B cells and

B

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processes by modulating the activity of endothelial cells and fibroblasts, thus linking the inflammatory and the immune response (Fig. 2) [124].

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IL–1; IL–2; CSF IFN–γ ; TNF–β Tumor cell killing

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Figure 3. Simplified scheme of the lymphokine cascade and its role in the modulation of immune response. Various cytokines with unique and overlapping biological activities are produced during the immune response. These cytokines act in concert to regulate the activation, proliferation and maturation of cells participating in the specific and nonspecific arms of the immune system. Mo, macrophage; Tr, T activated lymphocyte; Tind, T inducer; Tm, T memory; Th, T helper; B, B cell; Ts, T suppressor; Tc, T cytotoxic; Pc, plasma cell; LGL, large granular lymphocyte; IL-1, interleukin 1; IL-2, interleukin 2; IL-3, interleukin 3; IL-4, interleukin 4; IL-5, interleukin 5; IL-6, interleukin 6; CSF, colony-stimulating factor; TNF-β, tumor necrosis factor β/lymphotoxin; IFN-γ, interferon γ TGF-β, transforming growth factor β; GM-CSF, granulocyte/monocyte colony-stimulating factor; M-CSF, monocyte colony-stimulating factor; Ag, antigen; Ab, antibody; II, class II histocompatibility complex molecules

Robert K. Oldham macrophages, and by directly interacting with other lymphocytes [18, 67, 74, 112, 113, 116]. In general terms, the functions of T cells can be divided into regulatory and effector categories. The positive and negative regulatory functions are mediated by different lymphocyte subsets. The positive signals are associated with the helper/inducer subpopulation of T cells (Th/I) and the negative with the suppressor T-cell subpopulations (Ts) [2, 19, 95, 105, 125]. The effector category includes the cytotoxic (killer) T cells (Tc) reactive against virally infected cells and foreign histocompatibility antigens, and the sensitized Th(TDTH) cells, mediating delayed hypersensitivity reactions [24, 91]. T cell subpopulations can be identified by immunofluorescence or flow cytometry with the use of specific monoclonal antibodies (mAb), which react with specific surface markers. An International Nomenclature Subcommittee has examined a large number of mAb directed to leukocyte antigens and clustered them into groups of antibodies with the same reactivities (clusters of differentiation or CD), and a number was assigned to each group [46]. Helper/inducer T lymphocytes bear the CD4 marker, while cytotoxic/suppressor T cells are recognized by the presence of the CD8 marker [41, 46, 95, 96]. Other mAb, which recognize the T3 portion of the T-cell antigen receptor complex (CD3), and others that recognize the CD2, react with virtually all T cells and are widely used for the determination of total T-cell numbers [41, 46, 95, 96]. In human peripheral blood, there are twice as many CD4 as CD8, a proportion that is altered in many diseases including immunodeficiencies and cancer. More recently, the phenotypes of the two main subsets of CD-4 lymphocytes have been defined as helper-inducer (CDw29+) and suppressor-inducer (Treg) (CD25 + FOXp3 +, CD127neg) Th/I subpopulations, respectively [60, 107]. The T-cell antigen receptor (TCR) has been isolated and characterized [1, 12]. It is a disulfide-linked heterodimer composed of an α and β polypeptide chain, each containing a constant and a variable (antigen binding) region somewhat similar to the structure of immunoglobulins (Fig. 4). In a small number of T cells present in peripheral blood (0.5–10% T cells), thymus, epidermis, and gut epithelium, a different type of T-cell receptor consisting of two distinct polypeptide chains (γ and δ) has been recognized [92]. The majority of these cells do not express CD4 or CD8 on the cell surface and their functions are not completely understood, but they are believed to represent a mature functional lineage of lymphocytes that can be activated by triggering through the γ/δ receptor.

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CD4 or CD8 Th/I or

Processed Antigen T cell receptor CD3 Tc/s

Figure 4. A current model for T-cell antigen recognition. Antigen-presenting cells (APC) incorporate, process, and express the modified antigen in conjunction with MHC molecules for presentation to T cells. The interaction of T helper (Th/i) cells with APC is class II restricted; that is, it occurs when the antigen is presented to the Th/i cell together with class II molecules that interact with the T-cell receptor and CD4 molecules, respectively. Class I restriction occurs between APC expressing class I and the T-cell receptor in CD8+ (Tc/s) cells. In both cases the delivery of the transduction signal for cell activation appears mediated by the CD3 molecular complex

Both α/β and γ/δ receptors are non-covalently associated with the CD3 molecular complex, which is composed of at least four polypeptide chains, γ,δ,ε,and ζ one of which (the γ chain) has a long intracytoplasmic portion with several phosphorylation sites [12]. It is believed that the CD3 complex is involved in mediating signal transduction during the interaction of antigen with the specific binding site in the α/β receptor (Fig. 4) [12]. Antigen recognition by T cells requires that the antigen be presented to the T cells in association with the appropriate major histocompatibility complex (MHC) molecules [32] (Fig. 4) and is amplified by co-stimulatory molecules T-helper cells recognize antigen in the context of class II MHC molecules expressed by antigen-presenting cells and B cells (class II restriction), while T-suppressor and most cytotoxic T cells recognize antigen in association with class I molecules (class I restriction). Recent work has demonstrated that CD4 molecules present on T cells bind with low affinity to certain invariable regions in the class II molecules. These findings support the theory that a complex involving the TCR α/β-CD3 and CD4 or CD8 molecules is formed on the surface of the T cells during antigen recognition (Fig. 4). In this situation, the specificity is determined by the variable region of the α/β receptor, the reaction is stabilized by binding

90 of CD4 and CD8 to class II or Class I molecules, respectively, and the activation signal is transduced by the CD3 complex [64, 106].

T-helper Cells T-helper cells were first described as the T lymphocyte subpopulation that “helps” B lymphocytes mount an optimal antibody response and “induces” the generation of cytotoxic T cells. These T cells recognize processed antigen presented by macrophages or other APC in the context of Class II (DR) products (Fig. 4). The induction of lymphoid cell proliferation upon stimulation by mitogens or antigens is characterized by two distinct phases: competence and progression. The activating signals (competence signals) cause the resting T cells to move into the early G1 phase of the cell cycle. During this “competence stage,” binding of antigens to the TCR/CD3 (TCR complex) induces the generation of intracellular signals, such as increases in intracellular free calcium, membrane depolarization, generation of diacylglycerol (DG) and phosphatidyl inositol (PI) turnover, activation of protein kinase C (PKC), and changes in the levels of cAMP, cGMP, protein phosphorylation, and express of c-fos, c-myc, and other proto-oncogenes [13, 93, 94, 108, 111, 126]. These events (some of which are triggered by IL-1) lead to the expression of specific genes [including interleukin 2 and IL-2 receptor (IL-2R)] critical for the progression phase [6, 126]. During the progression stage, binding of IL-2 to its high-affinity receptor is a critical event leading to passage of competent T cells from early G1 through the other phases of the cell cycle, culminating in cell proliferation [6, 7, 29]. Other changes noted during activation are increased numbers of interleukin 1 receptors (IL-IR), de novo expression of Class II molecules, and acquisition of transferrin receptors (TR) to ensure incorporation of iron, since this element is essential for cell division [75]. The rate of T-cell proliferation is tightly regulated by the transient expression of IL-2R and the limited production of IL-2. The high-affinity IL-2R (HA-IL-2R), a heterodimer consisting of an α chain (p55) associated with a β chain (p70), is rapidly internalized in the presence of the ligand and is widely recognized as the IL-2R species that mediates the biological responsiveness to IL-2 [20, 53, 97, 98, 118, 122]. Small numbers of α-chain (MW 55 kD) molecules are normally expressed by resting CD4 + T cells. Normally, IL-2R expression lasts for about 1 week, and IL-2 production for 2 or 3 days.

Current concepts in immunology Antigen-activated CD4 T-cells release a number of cytokines including IL-2, gamma-interferon (IFN-γ), colony-stimulating factors (CSFs), B-cell growth factors (IL-4, IL-5, IL-6), etc. [38, 40, 49, 73, 79, 87, 88, 117, 132] (Fig. 3). These cytokines, in turn, induce activation, proliferation and differentiation of other antigenspecific T and B cells resulting in a specific immune response and the production of memory T cells (Fig. 3). There is some evidence that lymphokine release from TH cells can lead to tumor regression (see Chapter 8). Although human counterparts are not fully characterized, there are two well-defined subpopulations of murine Th/I lymphocytes, termed TH1 and TH2 [69]. These subpopulations are characterized by the secretion of different sets of cytokines, leading to different functional properties [69]. Although some cytokines such as GM-CSF, TNF-α, and IL-3 are produced by both cell types, TH1 but not TH2 clones produce IL-2, γ-interferon, and lymphotoxin (TNF-β) [69]. In contrast, TH2 but not TH1 cells synthesize IL-4, IL-5 and IL-6. TH2 cells induce growth and immunoglobulin (Ig) secretion of B cells in response to specific antigens and polyclonal activators. These functions require not only IL-4 and IL-5 synthesis but also TH2-B cell-cell interactions. In addition, IL-4 is essential for IgE production, and IL-5 appears to play a role in B-cell hyperactivation observed in mice prone to develop a severe lupus-like autoimmune syndrome. TH1 cells appear to be involved in proliferation (but no Ig synthesis) of B cells, induction of T-cell activity, and generation of cells participating in the late phase of delayed hypersensitivity reactions. Immune responses characterized by predominant activation of TH1 cells may result in strong induction of macrophage-mediated cytotoxic reactions induced by IFN-α and TNF-β and increased expression of Fc receptors for IgG2a in macrophages. Thus, these responses would result in effective killing of target cells with intracellular viral or parasite infections and strong DTH reactions. In contrast, activation of TH2 cells lelads to immune responses characterized by high levels of antibody production. Normal immune responses probably involve the participation of both cell types [69].

T-suppressor Cells T-suppressor (regulatory) cells suppress (down-regulate) T cell activity, antibody production by B cells, DTH, contact sensitivity, cytolytic T-cell function, proliferation of T cells, and immune responses against tumors [2, 19, 105]. The Ts cells are activated during normal

Robert K. Oldham responses to a variety of antigens, thereby providing a safety mechanism that continuously controls the magnitude of the immune response. Although T-suppressor cells are antigen-specific, they are also able to bind antigen in the absence of accessory cells or specific products of the MHC. T-suppressor cells appear to be selectively activated when the antigen is presented in certain routes, that is, intravenously or orally, or when administered in very low doses (low zone tolerance). T-cell induced suppression might be mediated directly by Ts cell or by antigenspecific and non-antigen-specific soluble factors released by them (TSF). Ts binding consists of an antigen-binding portion and an I-J molecule (28 kD) that binds to the acceptor cell through the antigen molecule and an I-J binding site [68]. Regulatory T cells inhibit tumor immunity in some experimental systems [105], and recent clinical trials [20] utilizing antibodies to Treg cells have demonstrated that these biological drugs have clear therapeutic activity (see Chapter 6).

T-cytotoxic Cells T-cytotoxic cells were originally described as the effector cells of specific cell-mediated cytotoxicity against allografts, virus-infected cells, bacteria, tumor cells, etc. The Tc lymphocytes also interact with the antigen (most commonly a foreign cell, tumor cells, or virus-infected cells) through the T-cell receptor [54, 71]. The interaction of specific cytotoxic T cells with the target structure results in lysis of the latter. “Killing” of a target cell, including tumor cells, consists of a number of mechanisms that can be divided in three phases [35, 36, 131]. Initially, binding between target and effector cells must take place. The majority of cytotoxic T cells are CD8+ and therefore recognize the antigen in the context of MHC 1 molecules (class I restriction [32]). In addition, they can also recognize foreign class I antigens alone, indicating that they can be effective in the destruction of allogeneic transplanted tissues. A small percentage (10%) of cytotoxic T cells bearing the CD4+ phenotype recognize antigens in association with class II molecules and might play a role in lysis of virus-infected cells [36]. The second phase (“programming for lysis”) involves the reorganization of cytoplasmic organelles, including polarization of the microtubule organizing center and tubulin and actin. This leads to an increased area of contact between the target and effector cells, leading to an increase in the efficiency of the cytolytic process. This is followed by reorientation of the cytoplasmic granules toward the binding region, fusion to the membrane, and release of lytic molecules (perforins) contained in those

91 granules. The presence of calcium is the limiting factor in this phase, since polymerization of the perforin molecules on the membrane of the target cell with channel formation does not occur in the presence of calcium chelators [42, 66, 71]. The granules also contain other factors known to mediate cytotoxic and cytostatic effects on tumor cells, such as esterases and proteoglycans [89]. The third phase includes the delivery of the lethal hit and death of the target cell. Following interaction with the cytotoxic T cell, disturbances in the ion concentrations and DNA fragmentation and fluid extrusion occur, culminating in target-cell disintegration. Interestingly, cytolytic cells are resistant to the cytolytic mechanisms that they generate, and in this way each effector Tc may kill more than one target cell. Studies of Tc cells infiltrating human tumors has helped define therapeutically active T cells leading to tumor regression. These cells have proven exceedingly useful in defining relevant human tumor associated antigens for vaccine formulation.

B lymphocytes B cells are responsible for humoral immunity, and, like T cells, are present in peripheral blood where they represent about 10–20% of the circulating lymphocyte pool. After activation, B cells mature into specific antibody-secreting cells or plasma cells [48, 128, 133]. Mature B cells express surface immunoglobulins (Ig) with identical specificity to the antibodies (Ab) they secrete [128]. The majority of peripheral blood B cells express both IgM and IgD, while most B lymphocytes present in body tissues express IgG, IgA, and IgE. Most B cells also express Class II molecules in the cell membrane. These molecules participate during the physical cell–cell interaction that takes place during T-B cell cooperation. In addition, receptors for the Fc portion of IgG, the third component of complement (C3b), IL-2 and a large number of other markers (CD19, CD20, CD21, CD22, etc.) have been found on the surface of mature B lymphocytes [48, 128, 133]. The process of activation and maturation of B lymphocytes into plasma cells involves the interaction of antigens with the specific immunoglobulins on the surface of B lymphocytes, which triggers cell activation and proliferation. The cooperation between B cells and Th/I, macrophages, and other accessory cells, a process requiring identity of Class II products of the MHC among these cells, is necessary to induce optimal B lymphocyte responses. However, binding of antigen to B cells is necessary but not sufficient to initiate antibody

92 production. Nonspecific maturation and differentiation factors (i.e., cytokines) mainly produced by Th/I cells are also involved in the activation and progression of mature B cells into antibody-forming cells [49, 128]. Among these factors are IL-1 (produced by macrophages and other accessory cells), IL-2, IL-4, IL-5, IL-6, IFN-γ and other factors secreted by activated T lymphocytes [17, 22, 40, 44, 49, 52, 78, 79, 88, 90, 128]. Several of these cytokines, including IL-1 and IL-4 are also produced by B cells [22, 49]. Most of the circulating B lymphocytes are in the resting state (G0 phase of the cell cycle), but they become activated after interaction with the specific antigen or antigen-presenting cells in the presence of IL-4 and IL-1, progressing to the G1 phase of the cell cycle. Activated B cells undergo cell division in the presence of T cells and secreted cytokines. Differentiation of proliferating B cells into plasma cells is mediated by IFN-γ, IL-4, IL-5 and IL-6 [40, 78, 79]. Alternatively, proliferating cells may return to the resting state and remain as memory B lymphocytes (Fig. 3). During the maturation process, they not only increase their rate of Ig synthesis and actively secrete Ig, but they also switch the class of heavy chains that carry the variable region of Ig involved in antigen recognition [49, 128]. It has been demonstrated that a single clone of proliferating B cells may switch at any division. Not all the proliferating clones mature into secreting plasma cells. Some return to the resting state and remain as long-lived memory cells [128].

Monocytes and Macrophages Monocytes are large cells (15–30 μm in diameter) that comprise about 10–25% of peripheral blood mononuclear cells (PBMC). They originate in the bone marrow from monoblasts, circulate in peripheral blood as monocytes, and then enter various tissues where they are termed resident tissue macrophages (Fig. 1). The large degree of heterogeneity that exists within the macrophage population is believed to represent different stages of the maturational process and reflect environmental conditions at the tissue level, rather than distinct macrophage subpopulations [57]. Monocytes/macrophages can be identified by a number of methods, including morphology, ingestion of particles (such as latex), histochemical staining of cytoplasmic enzymes (such as nonspecific esterase), and by flow cytometry with a number of mAb that recognize markers present on their membrane (i.e., CD40, CD54, CD80 and 86, etc.) [46]. Monocytes/macrophages play a critical role in the defense against bacterial and other infections by ingest-

Current concepts in immunology ing and killing the attacking microorganisms [57, 123]. They have also been shown to be very effective in destroying neoplastic cells and removing dead or injured cells (scavenger function). In addition, monocyte/macrophages are critical for the development of normal immune responses since they process and present antigen (dendritic cells) to T lymphocytes and secrete cytokines that play a major role in the initiation of specific immune responses, such as IL-1 and IL-6 [10, 11, 17, 22, 44, 51, 57, 90, 104, 119] (Fig. 3). Monocytes/macrophages have been shown to secrete more than a hundred different molecules that mediate their functions. These products include (a) enzymes with bactericidal capacities, such as lysozyme and lysosomal hydrolases, neutral proteases (e.g., collagenase and plasminogen activator); (b) arachidonic acid metabolites (e.g., prostacyclin, prostaglandin E2, and leukotrienes), which have profound effects in the regulation of the immune response; (c) reactive oxygen metabolites (e.g., superoxide, O2 radical, and H2O2), which are important mediators in macrophage-mediated cytotoxicity; (d) complement components; (e) coagulation factors; and (f) cytokines, which in turn exert a multiplicity of regulatory actions including playing a critical role in antigen presentation to T cells [10, 11, 17, 22, 44, 51, 57, 90, 104, 119, 123] (Fig. 3). Antigen-presenting cells, which include dendritic cells, Langerhans cells, veiled cells, interdigitating cells, and others in addition to macrophages, are characterized by their ability to process and present antigen to T cells in conjunction with MHC class molecules, as well as cytokine production, resulting in T-cell activation. Macrophages incorporate antigens nonspecifically by phagocytosis or by binding of immune complexes to the Fc receptors. In contrast, activated B lymphocytes bind antigen via the specific antigen receptor, and dendritic cells are likely to process antigen directly in the cell membranes. These short peptides (8–24 amino acids) are then linked to the antigen cleft in the class II molecules and returned to the cell membrane for interaction with the Th/s cells [32] (Fig. 4).

Natural Killer Cells Natural killer cells were first discovered by Oldham and co-workers [80, 81]. Later studies defined their ability to bind and lyse sensitive tumor and virus-infected normal cells without the need of previous sensitization [31, 59, 84, 121]. These cells, which constitute approximately 15% of peripheral blood lymphocytes, are a relatively homogeneous cell type identified as large granular lymphocytes

Robert K. Oldham (LGL). LGL are nonphagocytic, express receptors for the Fc portion of IgG (FcR-positive), and have a high cytoplasm to nucleus ratio, indented nucleus, and a few discrete azurophilic granules in the cytoplasm [84, 121]. Several monoclonal antibodies have helped define the surface markers and the phenotype of natural killer cells. Some human NK cells express the following T-cell markers: CD2, CD8; and after activation they express T10 (a marker present in thymocytes and activated T cells) [46, 59, 84, 121]. NK cell function is regulated by stimulatory and inhibitory mechanisms. The generation and function of NK cells are regulated mainly by IFN-α, IFN-γ, IL-2 and IL-4 [59]. IL-2 and IFNs increase the lytic activity of mature NK cells, promote the recruitment and activation of nonlytic cells, and induce proliferation of precursors and mature cells either in vivo or in vitro [121]. In addition to their nonspecific cytotoxic activity against tumor cells, NK cells may exert a regulatory role in specific immune responses mediated by T and B cells because of their ability to produce a variety of cytokines including IFN-α and γ, IL-2, IL-1, CSF, and TNF-α [59, 84, 121]. Natural killer cells play an important role in the resistance to growth and metastasis of malignant tumors [81]. Results obtained using several in vivo experimental models suggest that NK cells are of paramount importance during the early stages of tumor development. For example, NK-sensitive clones of tumor cell lines take longer to develop into palpable tumors when injected in the footpads of syngeneic hosts than NK-insensitive clones with similar doubling times [4, 39, 47]. Furthermore, selective depletion of natural killer cells in experimental animals has been correlated with increased frequency of spontaneous tumor metastasis.

Lymphokine-activated Killer Cells The lymphokine-activated killer phenomenon (LAK) was originally defined as the ability of PBMC incubated for several days in vitro in the presence of IL-2 to lyse freshly isolated tumor cells and NK-resistant targets, such as the HL-60 cell line [33, 34, 76, 100, 102, 130]. The LAK phenomenon, which is not MHC restricted [85], can be mediated by cells expressing markers present in both T and NK cell populations. For example, the presence of cell populations with LAK activity expressing CD16 (Leull, an NK marker) and/or CD56 (Leu19, a marker present in both Tc and NK cells) has been reported in short-term cultures. Most of the LAK activity

93 in long-term cultures stimulated with IL-2 and anti-CD3 was observed in the CD3+ CD16−; CD3− CD16+; CD3+ CD4− CD8−; CD16− and CD3− CD56+ cell populations. On the contrary, the CD3+ CD4+ or CD3+ CD8+ populations present in these cultures exhibited a significantly lower level of LAK activity [77]. Interleukin-2 mediated induction of LAK cells can be enhanced by the addition of IL-1α or IL-1β, probably by rendering LAK precursors more susceptible to the activity of IL-2 [14, 21]. Interestingly, recent evidence indicates that the generation of LAK cells is dependent upon the expression of the p70/75 (intermediate affinity) IL-2 binding protein in the cell membrane. The expression of p70 occurs in the absence of the p55 (low affinity, Tac) IL-2 binding protein, which is critical for the expression of high-affinity IL-2R in activated T lymphocytes [86]. In addition to their remarkable tumoricidal activity, LAK cells are able to secrete IL-1α, IL-1β, IFN-γ, TNF-α, and TNF-β (lymphotoxin) [56]. Experiments in murine models have clearly established the in vivo antitumor activity of the cells mediating LAK activity (i.e., LAK cells) when administered in conjunction with high doses of IL-2 [55, 56, 70, 103]. Based on these observations, a number of clinical trials in advanced cancer patients were done and these have demonstrated clear, but limited, antitumor activity [16, 101, 127].

Clinical Assessment of Immune Competence In Vivo Delayed Type Hypersensitivity (DTH) DTH is a test of cell-mediated immunity based on the response against a test antigen after it is injected intradermally, or applied topically to the skin (Table 1). Reddening and induration of the test site occur in 8–12 h, reaches a peak at 48–72 h, and thereafter slowly subsides. The DTH lesion is characterized by the accumulation of mononuclear cells in the subcutaneous and deep and superficial dermis [8]. It should be stressed that DTH reactions are complex immunological phenomena requiring the participation of effector T lymphocytes as well as monocytes/macrophages as accessory cells. Thus, a deficit of T cells or monocyte/macrophages, or the presence of certain serum inhibitory factors that impair T cell or monocyte/macrophage activity, or active suppressor cells, leads to impaired DTH reactivity. Antigens used in DTH testing can be divided into two classes: recall antigens and neoantigens (an antigen to

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Current concepts in immunology

Table 1. Selected immunologic tests Parameter T Cells Total and subpopulations Responses to antigens Cytokine production T-receptor gene rearrangement Cytotoxicity B Cells Total number Surface Ig Ig gene rearrangements Serum immunoglobulins Serum Ig classes Reticuloendothelial system: Monocytes, macrophages Cytokine production Phagocytosis Chemotaxis Tumor cell killing Activation

Test Flow cytometry Cell proliferation elicited by PHA, Con A, MLR Delayed-type hypersensitivity Bioassays/RIA/ELISA Southern blot analysis Release of radiolabeled compounds from target cells Flow cytometry Flow cytometry Southern blot analysis Serum electrophoresis Nephelometry, RID

Bioassays, RIA, ELISA Cytotoxicity in vitro Production of oxygen radicals

which the subject has never been previously exposed). One of the most commonly used neoantigens is 2,4-dinitrochlorobenzene (DNCB), which has been used extensively in cancer patients. Among the recall antigens, tuberculin (PPD), mumps, tricophytin, and candida have been the most commonly used [8]. In general, several recall antigens are studied simultaneously to ensure that a patient will have been exposed to at least one or more of them. The interpretation of skin tests can vary widely between studies, since antigen concentration, reader variability, patient’s prior exposure to the antigen, boosting effects of repeated antigen administration, time course of the reaction, and definition of a positive reaction are all variables that can influence the final assessment of a positive or negative response. Of the available agents, only DNCB has been a consistently useful skin test agent. However, DNCB is an awkward reagent to employ, as repeated testing will clearly yield anamnestic responses. Thus, only the original test on an individual can provide clear information on the responsiveness to a neoantigen.

Humoral Immunity The testing of the levels of total and different classes of Ig, as well as the primary or secondary antibody responses to a variety of antigens in the sera of cancer

patients, has been used as an indication of the existence of alterations of immunoregulatory processes or of defects in the production of Ig. Quantitation of the levels of Ig is usually measured by the single radial immunodiffusion method, ELISA, or by nephelometry [62, 63]. Among the antigens used to elicit primary and secondary antibody responses are brucella endotoxin, salmonella extract, hemocyanin, etc. Antigens have been divided into T-cell dependent or T-cell-independent depending upon whether or not Th/I cells are required for maximal antibody production by B cells.

Reticuloendothelial System The in vivo phagocytic cell function can be assessed by measuring the rate of clearance from the bloodstream after intravenous injection of a variety of materials including colloidal gold, bacterial proteases, lipid emulsions, or aggregated human albumin labeled with radioactive iodine [72, 114]. Another technique that has been used to study reticuloendothelial function is the Rebuck skin window. In this procedure, a microabrasion of the skin surface is made, followed by application of a cover slip to the raw area, and assessment of the accumulation of macrophages onto the coverslip [45].

In Vitro Immune Cell Quantitation The accuracy in the quantitation of the levels of the different cells and cell subsets involved in the immune response has improved dramatically with the advent of the monoclonal antibody technology. It is possible to accurately estimate the numbers of monocytes/macrophages, Th/I, Tc, and Ts (regulatory) lymphocytes, LGL, B lymphocytes, granulocytes, etc. with the use of flow cytometry using mAb that recognize specific markers on the surfaces of individual cell types [46, 99].

Lymphoproliferative Responses This has been one of the most widely applied tests for the determination of lymphocyte function. It is based on the property of lymphocytes to undergo blast transformation and proliferate in response to mitogenic or antigenic stimulation [61]. The most commonly used mitogens include phytohemagglutinin (PHA) and concanavalin A (Con A), which primarily stimulate T cells, and pokeweed mitogen (PWM), which stimulates both T and B cells. Whereas mitogens nonspecifically activate broad subpopulations of

Robert K. Oldham cells, antigens activate specifically sensitized antigenreactive clones. The assay can be performed with whole blood but most laboratories usually first isolate PBMC (from whole blood, lymph nodes, or tumor specimens) by density-gradient fractionation on Ficoll-Hypaque followed by incubation with the appropriate mitogen at various concentrations. Seventy-two hours later cultures are pulsed with radiolabeled [3H]thymidine, which is incorporated into the cellular DNA. Cells are then harvested and the radioactivity quantitated in a liquid scintillation counter and expressed as counts per minute (cpm). A similar technique has been extensively employed to measure proliferative responses to antigenic stimulation. In these studies, mitogen is replaced by the specific antigen under study and longer incubation periods are usually required [61]. Antigen responses are usually lower in magnitude that those observed with mitogens, since they represent the activation of specific T-cell clones, rather than most lymphocytes as is the case with mitogens. Another proliferative response assay is the mixed leukocyte reaction (MLR). This test is based in the ability of T cells to proliferate in response to alloantigenic stimulation (that is cells expressing different MHC antigens). This is the in vitro correlate of in vivo graft rejection, and is usually performed by incubating PBMC obtained from the patient (responder cells) with irradiated PBMC obtained form one or more histoincompatible individuals (stimulator cells) for 6 days. Response is measured by [3H]thymidine incorporation as described above [61].

Cytotoxicity Cytotoxic reactions mediated by antigen-specific T cells, NK cells, antibody-dependent killer cells, lymphokine-activated killer cells (LAK), and activated macrophages are measured most commonly in microcytotoxicity assays [9, 30]. In general, target cells are labeled with a radioactive element able to bind to some intracytoplasmic structure, which is released to the media when the cell dies. Fixed numbers of labeled target cells are incubated in microtiter plates with different numbers of effector cells. The assays last for from 4 to 48 h, after which the supernatants are collected and the radioactivity counted. The extent of radioactivity present in the supernatants is in direct relationship with the amount of killing. The results are expressed as percent cytotoxicity [9, 31].

95 been developed for their quantitation in the clinical setting [28]. For example, the measurement of IL-2 is based on (a) the fact that T lymphocytes produce IL-2 in response to mitogenic and antigenic stimulation and (b) the ability of IL-2 to induce lymphocyte proliferation and maintain in vitro T cell lines (called IL-2 dependent cell lines). The first step is the generation of cell culture supernatants containing IL-2 by incubating PBMC with mitogens (usually PHA or Con A) for 24–48 h. The IL-2 content in these supernatants is then determined by their ability to support the in vitro growth of an IL-2 dependent T-cell line, as assessed by [3H]thymidine incorporation after 24–48 h of culture [30]. Currently, the concentrations of a variety of cytokines, including IL-1, IL-2, IL-4, IL-6, GM-CSF, TNF-α, IFN-γ, etc., are measured using commercially available immunoassays [radioimmunoassay (RIA) and/or ELISA], which employ specific monoclonal antibodies (see Chapter 8).

Immunoglobulin Production Immunoglobulin production can be assessed in vitro by exposing a suitable effector cell population (e.g., PBMC) to either a polyclonal B-cell mitogen (e.g., PWM) or specific antigen and following a period of incubation, detecting the immunoglobulin produced. Secreted Ig can be detected either in the culture supernatants by using ELISA or radial immunodiffusion (RID) techniques.

Phagocytic Cell Function Both mononuclear (e.g., monocytes/macrophages) and polymorphonuclear (PMN; e.g., granulocytes) leukocytes exhibit phagocytic activity. Well-established techniques exist for the assessment of monocyte phagocytosis, hemotaxis (motility), and response to lymphokines (e.g., migration inhibition factors, MIF) [25, 26, 65, 70, 108]. Established techniques also exist for the assessment of monocyte/macrophage cytotoxicity [50]. Various tests are also available to measure PMN functions, including tests of phagocytic cell activity, bactericidal capacity, and the ability to take up and reduce nitroblue tetrazolium dye (NBT) [3].

Immunoregulatory Cell Functions

Lymphokine Production

These assays are technically difficult to perform and are not usually part of the routine assessment of immune competence. Three broad classes of immunoregulatory cell assays have been utilized:

As the roles of some of the soluble mediators in the immune response have become clearer, assays have

1. Coculture assays. In these assays effector cells (e.g., B cells, T cells) are exposed to a polyclonal activator

96 (e.g., PWM, MLR) in the absence or presence of test cells. The test-cell population might induce either enhancement (e.g., increases in antibody production or enhanced MLR responses) or reduction (suppression) of the response of the effector cells [125]. 2. Mitogen-induced suppressor T-cell activity. In this system suppressor cells are generated from resting T cells by exposing them to a polyclonal T-cell lectin such as Con A. Con A induced suppressor cells are then added in coculture to an effector-cell assay as described above. 3. Adherent suppressor cells. The presence of suppressor monocytes can be assessed by either a positive or negative effect. In the former situation, removal of adherent cells (e.g., monocytes) leads to augmentation of effector cell function (e.g., lymphoproliferative responses to mitogens), while in the latter case, readdition of adherent cells leads to suppression of the response [120].

Quality Control of in vitro Assays In practice, it has been difficult to standardize lymphoproliferative or cytolytic assays to insure the universal validity and reproducibility of results. A number of conditions affect the comparability of in vitro assays as performed in different laboratories such as assay incubation time, presence or absence of physiological buffers and/ or serum supplementation, choice of methodology to prepare the responder cell population (i.e., purified lymphocytes or unfractionated mononuclear cells), and the purity and/or concentrations of mitogen/antigen, or radioactive label. In addition, various in vivo confounding variables, such as the influence of concurrently administered drugs, or seasonal and/or diurnal effects, provide further sources of assay variability. A number of procedures have been employed in an attempt to minimize interassay variability such as the use of cryopreserved reference lymphocyte preparations [43, 82] or indices based on results from a panel of reference lymphocytes [15]. Nevertheless, because of the inherent variability of in vitro assays, only limited successes have been achieved in clinical trials to date. Indeed, neither appropriate guidelines for interpreting the results of clinical trials employing immunorestorative agents nor identified statistically significant end points upon which to select appropriate sample sizes for such clinical trials currently exist [83]. Acknowledgment Dr. Susana A. Serrate-Sztein (National Institutes of Health, Bethesda, Maryland) and Dr. Marcelo B. Sztein (University of Maryland School of Medicine,

Current concepts in immunology Baltimore, Maryland) contributed much of this chapter in the second edition, which was revised by the current author in the third, fourth, and fifth editions. I would especially like to acknowledge the assistance of Dr. Richard S. Schulof, who co-authored this chapter in the second edition, but died in an accident during the preparation of the third edition.

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6

Therapeutic approaches to cancer-associated immune suppression ROBERT K. OLDHAM

It is now well established that many cancer patients exhibit in vivo and in vitro evidence of immune suppression, which often correlates with tumor-cell burden, stage of disease, and prognosis. Except in transplantation associated cancers, cancer-associated immune suppression appears to be a direct result of the presence of disease, or follows treatment for it, rather than being an antecedent or predisposing condition. However, the precise role that nonspecific and/or specific antitumor immunity plays in the control of human cancer remains controversial. Indeed, there is some evidence that suggests that the development of certain immune responses may lead to augmented tumor cell growth rather than tumor regression [178, 287, 406, 407, 582]. The clinical relevance of the relative state of general immunocompetence in determining whether or not a patient can be cured of cancer also remains controversial. A case in point is the dissociation between immunodeficiency and curability of patients with Hodgkin’s disease. Despite the well-recognized immune suppression associated with this malignancy, and the immunosuppressive therapies used to treat patients (e.g., lymphoid irradiation and steroid-containing combination chemotherapy), it is one of the most curable of all cancers. Such a discrepancy suggests that unique biological properties of malignant cells, rather than the general immune competence of the patient, are the more critical factors in determining the curability of cancer. Even though the precise relationship between the general state of immune competence and cancer curability has not been established, investigators have administered a variety of agents to cancer patients including biologicals, vitamins, hormones, and drugs, hoping that the reversal or prevention of general immune suppression might translate into prolonged disease-free remissions and improved patient survival. This chapter will review the multifactorial basis of cancer-associated immune suppression and the therapeutic strategies that have been utilized. The sections on immune suppression will focus exclusively on the general assessment of immunity, and not specific antitumor immunity. The sections on therapy of immune suppression will be limited to those biological response modifiers (BRMs),

R.K. Oldham and R.O. Dillman (eds.), Principles of Cancer Biotherapy, © Springer Science + Business Media B.V. 2009

both chemical and biological, that were administered either to restore depressed immunity to normal, or to prevent the deterioration of immune competence due to surgery, radiation therapy, or chemotherapy. BRMs that have been employed as adjuvants along with tumor cell or tumor antigen vaccines to boost specific anti-tumor immune responses, or whose primary mechanisms of action are by activating effector cells directly, such as interferons and/or interferon inducers, muramyl dipeptide and cogeners, or interleukin-2 and other interleukins (e.g., tumor necrosis factor), will not be covered, nor will more “traditional” whole organisms from the older literature [e.d., Bacillus Calmette-Guerin (BCG), Corynebacterium parvum, or mixed bacterial vaccine].

Immunosuppression and Cancer It is clear that preexisting immunodeficiency plays a permissive role in the development of certain cancers, such as malignant lymphoma or Kaposi’s sarcoma [393, 448]. Patients with primary (e.g., Wiscott-Aldrich syndrome, at ataxia-telangiectasia) or secondary (e.g., acquired immune deficiency syndrome, AIDS) immunodeficiency syndromes in which defects in cell-mediated immunity predominate and patients receiving immunosuppressive drugs following organ transplantation all exhibit an increased incidence of Burkitt’s and non-Burkitt’s lymphoma, Kaposi’s sarcoma, and a variety of other tumors not otherwise commonly seen. In several instances, following the cessation of immunosuppressive therapies, cancer regressions have been noted, suggesting that when immunocompetence is restored, control of tumor growth may occur. Patients with primary (e.g., Bruton’s-type agammaglobulinemia) and secondary (e.g., chronic lymphocytic leukemia) immunodeficiency syndromes in which defects in humoral immunity predominate also exhibit an increased incidence of malignancies including skin cancer, primary brain neoplasms, sarcomas, carcinomas, and leukemias [167, 240, 394, 436]. Since the malignancies associated with underlying immunodeficiency states are not those common in the

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general population, it would appear that most adult malignancies do not reflect underlying immunodeficiency. It is more likely that a combination of genetic factors, chronic immune system stimulation (possibly as a result of recurrent infections), the presence of infectious carcinogenic agents (e.g., viruses), chronic chemical carcinogenesis, and other undefined factors leads to the high incidence of certain cancers in patients with primary or secondary immunodeficiency states. There is evidence to indicate that certain carcinogens – for example, asbestos – can suppress immune functions such as NK activity [430]. However, for the majority of common cancers, the overwhelming evidence suggests that immunodeficiency arises secondarily as a consequence of cancer and the therapies used to treat it; that is, cancer itself is an immunosuppressive disease. Cancerassociated immunodeficiency is further influenced by other factors, including age and genetic background, as well as environmental factors, such as nutritional status, stress, and infections. For example, nutritional status is frequently impaired in patients with head and neck cancer [87], which accounts for many of the immunodeficiencies reported in these patient populations such as decreased T cell numbers. Thus, it is the balance of many different endogenous and exogenous factors that ultimately contributes to the overall immune deficiency state of cancer patients.

times impossible) to directly compare the results of in vitro and in vivo immunologic assays from different studies. Nevertheless, a number of general conclusions have been reached concerning cancer-associated immune suppression. No single explanation, or generally agreedupon concept, has emerged to explain the immunodeficiency. Rather, there is a complex set of interactions involving a number of different mechanisms. This multifactorial basis of immunodeficiency is outlined conceptually in simplified form in Fig. 1. The scheme is equally applicable to T−, B−, NK−, or phagocytic effector-cell immune mechanisms. Five major factors each play a role in determining the immune responsiveness of cancer patients: (a) the proportions and absolute numbers of circulating, tissue-derived, or intratumoral effector cells; (b) the intrinsic functional capabilities of the effector cells on a per-cell basis; (c) the influence of immunoregulatory helper and suppressor cells; (d) the influence of local systemic-circulating and immunomodulatory soluble factors; and (e) the influence of systemic treatment. In Fig. 1, it is shown schematically how the relative contributions of these five factors modulate immune responsiveness of cancer patients as assessed with in vitro and in vivo assays.

Multifactorial Basis of Immunodeficiency in Cancer Patients

Any basic immune response reflects both the number (or relative proportion) of effector cells present and the intrinsic functional capability of the effector cells. Thus, impaired immunity can result purely from a deficiency in absolute numbers (or proportions) of effector cells

Effector Cell Numbers and Function

Because of subtle variations in methodologies employed by different investigators, it is often difficult (and some-

Helper Cells

Tumor-derived Factors

Ontogenesis

Precurser (Stem) Cells

Local Immunomodulatory Factors

EFFECTOR CELLS

Immune Boosters (adjuvants)

Lymphokines

EFFECTOR CELLS FUNCTION

In Vivo Assays

IMMUNITY

In Vivo Assays

Suppressor Cells

Serum Inhibitory Factors

Figure 1. Multifunctional basis of immunodeficiency in cancer patients

Cancer Therapy (i.e. RT, Chemo)

Robert K. Oldham that otherwise exhibit normal function on a per-cell basis, from effector cells that exhibit intrinsic functional defects despite normal cell numbers, or from a combination of both decreased cell numbers and impaired function of the individual cells. The primary immunodeficiency syndromes, such as the DiGeorge syndrome, ataxia-telangiectasia, and severe combined immunodeficiency syndrome (SCID), are examples of immune deficiency resulting from defective ontogenesis of the immune system. However, since the development of the immune system occurs during fetal and neonatal life, defects in ontogeny are not a consideration in the immune deficiency of cancer patients. Cancer patients do, however, often exhibit lymphocytopenia and decreased T-cell numbers [75, 101, 320, 352, 376, 384, 416, 481, 547], which contribute to their overall state of immunodeficiency. In contrast to primary immunodeficiency states, the effector cell abnormalities detected in cancer patients arise secondarily, probably as a result of the suppressive effects of cancer-derived factors on effector cell production and/or survival. When PBMC is used as the source of effector cells in a lymphocyte or monocyte function assays, it cannot be established whether a depressed functional immune response results from a decreased proportion of effector cells within the PBMC mixture, from intrinsic functional defects of the effector cells themselves, from the presence of excessive suppressor cell activity, or from a combination of abnormalities in cell proportions, functions, and immunoregulation. There is considerable evidence indicating that cancer patients exhibit depressions in mitogen and antigen-induced proliferative assays [75, 94, 97, 101, 102, 141, 171, 174, 197, 239, 284, 310, 320, 333, 352, 376, 408, 420, 429, 481, 547, 574] and in cytolytic activity [29, 287, 409, 496, 542] using PBMC as effector cells. In some cancers, for example, head and neck cancer [399] and Hodgkin’s disease [466], it has been possible using purified T cells to document intrinsic functional T-cell defects. Studies in cancer patients have shown an impaired ability of T cells to produce the lymphokine IL-2 [190, 321, 353] following activation by mitogens; but that spontaneous IL-2 production (reflecting possible stimulation due to circulating tumor antigens) is increased [235]. However, in Hodgkin’s disease, although IL-2 production and/or IL-2R expression of PBMC has been reported to be low [48, 359, 490, 580], the abnormality in T-cell lymphoproliferation does not appear to be related to defects in the IL-2 system [48]. Peripheral blood monocytes and polymorphonuclear leukocytes isolated from patients with a variety of cancers also exhibit depressed functional activity [31, 73, 103,

103 136, 172, 203, 487]. NK-cell activity is also frequently depressed in cancer patients [158, 409, 542]. At the local level, NK activity may be more impaired than other lymphocyte functions such as LPRs [17]. Thus, many studies now suggest that intrinsic functional defects of effector cells contribute, at least in part, to the immunodeficiency of cancer.

Immunoregulatory Cells The intrinsic functional capabilities of T, B, NK, and phagocytic cells are modulated by interactions with a variety of immunoregulatory cells. The T- and B-cell functions can be influenced either positively or negatively, depending upon the relative balance between Tind and Tc/s cells, as well as by number and function of T-regulatory cells (Treg)[178, 540, 582]. Once again, both absolute numbers (or proportions) and immunoregulatory function per cell are considerations in determining the overall influence of immunoregulatory cells on effector cell function. Another important immunoregulatory cell is the monocyte/macrophage. Most normal immune responses require the presence of monocytes/macrophages as accessory cells for optimal processing of antigen and appropriate activation of effector lymphocytes. In many disease states, including cancer, monocytes/macrophages exhibit suppressor-cell activity rather than helper-cell activity [540]. It is likely that such “suppressor” cells may develop in cancer patients to release factors capable of suppressing tumor growth as their primary action and thus that the suppression of immune reactivity is an “innocent bystander” effect. The influence of monocytes/macrophages is dependent upon cell numbers (or proportions) and their state of activation [540]. There is considerable evidence for immune suppression mediated by activated monocytes/macrophages in cancer patients [5, 28, 30, 50, 80, 193, 194, 195, 250, 257, 330, 461, 523, 532, 540]. For example, monocyte-mediated suppression of lymphocyte-proliferative functions have been demonstrated in Hodgkin’s disease [154, 175, 189, 336, 454, 535] as well as in patients with lung cancer [5, 93, 250], breast cancer [194, 253], malignant melanoma [363], colorectal cancer [28, 194, 524], head and neck cancer [30, 50, 550], bladder cancer [195], and a variety of other malignancies [86, 540]. Monocyte-mediated suppression of cytolytic effector-cell activity has also been demonstrated in cancer patients [14, 18, 123, 151, 228, 229, 540], including NK-cell activity [246], and autologous T-cell-mediated anti-tumor cytotoxic responses [151, 461]. In comparative studies, it has been demonstrated that such suppressor-cell activity is of

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greater magnitude at the local level (i.e., intratumoral, effecting TIL cells and in draining lymph nodes) than in the systemic circulation [14, 18, 123, 228, 229]. Of interest is the finding that monocyte/macrophages activated to kill cancer cells can suppress T-cell cytotoxicity toward the very same cells [532]. The contribution of suppressor lymphocytes to the generation of cancer-associated immunodeficiency is less certain and still somewhat controversial. Several studies that identified helper and suppressor T-cells on the basis of the presence of surface Fc receptors for IgM (Tμ cells) or IgG (Tγ cells), respectively, have suggested that the Tind/Tc/s ratio is depressed in cancer patients [204, 267, 531]. However, more recent studies using monoclonal antibodies to detect surface antigens indicate that the relative proportions of Tind and Tc/s cells are preserved in most untreated cancer patients, unless they have extremely widespread disease [130, 200, 266, 310, 462]. Few reports have focused on functional aspects of suppressor lymphocyte activity in cancer patients. Definitive conclusions are lacking, although such activity has been reported in patients with Hodgkin’s disease [217, 480] and various solid tumors [151, 236, 237, 283, 537]. Inducible suppressor T-cell activity has generally [104, 183, 236, 464] but not always [521] been found to be depressed in cancer patients. Over the last 10 years, studies of immunoregulation have focused increasingly on a subset of T-cells called T-regulatory cells (Treg). Tregs have been well defined as a distinct population of CD4 T-lymphocytes, which constitutively express CD-25 and are further characterized by the molecules CTLA-4, FOXP-3, and a TNF receptor. Treg cells also produce immunosuppressive cytokines, such as IL-10 and TGF beta [307, 444, 467]. Treg cells with the phenotype CD-25+, FOXP-3+, CD-127− have been found in tumor specimens and are suspected as cells which suppress the activation of CD-4− and CD-8+ tumor-infiltrating lymphocytes active in tumor destruction. The presence of these cells correlate with poor clinical outcome in cancer patients [218, 450, 467]. Clinical studies are now underway, using antibodies to CTLA-4, to attempt to lessen the immunosuppressive effects of Treg and, thereby, enhance the effectiveness of the CD-4 and CD-8 T-cells and immune effectors [573].

Immunomodulatory Factors It is now well established that, in normal immune reactions, the influence of immunoregulatory cells is mediated at least in part by the local release of cytokines such as IL-1 by monocytes, and IL-2, 6 and 10, as well as γ-interferon by helper T cells (see Chapter 8). In a vari-

ety of disease states including cancer, there may be a deficiency in the production of cytokines by cells that normally produce them [159, 190, 206, 279, 353, 360, 548, 572, 579]. The release in cancer patients of a variety of immunomodulatory factors produced by monocytes/macrophages and/or the tumor cells themselves has been described. Immunosuppressive factors, for example, the E series of prostaglandins, are released in excessive quantity from both monocytes/macrophages [5, 28, 30, 50, 80, 154, 189, 195, 363, 386, 453, 523] and tumor cells [72, 139, 140, 221, 261, 358, 523], which could suppress cytolytic activities [358] and proliferative functions [123] of TIL cells as well as of circulating lymphocytes. However, prostaglandins alone do not mediate the complete suppressor cell activity of monocytes [28, 30, 154, 453, 523]. Monocyte-derived toxic oxygen metabolites, for example, hydrogen peroxide [336], and other as yet undefined mediators also appear to play a role. Increased monocyte production of prostaglandins has been shown to directly impair lymphocyte proliferative and cytolytic functions [139, 140] as well as the phagocytic function of monocytes themselves [150]. A variety of other factors have been identified that are shed by tumor cells and modulate both local as well as systemic immune responses. These include tumor-associated glycoproteins [536] and lipids [196]. For example, various melanoma-associated gangliosides have been shown to both up-regulate and downregulate lymphocyte responses to IL-2 [230]. Thus, it has been suggested that the unique tumor-antigen-associated phenotype of each individual tumor (based on the proportion of various immune-suppressing and augmenting factors released by it) determines whether the individual tumor will exhibit immune stimulation or suppression. In this regard, it has been demonstrated that whereas primary melanomas stimulate autologous lymphocyte responses, metastatic melanomas suppress immune responsiveness [510]. It is also apparent that a number of different substances with immunosuppressive properties can be detected in the blood of patients with cancer [469]. Many investigators have shown that serum from cancer patients is immunosuppressive in that it suppresses mitogen and antigen responsiveness of lymphocytes from normal donors [11, 55, 98, 164, 182, 188, 226, 416, 421, 475, 482, 502]. Cancer serum inhibitory factors include acute-phase reactants, such as α1-acid glycoprotein [39, 509], α-globulins [234], C-reactive protein [383], and immune complexes [35, 259]. A serum factor in young cancer patients has been reported to inhibit serum thymic-hormone bioactivity [121]. Circulating immune

Robert K. Oldham complexes have been shown to produce immunosuppressive effects by a variety of mechanisms including (a) blocking of B-cell differentiation and antibody production [435, 516]; (b) stimulating the production of anti-idiotype antibody which then interferes with the immune response to the original antigen [435, 516]; (c) inducing suppressor T-cells [105]; (d) reducing IL-2 levels [418]; and (e) blocking Fc receptors on effector cells [168]. Theoretically, the quantitative removal of tumor antigens, antitumor antibodies, and/or immune complexes could lead to a specific or nonspecific stimulation of the immune system, leading to an increase in general immune competence as well as in specific antitumor immune responsiveness. This has formed the basis for therapeutic trials with extracorporeal treatment of cancer with immobilized staphylococcal protein A [335, 362] and for attempts at plasma ultrafiltration. The mechanism of antitumor activity of such approaches has still not been defined. However, plasmapheresis has been associated with increased LPRs and antitumor immune responses [468, 470], probably due to removal of immunosuppressive serum factors. In conclusion, it is clear that the state of immunocompetence of an individual cancer patient is dependent upon a number of complex interactions among effector cells, immunoregulatory cells, and local and systemic immunomodulatory factors. A simplified explanation for the immunosuppression of cancer is that products released from the malignant cells themselves lead to (a) activation of suppressor cells; (b) impaired effector cell production and survival; and (c) direct inhibition of effector cell function. In assessing the state of immune competence with in vitro and in vivo assays, the underlying basis of immunodeficiency may or may not be identified.

Immunosuppression and Tumor Cell Burden In newly diagnosed, untreated cancer patients, the degree of immunodeficiency generally parallels the extent of disease [564]. The most reasonable explanation for such an association is that the release of tumor-derived immunosuppressive factors relates directly to the tumor cell burden. Immune parameters of which impairment correlates with extent of disease include DTH to recall antigens, blood effector cell levels (e.g., T-lymphocyte levels), lymphocyte functions, including proliferative responses to mitogens and antigens, cytotoxic activity, phagocytic cell activity, serum immunoglobulin levels, and primary antibody responses to a variety of immunizing antigens. Whereas quite early cancer is associated with only subtle

105 abnormalities of immune competence, more advanced disease, particularly after treatment, leads to abnormalities in all measurable immune parameters [131].

Solid Tumors Delayed-Type Hypersensitivity (DTH) Many reports have confirmed that as the extent of disease increases, the incidence of positive DTHS reactions decreases [457]. For example, in one large study of 234 patients with various types of cancer, patients without metastases exhibited positive reactions to DNCB (83%) more often than those with regional metastases (67%) or with distant metastases (41%) [401]. Similar findings using both DNCB as well as recall antigens have been noted in a wide variety of solid tumor-bearing patients, including those with breast cancer [2, 34, 36, 75, 76, 146, 296, 496], gastrointestinal cancer [76], head and neck cancer [495], lung cancer [8, 227, 389, 350, 561], renal cancer [86, 355], gynecologic cancer [561], urologic cancer [39, 85, 456], malignant melanoma [145, 408], sarcomas [145], and primary brain cancers [84, 317]. The incidence of positive DTH responses varies according to type of cancer. For example, patients with localized head and neck cancer had a much lower reactivity (42%) than patients with sarcomas (73%) and lung cancer (80%) [76]. This result has been explained, at least in part, by the alcohol intake and general state of malnutrition associated with head and neck cancer patients [54, 311]. In another study, it was found that the correlation between DNCB reactivity and clinical status was more pronounced in patients with squamous-cell carcinomas of the head and neck than in those with sarcomas or melanomas [562]. These findings suggest that although DNCB reactivity generally correlates with extent of disease, the relationships are modified depending upon the particular type of cancer. It has been easy to demonstrate the marked degree of impairment in DTH reactions found in patients with metastatic cancer; however, it has been much more difficult to discern relative differences in reactivity of patients with similar stages of disease whose tumors differ in size, regional lymph-node involvement, or local invasiveness. Therefore, DTH responses are insensitive immunological tests [101].

Lymphoproliferative Responses (LPR) An exhaustive literature has accumulated in which various in vitro lymphoproliferative assays were employed to assess the state of immune competence of cancer

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patients. In general, PBMC were the responder cells, and T-cell mitogens (e.g., PHA, Con A) were used to induce blastogenic transformation. Many reports have documented an inverse correlation between PHA response and stage of disease for patients with a variety of solid tumors. For example, among 179 patients with gastric carcinoma, 87% with stage I-II, 49% with stage II, and only 24% with stage IV disease could exhibit morphological evidence for blastogenic transformation of PBMC following exposure to PHA [376]. A study of 154 patients with carcinoma of the lung revealed that lymphoproliferative responses were significantly decreased in patients with stage III disease, but not in those with stages I and II [547]; other studies have reported similar results [102, 141, 197, 420]. Depressed LPR to alloantigens in mixed leukocyte culture (MLR) were observed in 46% of patients with small (TINOMO) stage I lung cancers [97]. Depressed mitogenic responsiveness has been correlated with advancing stage of disease in breast cancer [49, 239, 320, 333, 464] and, in one study, lymphocyte responses to PHA were impaired in earlier stages of disease than was DTH reactivity [496]. Similar inverse correlations between stage of disease and LPRs have been noted in colorectal cancer [171], malignant melanoma [174, 284, 481], and head and neck cancer [101]. Although many reports have documented that LPR generally decrease with advancing stage in solid tumor patients, this finding has not been universal. For example, lack of correlation between blastogenic responses and disease stage has been reported in patients with breast cancer [71, 310, 429], malignant melanoma [94, 174, 408], and colorectal cancer [352]. These reported inconsistencies have probably resulted from differences in techniques and quality control procedures for assays with a great deal of inherent variability. Nevertheless, the same general conclusion holds for in vitro LPR and DTH skin testing, namely, that there tends to be an inverse correlation between immune reactivity and tumor burden and/or stage of disease.

Immune Cell Quantitation There are many monoclonal antibodies available to quantitate blood, organ, and intratumoral levels of various immune effector cells; however, most of the early observations concerning lymphocyte quantitation and cancer were made using more primitive assay methods. The quantitation of lymphocytes in the peripheral blood of cancer patients has been studied as a measure of immunocompetence since the early 1920s, when lymphocytopenia was found to be common in patients with

advanced malignancies [578]. Other studies found an inverse correlation between total lymphocyte count and stage of disease in breast [416] and lung cancer [547]. The observation that human T lymphocytes could be easily identified by a binding reaction to sheep red blood cells to form E rosettes (E-RFC), coupled with the emerging recognition of the importance of T cells in immune responsiveness, led to numerous studies on cancer patients. Using E-rosette techniques, the percentage of circulating T cells has been determined for patients with a wide variety of solid tumors and correlated with clinical stage of disease [320, 481, 547, 567]. Other studies have not found such a correlation [75, 352, 376]. In general, however, as with the in vitro assays of T-cell functions, peripheral blood T-cell numbers tend to decrease in association with more advanced stages of cancer. Although assessments of B cells, monocytes, and Tind and Tc/s ratios have been performed less frequently in cancer patients, in general, B-cell numbers have paralleled T-cell numbers [266, 310, 352, 440], whereas absolute monocyte counts tend to increase with advancing disease [310]. T-cell subset abnormalities have been found in some patients with malignant melanoma [266], head and neck cancer [130, 204], and lung cancer [13, 527, 565]. T-cell subset abnormalities were more pronounced in lung lavage cells than in PBMC from patients with lung cancer [160], suggesting that such perturbations occur first at a local level before systemic abnormalities become detectable. In general, abnormalities of the Tind and T c/s ratios are found in patients with advanced or progressive disease. The ratio between Treg and CO8+ cytotoxic T cells correlates with immunosuppression and clinical outcome [218, 450].

Cytolytic Functions The measurement of nonspecific lymphocyte-mediated cytotoxicity has been employed with increasing frequency as part of the general assessment of immune competence in patients with solid cancers. In general, cytotoxic activity (most often NK activity) was depressed in cancer patients, particularly those with metastatic disease, but clear correlations have not been identified between impaired function and clinical stage of disease [262, 307, 505, 542]. Studies in patients with small-cell lung cancer and stage I and II malignant melanoma have found an inverse correlation between NK activity and amount of clinically detected tumor [158]. Similarly, NK-cell activity was more likely to be depressed in stage II breast cancer than in stage I disease. A large study of 247 cancer patients showed that

Robert K. Oldham circulating NK cell numbers, assessed by monoclonal antibody methods, were significantly reduced in patients with colon, lung, and breast cancer, but not in those with melanoma or sarcomas [29]. Thus, a depression of NK cell numbers could explain the depressed NK function reported in some, but not all, cancer patients [3]. The relationship between NK activity and other measures of immunocompetence has been explored. A lack of association was found between DTH reactivity to PPD and NK activity [409]. A comparison between TIL activity and PBMC revealed that TIL expressed diminished NK activity compared with PBMC [225]. In one study, although PBMC exhibited depressed NK activity, proliferative responses to PHA and in MLR were maintained [409]. This suggested that cytolytic and proliferative effector-cell mechanisms represent distinct functional entities.

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Phagocytic Cell Function Other impairments of immune responsiveness in solidtumor patients have been documented. For example, the inflammatory response of patients with advanced cancer is associated with a reduced capacity to mobilize monocytes [31, 137, 172, 546]. Reticuloendothelial function in patients with breast and colorectal cancer is depressed [138]. Depressed monocyte chemotaxis has been correlated with disease stage for a variety of tumor types [73, 203, 487]. Detailed evaluations of monocyte function in solid-tumor patients reveal abnormalities in patients with malignant melanoma, breast cancer, colorectal cancer, and head and neck cancer, but no consistent correlations have been identified between tumor type, monocyte defect, and clinical stage of disease.

Correlations Among Immune Cell Numbers and Function Antibody Formation A variety of humoral immune abnormalities have been found to occur in association with solid tumors. A large study of 984 patients with nonhematopoietic cancers found no general trends, but did find increases in serum IgG and IgA in males with skin and lung tumors, increases in IgM in males with sarcomas and females with melanoma, decreases in IgM in patients with ovarian cancer, and increases in IgA in patients with oral, gastrointestinal, and uterine cancers [238]. Increased IgA has also been demonstrated in head and neck cancer [319, 552] and prostate cancer [6], but to date, no correlations have been observed between serum immunoglobulin level and clinical stage of disease [125]. The serologic response to several different B-cell immunogens has also been studied in solid-tumor patients. Patients with nonlymphomatous malignancies were found to exhibit decreased specific antibody responses to Salmonella extract [297]. Patients with stage III squamous-cell lung cancer exhibited deficits in IgG and IgA production following immunization with Helix pomatia hemocyanin, a T-cell-dependent antigen [248]. A significant impairment in the ability of certain patients with solid tumors to produce both IgM and IgG antibody in response to primary challenge with monomeric S. Adelaide flagellin has been reported [297]. Both complete and incomplete primary antibody responses to heat-killed Brucella were reduced in patients with breast and lung cancer [544]. However, precise kinetic data for humoral antibody production in most patients with solid tumors are lacking, as are correlations between humoral immunity and extent of disease [143].

A number of studies have attempted to find correlations between in vitro and in vivo abnormalities of immune cell numbers and function. For example, both in vitro PHA responses and in vivo DNCB reactivity were normal in patients with early bladder cancer, but significantly impaired in patients with advanced disease. Similar correlations have been seen in patients with lung cancer [424] and breast cancer. In contrast, in a study of 48 patients with lung cancer, LPRs were more often suppressed than were skin test responses [8], and no correlations between DNCB reactivity and in vitro immune functions were found in patients with head and neck cancer. It has also not been possible to identify any consistent association between alterations in effector-cell numbers and function [103, 251].

Hematopoietic Malignancies Reed’s report in 1902 that patients with Hodgkin’s disease (HD) failed to react to tuberculin skin tests even if they were known to have had active tuberculosis [410] led to a vast number of immunologic studies for this malignancy. Many of the immune abnormalities first reported – for example, alterations of absolute lymphocyte counts, impairments of T-cell LPR, and the presence of suppressor monocytes/macrophages – were subsequently also found in patients with a variety of other cancers. Even though the primary immune defects described in untreated patients with HD involve T-cell immunity, other defects have also been documented [58, 264, 433] including impaired in vitro B-cell production of antibodies, phagocytic cell function, and NK-cell activity [161].

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The clinical relevance of the T-cell immunodeficiency in patients with HD has been recognized for many years [419]. Patients with HD have an increased susceptibility to infections associated with defective T-cell immunity, including Pneumocystis carinii pneumonia and viral infections such as herpes simplex, herpes zoster, and cytomegalovirus [22, 433]. In most of these studies, however, it has been difficult to assess the role of the treatment for HD (radiation therapy, chemotherapy) in exaggerating the T-cell immune deficiencies, since many of the infectious complications occurred only during or after the completion of therapy. A number of studies have now attempted to correlate defects in T-cell functions with depression in T-cell numbers in untreated patients with HD [71, 224, 460]. In general, no such relationships could be identified, although lymphocytopenia patients were more likely to exhibit impaired LPR. There is an easily identifiable correlation between defects in immune responsiveness and clinical stage of disease, in that most immune abnormalities are more readily apparent in patients with advanced stages of disease than in those with localized disease [460]. Immune deficiencies have also been shown to correlate with lymphoma subtype and extent of disease in the non-Hodgkin’s lymphomas. These include impaired in vitro LPR to mitogens [12, 312] and impaired in vivo DTH responses [12]. In general, patients with highgrade lymphomas exhibit more profound abnormalities than those with more favorable histologies [258]. It has been very difficult to relate the extent of immunodeficiency to tumor burden in patients with cancers involving the bone marrow (e.g., leukemia, multiple myeloma) since, with the exception of multiple myeloma, staging systems based on tumor cell burdens do not exist. However, a wide variety of in vitro as well as in vivo abnormalities have been documented in patients with lymphoid and nonlymphoid leukemias [199, 209]. Furthermore, a spectrum of intrinsic functional abnormalities has been identified in B cells and also purified T-cell populations of patients with chronic lymphocytic leukemia and multiple myeloma [236, 247]. Both of these diseases are often associated with profound depressions of normal serum immunoglobulin levels and impaired ability to mount primary humoral immune responses.

Prognostic Implications of Immunosuppression Since immunodeficiency generally correlates with the stage and extent of disease, and since stage and extent of

disease are the most important prognostic indicators for any particular cancer, it is logical that the general state of immunocompetence and prognosis should be closely related. The potential importance for correlating immunocompetence and prognosis at the time of diagnosis or at the onset of therapy is obvious [155]. Assessment of immune status could, in theory, help to select patients with a poor prognosis who might require more aggressive therapy than usual, or adjuvant therapy even if all disease appeared to be surgically excised. In a now classic study, it was observed that patients who could be sensitized to DNCB and freed of disease by surgery had a good prognosis, whereas those who were apparently freed of disease by surgery but could not react to DNCB had a poor prognosis and relapsed within 6 months to 1 year [562]. The DNCB responses of patients in the poor prognosis group were identical to those of patients who were found to be inoperable at surgery. The two groups of patients were otherwise comparable with regard to type of tumor, extent of disease, and all other usual clinical prognostic factors. This report formed the basis for a number of subsequent studies attempting to correlate immunodeficiency with prognosis for previously untreated patients with solid tumors and hematopoietic malignancies.

Solid Tumors Since 1970, there have been numerous attempts to correlate impaired DTH skin reactions with prognosis. Associations between impaired DNCB reactivity and disease recurrence have been observed in lung cancer [299], head and neck cancer [318, 441], gastrointestinal cancer [77], and breast cancer [146]. A number of reports have suggested that patients with or without metastases but without reactivity to DNCB have a poor prognosis [74, 85, 147, 265, 298, 318, 402]. Lack of reactivity to common skin test recall antigens has also been correlated with poor prognosis in breast [160, 349], lung [15, 244, 256, 299], gastrointestinal [382], urologic [334], and head and neck cancer [494], although this has not been a universal finding [54, 296, 350, 361, 397, 406, 452]. Several studies have subcharacterized patients with identical clinical stages of disease on the basis of impaired skin test reactivity to define further the relationship between anergy and prognosis. Such correlations have been found, for example, in patients with stage I [19] or stage III and IV [295] malignant melanoma, and in limited-disease small-cell lung cancer [256]. However, other studies of accurately staged patients with breast cancer, although DNCB-negative patients had a worse overall survival, when survival distributions of DNCB-positive and –negative patients

Robert K. Oldham with either primary operable or advanced breast cancer were compared separately, significant differences were not seen. Thus, studies to date have yielded conflicting conclusions concerning the correlation between impaired in vivo immunity and prognosis. Associations between poor prognosis and impaired in vitro LPR have also been reported [97, 392]. Other studies have not produced such correlations [94, 174, 429, 446]. Studies correlating absolute lymphocyte counts or absolute T-cell levels with prognosis have provided conflicting results [376, 479]. Furthermore, the use of multiparameter immunological assessments has not generally improved the ability to assess prognosis for previously untreated solid tumor patients [128, 174, 305, 320, 352]. However, some investigators have developed predictive indices based on multiple immunological parameters. For example, in one study, an integrated score of immunocompetence based on various in vivo and in vitro assays showed that the recurrence of breast cancer was significantly higher in suboptimal (61%) as opposed to optimal (28%) responders [3]. Similarly, an immunological staging system based on absolute lymphocyte counts and serum immunoglobulin level was found capable of predicting the outcome off stage III head and neck cancer patients in 86% of cases [268]. However, in a report using logistic regression methodology, it was demonstrated that only the level of complement binding activity, which may reflect levels of circulating immune complexes, correlated with the likelihood of responding to induction chemotherapy [452]. No associations could be determined between response to chemotherapy and abnormalities of a variety of other immune parameters, including lymphoproliferative responses, NK activity, lymphocyte subset numbers and percentages, and serum immunoglobulin levels.

Hematopoietic Malignancies Among the hematopoietic malignancies, most attention has focused on correlating defects in T-cell immunity with prognosis in HD [488, 577]. More recent reports suggest that there is a correlation between extent of immune dysfunction and prognosis [57, 153, 533]. Relationships between immunocompetence and prognosis have also been reported for a variety of other hematopoietic tumors. For example, in acute leukemia, patients with showed DTH skin reactivity and, to a lesser degree, in vitro blastogenic responses to mitogens exhibited the best overall survival, outranking such prognostic variables as age, type of leukemia, and absolute blast cell count [177, 303, 304]. In chronic lymphocytic leukemia,

109 both cell-mediated and humoral immune functions have been found to correlate with prognosis [59, 120]. While DTH was only moderately decreased, diminution in antibody responses and PHA responses correlated with the duration of disease, status of therapy, degree of lymphocytosis, and immunoglobulin levels [120]. A correlation has been reported between depressed absolute circulating NK-cell levels and poor prognosis in patients with largecell lymphoma [38]. Patients with high-grade lymphomas who have high levels of serum IL-2 receptor have been shown to have more advanced disease [410] and a worse prognosis [543]. However, in this instance, the IL-2 receptor is synthesized by the tumor cells so that serum levels parallel tumor cell bulk. Nevertheless, the predictive value of soluble IL-2 receptor was superior to that of other markers that reflected tumor cell bulk such as lactic dehydrogenase level (LDH) or clinical stage [410].

Perioperative Immunosuppression Although it is perhaps not universally recognized, the operative procedure and its associated general anesthesia result in a variety of transient immunological defects that can persist for several weeks after surgery [559]. During operative procedures under general anesthesia for a variety of benign and malignant conditions, patients exhibit inhibition of skin reactivity to DNCB [511] and DTH recall antigens [527], suppression of circulating T-cell levels [273, 528, 529], diminished LPR to PHA and other mitogens [260, 437, 483], and depressed NK activity [456, 513]. Patients with cancer appear more likely to experience these periods of postsurgical immunosuppression than do patients who undergo surgery for benign conditions. Among the conditions associated with the greatest degree of postoperative immunosuppression are intraabdominal and intrathoracic procedures, blood transfusions, and longer operating times [439, 471].

Perioperative Blood Transfusion Several studies have suggested that perioperative blood transfusion, possibly by inducing a greater degree of immunosuppression, results in an adverse effect on prognosis for postoperative patients with colorectal cancer [222], breast cancer [514], non-small-cell lung cancer [512], prostate cancer [205] and soft-tissue sarcoma [434]. However, three recent studies in breast cancer [541], colorectal cancer [550], and lung cancer [271] have not confirmed initial reports. Thus, it has not been conclusively proven that perioperative blood transfusions worsen the prognosis of patients with cancer. It is possible that the requirement for transfusion is a marker for other risk

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factors such as advanced stage of disease, need for more extensive operation, or greater blood loss during surgery, thus accounting for the worse prognosis following surgery. The precise mechanisms for postoperative immune suppression have not been fully defined. Among the considerations are the immunosuppressive effects of surgical stress [124], or of the anesthetic agents themselves [511], a relative decrease in circulating T-cell levels compared with other cell types [180, 181], and/or the generation of suppressor cells [360]. In nonsurgical patients, chronic blood transfusion is associated with depressed Tind/Tc/s ratios and impaired NK activity. Theoretically, the associations between perioperative blood transfusion and earlier cancer recurrence, and between prolongation of renal allograft survival and transfusion, may be attributed to a transfusion-induced immune suppression resulting from a graft-versus-host reaction mediated by transfused T-lymphocytes. Although the precise mechanisms to explain perioperative immune suppression have not yet been defined, this well-documented abnormality has nevertheless formed the basis for a number of therapeutic trials in which various putative immunorestorative agents have been administered as surgical adjuvants.

Radiation Therapy-induced Immunosuppression The immunological effects of external-beam radiation therapy have been delineated in detail. Radiation therapy to a variety of portals, including mediastinal [146, 273, 306, 371, 498], pelvic [65, 306, 375, 413, 498], head and neck [306, 371, 483, 494, 551], lymphoid [165, 185, 432], and breast [33, 191, 306, 413, 522, 556] portals, results in similar acute and chronic changes characterized by a generalized lymphocytopenia involving primarily a depletion of circulating T cells as well as marked depressions in various T-cell functions such as in vitro LPRs to mitogens and antigens and in vivo DTHS reactions [265, 484]. The depression of T-cell numbers and function occurs progressively with radiotherapy. The magnitude of immune depression reflects both the dose of radiation received and the volume of tissue, blood, lymph, or bone marrow included within the radiation portals. This acute immune suppression is short-lived, and substantial recovery is apparent within 3 weeks of cessation of therapy. However, most patients show a modest chronic depression in both numbers and functions of T cells, which may last for years following the completion of radiotherapy [252]. A number of other observations have been made concerning the mechanism of functional immune impairment

following radiation therapy. Mediastinal irradiation for treatment of localized lung cancer has been associated with a decrease in proliferative responses of purified peripheral blood T cells, suggesting that radiation directly impairs their functional capabilities [462]. Several studies have assessed the effects of radiotherapy on T-cell subset proportions. Although there was a drop in the absolute numbers of both helper and cytotoxic/ suppressor T-cells following mediastinal irradiation, the drop in cytotoxic/suppressor T-cells was greater, so that treatment resulted in a significant increase in the Tind/Tc/s ratio [462]. These observations are consistent with in vitro functional data indicating that suppressor T-cells are more radiation-sensitive than helper T cells [184, 398]. In contrast, radiotherapy for patients with breast cancer [452, 397], head and neck cancer [249], and Hodgkin’s disease [404, 432] has been associated with a relative increase in the proportion of T cells bearing surface antigens and/or Fc receptors (IgG) of cytotoxic/ suppressor cells, leading to a decrease in the Tind/Tc/s ratio. Indeed, in postradiotherapy patients with breast cancer [397] and Hodgkin’s disease [185], helper T-cell levels remained low for years after irradiation. Several studies have assessed the influence of therapeutic irradiation on suppressor cell function. They indicate that radiation therapy can activate suppressor monocytes [63, 68, 313] as well as increase the sensitivity of lymphocytes to the suppressive effects of prostaglandins [313]. External-beam radiotherapy, such as pelvic [375, 413, 498, 499] or chest wall [64, 513, 498, 499, 522, 556] radiotherapy, has also been associated with a decrease in B-cell and NK-cell numbers and functions in many, but not all, reports. Mediastinal irradiation more severely depressed NK activity than treatment to nonmediastinal sites [332], possibly reflecting the relatively large volume of blood and/or lymph node volume included within the mediastinal radiation portal, leading to damage of NK cells, or their more radiation-sensitive precursor cells. However, within 3–4 months following the completion of radiotherapy, NK-cell activity returned to pretreatment levels, which then persisted for at least 2 years [67]. There was a partial recovery in B-cell function, which remained below pretreatment levels for 12–18 months after completion of therapy [438, 500]. Reports concerning the effects of radiotherapy on absolute blood monocyte levels have been conflicting [522, 549]. Other immunological parameters have not been significantly affected. For example, radiotherapy does not produce changes in serum immunoglobulin levels or neutrophil function. However, the ability of monocytes to differentiate into macrophages was impaired in breast cancer

Robert K. Oldham patients treated by radiotherapy [515], and absolute monocyte levels increased after treatment [522], whereas pelvic radiotherapy produced a decrease in both monocyte numbers and functions in patients with colorectal cancer [549]. In the earlier literature it was not possible to correlate the extent of radiotherapy-induced immunosuppression with relapse or survival [133, 462, 555]. In general, however, patients who exhibited skin reactivity to DNCB prior to radiotherapy had a better prognosis than those who did not [79]. In two more recent studies of patients who received primary radiation therapy for breast cancer [499, 555] and/or cervical cancer [499], those who exhibited the greatest postradiotherapy depressions of LPRs to mitogens or antigens had the shortest survival [555]. Several studies on postradiotherapy patients with lung cancer have serially assessed the immune status of those who responded transiently to treatment but relapsed at a later date [133]. Lung cancer patients who responded clinically to radiotherapy showed some improvement of absolute T-cell levels in the months following cessation of treatment, whereas those who progressed did not show such partial recovery [133]. In addition, for postradiotherapy patients with locally advanced non-small-cell lung cancer, there was a gradual and progressive decrease in T-cell and helper T-cell percentages, and in the Tind/Tc/s ratio that preceeded relapse [462].

Chemotherapy-induced Immunosuppression It has been much more difficult to assess the effects of cancer chemotherapy than of radiation therapy on immune responsiveness. In part, this is due to the fact that a wide variety of different cancer chemotherapy drugs are available for clinical use, many of which can be administered by a variety of routes and doses, either alone or in combination with other drugs. The majority of anticancer drugs produce a dose-dependent pancytopenia, which itself is immunosuppressive because of the associated granulocytopenia. In addition, most, if not all, cancer chemotherapy drugs exhibit immunosuppressive properties as assessed with conventional in vivo and in vitro assays. This includes the alkylating agents, antimetabolites, and antitumor antibiotics. Cancer chemotherapy may lead to profound depressions of cellular as well as humoral immunity [202, 207, 213]. Newly acquired DTH and primary humoral immune responses appear to be more sensitive to drug-induced immunosuppression than are secondary responses. Less often, the administration of selective drugs, for example, cyclophosphamide (CTX), at low doses can lead to a

111 temporary enhancement of immune responsiveness due to preferential inhibitory effects on suppressor cells. Traditionally, it has been felt that intermittent chemotherapy schedules of administration using single or multiple drugs tend to be associated with relatively little effect on DTH responses and with transient depressions of lymphocyte numbers, in vitro LPR, antibody responses, and inflammatory responses, with at least some recovery several weeks after discontinuation of treatment [210, 417]. In contrast, continuous therapy, if given in adequate doses, has been shown to lead to a progressive decline in all phases of immune reactivity [166, 207, 210, 331, 417], which is reversible after the cessation of administration of drug(s). In several more recent studies, however, it has been demonstrated that intermittent combination chemotherapy regimens lead to cumulative depressions of lymphocyte numbers and functions over months to years [315, 501], which may or may not be reversible. These changes include depressions of absolute T- and B-cell levels, depression in the Tind/Tc/s ratio, and depressions of LPR to mitogens and antigens. Another phenomenon that has been described is the recovery or transient, rebound overshoot of immune responsiveness after a single cycle of chemotherapy [81, 108, 201]. Rebound is found in patients who are responding clinically to treatment. Patients whose immune functions remain suppressed either have not responded clinically to treatment or are at high risk for relapse compared with those who exhibit recovery to levels above those pretherapy. It has been suggested that the rebound overshoot in immune reactivity following chemotherapy may be due to a reduction in monocyte suppressor cell function [81]. The effect can result from a transient, chemotherapy-induced decrease in relative numbers of monocytes/macrophages, from a reduction in suppressor cell function on a per-cell basis, or from a combination of both. Recovery of suppressor monocyte/ macrophage function is responsible for the eventual decline in immune function following drug-induced rebound overshoot.

Antimetabolites All of the antimetabolites commonly used for treating cancer patients, including thiopurines such as 6-mercaptopurine (6-MP) and 6-thioguanine (6-TG), antifolates such as MTX, fluorinated pyrimidine analogs such as 5-fluorouracil (5-FU), cytosine arabinoside (Ara-C), and DTIC (5-[3-3-dimethyl-1-triazeno]-imidazole-4-carboxamide) are immunosuppressive in humans. 6-MP has been one of the most extensively studied agents [207, 213, 300]. Azathioprine, a nitroimidazole derivative of

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6-MP, is a potent immunosuppressive drug, and has found more use in clinical transplantation than as a cancer chemotherapy drug [343]. 6-MP, 6-TG, MTX, and 5-FU have all been shown to preferentially depress primary antibody responses and the development of new DTH reactivity [213, 343, 345, 346]. However, 5-FU treatment restored DTH to recall antigens such as PPD, mumps, and trichophytin [62, 345], but caused a transient decrease of in vitro LPRs to PHA and PPD [370]. Intravenous 5-FU produced a rapid (within 1–2 days) decrease in absolute T- and B-lymphocyte levels, which returned to baseline over the ensuing 1–3 weeks [152]. Ara-C has been shown to partially suppress primary and secondary antibody responses [117]. Although both MTX and Ara-C abolished established DTHS to recall antigens, Ara-C was much more potent in inhibiting DNCB reactivity [346]. In vitro MTX did not affect the phagocytic or cytolytic activities of human neutrophils [255]. DTIC has been considered only weakly immunosuppressive in humans, based on studies in patients with malignant melanoma in which only a minority of treated patients exhibited depressions in antibody production to typhoid vaccine or in DTHS reactions to primary sensitization [89]. More recent studies with DTIC have indicated that treatment is associated with a cumulative decrease of T-cell numbers, but no change in B-cell numbers [52]. A normalization of Tind cell numbers occurred after cessation of treatment.

Alkylating Agents The alkylating agents comprise a variety of drugs including cyclophosphamide (CTX), nitrogen mustard (HN2), chlorambucil (CLB), thiotepa (TT), and busulfan (BS). These compounds have found widespread clinical use, particularly for the treatment of leukemias and lymphomas. Their antiproliferative effects also extend to normal host hematopoietic precursor cells of all lineages, including lymphoid precursors. In animals, these agents are potent immunosuppressants of antibody formation [447]. Recent clinical interest has focused on the novelty of CTX as an immunomodulatory agent [37, 144, 202, 207, 213, 216, 325, 380]. Administration of oral daily CTX maintenance therapy to patients with lymphomas did not result in interference with the development of normal humoral and cell-mediated immune response to keyhole limpet hemocyanin. Other studies have revealed that prolonged oral therapy with CTX can produce lymphopenia and suppress in vitro LPRs to PHA. CTX administered intravenously at conventional doses for 7 days inhibited the production of primary antibody responses, but did not significantly interfere with DTHS. Low intravenous doses of CTX (100–600 mg/m2) pref-

erentially decreased circulating B-cell numbers. Doses from 200 to 600 mg/m2 selectively depleted cytotoxic/ suppressor T cells, leading to a transient increase in the Tind/Tc/s ratio, whereas higher doses affected all T-cell subsets equally. Intravenous administration of conventional doses of CTX for 5 days has been shown to depress established DTH by 7–10 days after the cessation of therapy, at a time when the peripheral white blood cell count was at its nadir. Perhaps the most intriguing aspect of CTX-induced immune changes has been the elucidation of the selective immunopotentiating effects of CTX [144, 325]. For example, in a study of 22 patients with metastatic cancer, CTX pretreatment significantly augmented the development of DNCB reactivity as well as DTHS to new antigens [44], even though absolute lymphocyte counts fell within 1–2 days and did not recover for 21 days [46]. The T-cell, B-cell, and T-cell subset numbers were all affected equally. Lymphoproliferative responses to mitogens and alloantigens also fell significantly within a day, but recovered to pretreatment levels by day 3; some cases exhibited rebound overshoot by day 7. Inducible T-cell suppressor cell activity was also diminished within 1 day after CTX administration; however, in contrast to LPRs, suppressorcell activity remained significantly impaired on day 3 and only partially recovered by day 7. Thus, between 3 and 7 days after intravenous administration of CTX, there appears to be a preferential impairment of nonspecific T-cell-mediated suppressor cell activity, which could account for the augmented DTHS noted in CTX-treated patients. Most recently, a single intravenous low dose (300 mg/m2) of CTX was shown to inhibit the generation of inducible suppressor cell activity in cancer patients for up to 19 days without affecting lymphoproliferative responses to T-cell mitogens or the Tind/Tc/s ratio [45]. This CTX dose (300 mg/m2) 3 days prior to immunotherapy has been employed clinically in a variety of circumstances in an attempt to abrogate suppressor cell activity, for example, as an adjunct to active specific immunotherapy with a melanoma tumor cell vaccine [43], and in combination with low-dose intravenous IL-2 [344]. Although the mechanism by which CTX augments the immune response has not yet been elucidated, the leading hypothesis, at present, is an abrogation of suppressor-cell function, with blockage of the subset of helper T-cells that is the inducer of suppressor cells [144].

Antitumor Antibiotics Surprisingly, clinical information concerning the immunosuppressive effects of this class of anticancer drugs that includes such widely employed drugs as adriamy-

Robert K. Oldham cin (ADR), daunomycin (DNR), mitomycin (MTC), and bleomycin (BLEO) is limited. However, in animal models, these agents affect a variety of immune cells, in particular, macrophages and immunoregulatory cells [144, 340], suggesting that they should exert a spectrum of immunomodulatory effects in humans. On the other hand, ADR has been shown to augment both monocyteand lymphocyte-mediated cytotoxicity of human PBMC [20, 21, 282]. Following a single intravenous dose (25 mg/m2), PBL from cancer patients showed an increase in lymphocyte cytotoxicity as well as an increase in Tc/s levels [20]. In cancer patients, intravenously administered ADR has been shown to produce a rapid but reversible lymphocytopenia of both T and B cells [152]. In vitro, ADR has been shown to impair phagocytic function of human polymorphonuclear leukocytes [536], whereas similar effects were not seen with a variety of other drugs, including MT, VCR, 5-FU, and cisplatin. In addition, ADR has also been shown to inhibit granulocyte degranulation and release [95]. Some evidence has been provided that low doses of ADR can also augment both T- and B-cell mediated immune responses [144]. Thus, it now appears as if ADR, like CTX, can exhibit a variety of immunomodulatory activities.

Vinca Alkaloids and Podophyllotoxins The vinca alkaloids, vincristine (VCR) and vinblastine (VLB), possess a unique mechanism of antitumor activity involving drug-induced microtubular dysfunction leading to mitotic arrest. VCR has been shown to depress granulocyte aggregation, lysozyme release, and chemotaxis [95, 492]. However, there remains a substantial lack of studies concerning the immunomodulatory effects of these agents in humans. They are often administered in conjunction with steroids as treatment for hematopoietic cancers, making it impossible to define their selective immunosuppressive effects. Not unexpectedly, they inhibit human LPR in vitro, and they should exert similar effects in vivo. Both VCR and VLB have not been particularly immunosuppressive in humans [208]. Vindesine, a new semisynthetic vinca alkaloid, was devoid of immunosuppressive activity in preliminary clinical trials [425]. Podophyllotoxins such as VP-16 have mild immunosuppressive effect, similar to the vincas.

Other Drugs Other frequently employed anticancer drugs, such as cisplatin, nitrosoureas (BCNU, CCNU) and taxol also

113 exhibit varying degrees of immunomodulatory activity when incubated in vitro with human PBMC [492], but clinical data are sparse. Single intravenous doses of cisplatin have been associated with a rapid depression of LPR, with recovery in 1–2 days, whereas a single dose of CCNU leads to depressed PHA responsiveness for up to 6 weeks, in the absence of changes in T- and B-cell proportions. Long-term therapy with CCNU has been associated with cumulative depressions of absolute levels of both and T cells [52]. The reduction of T-lymphocyte levels was due mainly to a depletion of Tind cells. Taxanes have moderate immunosuppressive effects.

Hormones Hormonal agents such as tamoxifen (TAM) and medroxyprogesterone acetate (MPA) are used widely in the treatment of breast cancer. Both estrogen and progesterone receptors have been identified in human lymphocytes [117, 126]. There is considerable experimental and clinical evidence suggesting that hormones can modulate immune mechanisms [114, 371, 381]. Longterm treatment of patients with TAM has not produced significant immunosuppression [254, 451], whereas MPA depressed LRP as well as the Tind Tc/s ratio of treated patients (451).

Combination Chemotherapy When multiple cancer chemotherapy drugs are administered together, it is impossible to predict what effects their interactions will have on their individual immunosuppressive properties. Nevertheless, at the present time, most cancer chemotherapy regimens include a combination of drugs. A number of recent studies have begun to define the immunological consequences of combination chemotherapy as currently used for the treatment of patients with advanced disease, as well as for patients treated in the adjuvant setting. A comparison of intravenous doses of single drugs, namely ADR and 5-FU, with combinations such as COBAM (CTX, VCR, BLEO, ADR, MTX) or DOMF (DTIC, VCR, methyl-CCNU, 5-FU × 5) revealed that both the single agent and multiagent regimens produced a rapid drop (within several days) in the percentage and absolute numbers of circulating B and T cells, which was more pronounced for the combined drug regimens [152]. Such decreases were transient, and either a partial or complete recovery (with or without rebound) to baseline levels was then observed over the 1 or 2 weeks after drug administration [152]. Similar acute effects of multiagent chemotherapy regimens have been noted with respect to

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functional immune parameters such as in vitro LPRs [87], B-cell activation [232], reticuloendothelial cell function [151], and cytotoxic cell (NK) activity [83, 442]. In general, there has not been a good correlation between the depressions in immune cell numbers and functions. Cyclic combination chemotherapy can result in cumulative immunosuppressive sequelae [315, 396, 501]. Three similar studies have all involved patients receiving cyclic adjuvant chemotherapy for breast cancer who did not exhibit evidence of immune suppression before treatment. Serial immune assessments revealed that cyclic chemotherapy was associated with a marked initial (within 1 month) decrease in T- and B-lymphocyte numbers, and then gradual progressive further decreases [501], the same being observed in Tind Tc/s ratios [396]. There was also a rapid initial decrease in functional immune parameters, such as in vitro LPRs to antigens, with stabilization or some improvement over the ensuing year of treatment. In general, the functional immunological parameters tended to normalize during or, more often, within several months of stopping chemotherapy, whereas the abnormalities of immune cell numbers were still apparent 1 year after cessation of treatment [315]. Thus, it appears that prolonged administration of cyclic combination chemotherapy results in cumulative impairments of immune cell numbers and functions, some of which are long-lasting [439, 501]. In none of these studies were investigators able to predicate relapses in individual patients based on immune parameters. Recent attempts to manipulate the immune system have involved the combination of total body irradiation with aggressive, but non-ablative, chemotherapy. Such therapeutic studies are being done to deplete regulatory cells that negatively influence T-cell function followed by the reinfusion of T-lymphocytes derived from the patient’s own tumor, so-called tumor-infiltrating lymphocytes (TIL). These studies, which will be described in more detail elsewhere in this book, are producing clinical responses in 50% or more of patients with advanced melanoma [573]. Such aggressive approaches indicate that the immune system can be manipulated with chemotherapy and radiation therapy, but the future will probably in the area of more selective immune depletion with monocloncal antibody of the targets agents imparting less general toxicity.

Immune Status of Patients in Clinical Remission A number of studies have evaluated the immune status of patients in remission following the successful treatment of their cancer. In general, there tends to be

improvement and/or normalization of immune cell numbers and function for patients who achieve clinical remission following chemotherapy or radiation therapy. Nevertheless, some immunologic impairment persist for years after completion of successful treatment. Thus, in many cases, it may be extremely difficult to dissociate the chronic immunologic consequences of therapy from the presence of persistent immune defects while in clinical remission.

Solid Tumors Patients surgically cured of their cancers generally have a restoration of immune cell numbers and function after the perioperative periods [260, 437, 483]. Although patients in clinical remission following potentially curative radiation therapy may have some normalization of immunity, it does not usually become apparent until years after the completion of treatment [375]. Finally, as discussed previously, it has also become apparent that adjuvant chemotherapy for breast cancer results in cumulative depressions of both lymphocyte numbers and functions [315, 396, 501].

Hematopoietic Malignancies Much important information concerning the long-term effects of chemotherapy and radiation therapy in cured patients has resulted from studies of children who received maintenance chemotherapy for acute lymphoblastic leukemia and of adult patients with HD. In acute lymphoblastic leukemia patients who remained in clinical remission for 1–3 years after completion of chemotherapy, immune competence was found to recover. Those patients destined to relapse showed a subsequent deterioration in immune status, which was detectable some months before clinical relapse [178, 210, 211, 212, 214, 472]. The immune status of patients with HD in long-term clinical remission after treatment with chemotherapy or radiation therapy has also been evaluated in detail. At the completion of radiotherapy, DNCB reactivity was lost in almost all patients who were initially sensitive. However, many patients regained their DTHS responses during the first year after discontinuation of chemotherapy [7, 427] or radiotherapy [165, 428]. NK-cell activity also improved following successful therapy for HD. [161]. Several studies have shown that, following the completion of successful MOPP chemotherapy, patients in remission from HD exhibited gradual improvements of in vitro T-cell functions [7, 427]. In contrast, other studies have revealed a persistent depression of LPRs at 1–10 years after the completion

Robert K. Oldham of treatment, with no evidence for recovery [56, 57, 100, 154, 189, 428], along with a preferential chronic depletion of Tind cells [29, 185, 404, 427, 432]. In some of these studies, patients had received radiation therapy, which was felt possibly to contribute to the prolonged immune deficiency [165, 185, 404, 432]. Several authors have argued, however, that patients with HD in prolonged clinical remission continue to manifest immune abnormalities as a reflection of their underlying disease [56, 57, 100, 154, 291]. For example, persistent defects in T-cell functions were more severe in irradiated patients with HD than in similarly treated patients with testicular cancer [47, 432]. Although some improvements were noted on serial immune assessments following discontinuation of treatment, there have been no correlations between the status of immunity during clinical remission and likelihood of relapse [427, 428]. It has been suggested that an increased sensitivity of T-cells to the inhibitory effects of suppressor cells may account for the persistent depressions of T-cell functions in cured HD patients [535].

Treatment of Cancer-associated Immunodeficiency The term immunotherapy was introduced to clinical oncology 2 decades ago following the independent observations that Bacillus Calmette-Guerin (BCG) administration could prolong the survival of patients with acute lymphoblastic leukemia [326] and induce regressions of injected as well as noninjected malignant melanoma lesions [357]. Since these reports, a wide variety of chemicals and biologicals have been administered to immunosuppressed cancer patients in the hope of reconstituting or boosting host immune mechanisms (Table 1). A broader term, biotherapy, is now being used since there are many biological substances that stimulate cells outside of those from the immune system. These stimulations with colony stimulating factors, growth and maturation factors may have secondary effects on cancer and immune function.

Immunorestorative Agents Chemicals Levamisole, an orally active synthetic phenylimidazole, 2,3,5,6-tetrahydro-6-phenyl-imidazol[2, 1-6]thiazole, is the levo isomer of tetramisole, a potent, broad-spectrum antihelminthic agent introduced in 1966 [517]. The demonstration in mice that tetramisole could augment

115 Table 1. Biological response modifiers with immunorestorative properties Chemicals Azimexone Cimetidine Copovithane Coumarin DTC Ibuprofen Indomethacin Interferon inducers Isoprinosine Levamisole NPT 15392 Oxyphenbutazone Piroxicam Ranitidine

Biologicals Bestatin CSFs FK-565 IMreg-1 ImuVert Interleukin 1-–32 Interferon gamma Lentinan OK-432 Retinoids T-Cell reconstituting factor (SR 270258) Thymic factors Transfer factor Tuftsin

the protective effect of a Brucella vaccine [423] led to widespread clinical investigation of the immunomodulatory activity of both tetramisole and levamisole. In various animal models, and also following in vitro incubation with effector cells from human donors, levamisole has been found to increase both T-cell numbers and functions (e.d., LPR), if initially depressed [424, 574], as well as phagocytic and chemotactic activities of polymorphonuclear leukocytes and monocytes [111]. Its immunorestorative mechanism of action is currently unknown [220]. It has been shown to induce thymic factor-like activity, which has been attributed to the presence of a sulfur atom in its structure [186]. Levamisole, which contains an imidazole ring, may function like imidazole in affecting enzymes that control cyclic nucleotide levels in lymphoid precursors of lymphocytes. Both imidazole and levamisole, which themselves are not mitogenic, elevate cyclic GMP levels in lymphocytes in vitro and enhance their proliferative responses to mitogens or foreign antigens [111]. Only a limited number of dose- and schedule-seeking trials for cancer patients were performed with levamisole. In general, it has been administered intermittently, using two or three daily doses every 1–2 weeks [9]. The drug is well absorbed, and a single oral dose of 150 mg produces a peak plasma level in 2 h (0.49 + 0.05 μg/ml), which is the concentration required for in vitro activity. The plasma half-life of levamisole is 4 h. It is widely distributed and can be detected in all tissues and fluids, with the highest levels in liver and kidneys. It is excreted primarily in the urine, most of it by 24 h, although much of the excreted product has already undergone extensive metabolic changes.

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A number of side effects of levamisole have been reported [411, 414, 415, 431, 503, 568]. In studies on 3,900 patients with a variety of diseases (including rheumatic and inflammatory diseases and cancer), reactions included idiosyncratic or allergic ones, such as a rash or febrile influenza-like illness, sensorineural reactions such as alterations of taste and smell, and gastrointestinal symptoms. Rashes and fever resulted in the cessation of levamisole treatment in 7% and 1.5% of cases, respectively, but were quickly reversible. The major serious side effects have been agranulocytosis and/or neutropenia and, less commonly, thrombocytopenia, which have been observed in between 0.2% and 2% of all treated patients. Agranulocytosis could not be related to dose or schedule of administration, and was always spontaneously reversible following discontinuation of treatment [9]. The incidence of side effects in various clinical trials has varied from insignificant to major, requiring interruption of therapy in up to 21% of cases [385]. Levamisole was approved for the adjuvant treatment of stage III colon cancer as an immunomodulator to be used with adjuvant chemotherapy. It enjoyed some use for several years in this setting, but is no longer used because of improved regimens for the adjuvant treatment of stage III colon cancer. Isoprinosine (IPS), a synthetic antiviral agent, is a complex of inosine and the p-acetamidobenzoate (PacBA) salt of N,N-dimethylamino-1-propanol (DIP) is a 1:3 molar ratio [111, 186]. In early clinical trials with rhinovirus-infected humans, IPS increased the titers of circulating antiviral antibody, suggesting it had B-cell immunomodulatory activity [489]. Subsequent in vivo studies in animal models and in vitro studies with human PBMC have indicated that IPS enhances T-cell functions such as LPR to mitogens and alloantigens [111, 186, 356]. Helper T cells appear to be the main target for the drug in humans. IPS has also been shown to induce the appearance of T-cell surface markers in mouse prothymocytes, similar to that of thymic factors, as well as increase the proportions of various T-cell subpopulations following incubation with human PBMC. In vitro, IPS at a concentration of 100 μg/ml restored LPRs, NK activity, and monocyte chemotaxis of PBMC isolated from cancer patients [526]. Because the immunomodulatory activity of IPS is similar to that of a variety of thymic factors, it has been classified as a thymomimetic drug. Although IPS has been investigated clinically in several different viral diseases (including human immunodeficiency virus [HIV] infections), only a limited number of studies have been performed with cancer patients [111,

517]. Extensive tolerance and safety studies have been conducted in which IPS was administered orally for periods of 1 week to 2 years at doses of 1–8 g/day. Minimal side effects have been noted, including transient rises in serum and urine uric acid levels and, occasionally, transient nausea associated with higher daily dosages. Following oral or intravenous administration to rhesus monkeys, the inosine moiety of IPS is rapidly metabolized, with a half-life of less than 4 h. Azimexone (BM 12.531) is an orally active aziridine dye, 2-[2-cyanaziridinyl-(1)-2-[2-carbamoylaziridinyl(1)]-propane, which has been found to increase the number of cytotoxic autoreactive cells. It exhibits antitumor activity in animal models [53, 111, 186] and exerts a variety of immunomodulatory effects on T cells, monocytes, phagocytic cells, and NK cells. Azimexone has exhibited immunorestorative activity in various animal models of infectious diseases. In vitro studies using PBL from advanced cancer patients revealed that azimexone at various concentrations (0.2–10 μg/ml) enhanced the LPR to PHA with a maximal effect at 0.2 μg/ml. Other studies have indicated that azimexone also enhances the percentage of activated T lymphocytes in vitro. In a limited number of clinical studies, the only significant side effect observed with intravenous administration has been a dose-dependent self-limiting hemolysis [358]. Oral absorption of azimexone is almost complete, and the serum half-life is 6 h.

Histamine Receptor Antagonists Cimetidine is a histamine type II receptor antagonist widely used for the treatment of gastrointestinal ulcers. A growing body of evidence has suggested that suppressor T cells that possess histamine receptors (H2 type) may play an important immunoregulatory role in normal immunologic responses [88, 149, 377]. The rationale for administering H2 blockers to cancer patients is based on the observation that cimetidine could abrogate in vitro histamine-induced suppressor T-cell activity using human PBL. Results of in vitro preclinical testing with cimetidine have been summarized [329]. It has been shown to augment LPRs and IL-2 production of PBMC from cancer patients to mitogens and alloantigens [148, 289, 513]. In vitro cimetidine also enhances NK-cell activity of PBMC from cancer patients, probably through its inhibitory effects on suppressor cells [156]. No effects have been seen on transformation of peripheral blood monocytes to macrophages [169]. Cimetidine was employed in a phase I/II study [323] and in combination with coumarin [322, 518, 519]. Varying degrees of antitumor activity have been noted

Robert K. Oldham in patients with malignant melanoma [518, 519] and renal cancer [322] treated with the combination of cimetidine plus coumarin. The mechanism of antitumor activity has not been established but the doses used are approximately 2x that for treatment of ulcers. Histamine has been shown to suppress human LPR to mitogens, and cimetidine might block the inhibition. More recently, histamine was used in clinical trials as a drug to assist IL-2 induced T cell function with some evidence of useful clinical effects in melanoma metastases to the liver. The clinical effects were marginal.

Nonsteroidal Anti-inflammatory and Antipyretic Agents (NSAID) Indomethacin and ibuprofen are prototype inhibitors of prostaglandin synthesis. A large number of in vitro studies using PBMC from patients with solid tumors and HD have suggested that (a) the depressed LPRs of cancer patients result, at least in part, from the immunosuppressive effects of prostaglandins released by activated monocytes/macrophages, and (b) indomethacin is capable of abrogating the suppressor cell influence. In addition, it has been shown in vitro that indomethacin also acts directly on T cells of patients with malignant melanoma to augment mitogen responsiveness [520]. It has been postulated that this direct immunomodulatory action results from specific pharmacologic effects such as alteration of intracellular cyclic AMP levels. Finally, a correlation has been observed between tumor spread and content of prostaglandin E2 of the tumor [42]. These observations have formed the basis for administering prostaglandin inhibitors to cancer patients [96, 405, 563].

NPT 15392 Studies with IPS suggested that the inosine moiety might be responsible for its immunomodulatory activity on LPRs. Subsequently, a number of purines with inosine-like structures were synthesized, one of which is NPT 15392 (9-erythro-2-hydroxy-3-nonylhypoxanthine) [157, 186, 578]. In animals, NPT 15392 has exhibited effects on T-cell and monocyte/macrophage functions and T-cell differentiation similar to those of the parent compound [157]. Toxicological studies have shown that it is nontoxic at oral doses up to 35 mg/day. This drug has been tested in clinical trials in cancer patients [575]. DTC, sodium diethyldithiocarbamate (Immunothiol), was developed as a result of preliminary studies with levamisole in an attempt to synthesize a chemically defined sulfur-containing compound that would be la more potent immunorestorative agent than the parent

117 compound [186, 422]. DTC is a chelating agent in use for the treatment of heavy-metal poisoning. In animal models, it exhibits a variety of immune-augmenting effects on T-cell dependent immune responses as well as on the induction of T-cell differentiation. No significant toxicity has been noted following long-term administration. Clinical trials in cancer patients and in patients with HIV disease have not been promising. Coumarin (1,2 benzopyrone) has been reported to exhibit immunomodulatory activity [49, 581]. Unlike warfarin, coumarin is devoid of anticoagulant activity. In cancer patients, coumarin administration was reported to enhance LPRs to PHA but did not effect T-cell numbers [49]. In vitro coumarin has augmented HLA DR expression and NK activity [581]. It has been administered in combination with cimetidine to patients with malignant melanoma [518, 519] and renal cancer [322] with varying degrees of antitumor activity reported. The mechanism of antitumor activity of the combination has not been established. Copovithane (BAYi7433) is a copolymer of 1,3-bis (methyl amino carboxy)-2 methylene propane carbamate, has exhibited antitumor activity in a variety of pre-clinical models [458]. A phase I trial in advanced cancer patients using weekly intravenous dosing revealed minimal fatigue, and occasional nausea and proteinuria, as the only side effects, some antitumor effects, and some improvements in Tind/Tc/s and in vitro toxicity responses and LPRs [233].

Biologicals Thymic Factors A functioning thymus gland is an essential requirement for the normal development and maintenance of cell-mediated immunity [73]. The thymus is responsible for the normal maturation of all the various subclasses of T-lymphocytes, including various effector cells, as well as immunoregulatory cells. The thymus exerts its influence during the ontogenesis of the immune system of releasing, in situ from its epithelial stroma, a variety of differentiating factors that induce the maturation of resident pre-T stem cells (thymocytes) into mature T cells, which ultimately circulate in the peripheral blood and lymph. It is now well established that the thymus gland is an endocrine organ and that at least several of its locally released differentiating factors are also secreted into the bloodstream. Thymic hormone-like bioactivity has been demonstrated in the blood of animals and humans. This activity decreases following thymectomy, as well as with age, in parallel to the physiological agedependent involution of the thymus. The presence of the

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thymus is important well into adulthood in order to maintain immune T-cell mechanisms. A number of factors with thymic hormone-like activity have been prepared from thymus tissue and blood, and these are in varying stages of characterization [173, 372, 463, 478, 485]. The best studied are thymosin fraction 5 (TF5), thymosin α1 (Tα1), prothymosin α (Pro Tα), thymostimulin (TP-1), thymulin (FTS-Zn), thymopoietin (TP), thymic humoral factor (THF), and thymic factor x (TFX). These agents all exhibit a broad spectrum of immunorestorative effects on T-cell numbers and functions in animal models and humans. In some bioassays, many of the well-characterized thymic preparations have identical, or even opposite, effects. An increasing number of thymic factors have been employed therapeutically in treating a variety of diseases – predominantly cancer and HIV disease [134]. The well-characterized thymic preparations are listed in Table 2 [173, 192, 463]. Among the thymic factors that have been administered to cancer patients are TF5, Tα1, TP-1, THF, and TFX. Both TF5 and TP-1 are partially purified extracts of calf thymus glands. They include a mixture of different biologically active as well as inactive polypeptides. The purification procedures for TF5 and TP-1 are similar but not identical. TF5 consists of ten major – and at least 30 minor – polypeptides on analytical isoelectric gel focusing with molecular weights ranging from 1,000 to 15,000. The first biologically active polypeptide isolated from TF5 is Tα1. Biologically active Tα1 has a molecular mass of 3,108 daltons. It has been synthesized by classical chemical,

Table 2. Chemical properties of thymic hormones Name

Chemical properties

Thymosin fraction 5 (TF5) Heat-stable, acidic Peptides MW 1,000–15,000 Thymosin α1 (Tα1) Peptide of 28 residues, MW 3108 Prothymosin α (Proα) 113 Amino acids, MW 13,500 Acidid peptide, MW 2000, pl 3.5 Thymosin α9 Thymosin α11 (T α11) Peptide of 35 residues, 28 residues identical To Tα1 Thymosin β3 (T β3) Peptide of 49 residues, MW 5700, 43 residues Identical to Tβ4 Thymosin β4 (Tβ4) Peptide of 43 residues, MW 4963 Thymic factor X (TFX) Mixture of peptides; active compound is a peptide, MW 4200 Thymostimulin (TS/TP-1) Mixture of peptides Thymulin (FTS-Zn) Nonapeptide, MW 857, Thymic humoral factor Peptide MW 3200 (THF) Thymopoietin (TP) Peptide of 49 residues, MW 5562

solid-phase, and recombinant DNA techniques, but only the chemically synthesized material has been employed in clinical trials. Thymopoietin, THF, and TFX are purified thymic peptides with molecular weights ranging from 3,220 to 5,562. TP-5 is a biologically active synthetic pentapeptide that represents amino acids 32–36 of thymopoietin. In contrast to all other thymic preparations, thymulin (FTS-Zn) has usually been isolated from pig blood rather than thymus tissue. Although thymulin, Tα1, and thymopoietin are all detectable in the blood, only thymulin levels drop significantly following thymectomy, and are restored by thymic grafts. None of the well-characterized thymic peptides exhibit any significant homology with the other characterized peptides. However, a 50% homology has recently been identified between a 35 amino acid region of Tα1 and that of the p17 core protein of the AIDS retrovirus (HIV) [449]. Thymic factors, which have been administered to more than 1,000 cancer patients, have shown minimal toxicity, but some have been approved for general clinical use. The purified preparations that have been administered by intramuscular or subcutaneous injection have not produced any significant side effects [173, 463]. Partially purified bovine preparations, such as TF5, have produced rare (less than 1%) allergic reactions and erythema and/or pain at the sites of injection in about one third of treated patients. However, potentially immunizing treatment schedules, such as daily injections for 1 week followed by 3 weeks of rest, and reinstitution of treatment, have been associated with a high (10%) incidence of anaphylactoid-like reactions. As a single agent, TF5 has exhibited minimal antitumor activity in patients with renal cancer in one study [465] and none in another [135]. More recently, thymic factors have been used less due to the availability of specific lymphokines with more powerful activities.

T-cell Reconstituting Factor This is a highly purified protein fraction isolated from human serum that has been shown to exhibit immunomodulatory effects on T-cell numbers and functions [364]. In preliminary phase I/II trials, no unexpected toxicities have been observed following SQ administration. TsIF is a thymic isolate, distinct from other thymic factors and cytokines, that induces immature bone marrow cells to differentiate into competent suppressor T cells. It has a molecular mass of 75,000 daltons as determined by gel filtration and high-performance liquid chromatography. Recent studies in mice indicated that TsIF administration suppresses the development of autoimmune disease in lupus-rheumatoid arthritis-prone animals [341].

Robert K. Oldham

Transfer Factor In 1955 it was demonstrated in humans that the transfer of DTHS to streptoccal M substance and tuberculin could be accomplished by administration of a suspension of leukocytes disrupted by either distilled water or repeated freeze-thaw cycles [294]. The substance (or substances) responsible for this transfer was resistant to RNAase and DNAase and was termed transfer factor. This initial work was extended using dialyzable human leukocyte extracts from patients sensitized to various antigens [25], including skin allograft antigens [493]. The crude dialyzable preparation has subsequently been shown to enhance LPRs in vitro [24, 142]. The further chemical characterization of transfer factor has been hampered by the lack of a unique biological assay to monitor final purification. Preliminary fractionation studies of human leukocyte extracts capable of transferring DTHS responses have indicated that transfer factor is probably a low-molecularweight material (approximately 1,000) with the electrophoretic mobility of slow γ-globulin but with no reactivity to anti-immunoglobulin antisera. Its possible composition, that is, a short polypeptide chain joined with a threeor four-base segment of RNA, has been difficult to verify. Unlike other nonspecific immunorestorative BRMs, transfer factor appears to exert antigen-specific immunerestorative effects. Despite the lack of readily reproducible in vitro or in vivo assays, the effects of transfer factor have been studied following subcutaneous administration to patients with a variety of immunodeficiency diseases, including cancer [354].

Interleukins Many of the BRMs currently being synthesized by recombinant DNA techniques are products of lymphocytes (lymphokines), monocytes (monokines), or other cells (cytokines). Various interferons and interleukins have been purified to homogeneity produced by genetic engineering to make large quantities available for clinical trials. Various other cytokines are undergoing active clinical investigation [187]. The characteristics and results of clinical trials with these materials are discussed in Chapter 8.

Retinoids Considerable interest has recently been focused on the influence of vitamin A (retinol) and its natural and synthetic derivatives (Aretinoids) on the growth and differentiation of neoplastic cells. Although retinoids have been administered to cancer patients primarily as chemopreventive agents [74, 308], accumulated evidence also indicates that they have beneficial effects on the host immune system. For example, in animals they

119 have been shown to restore PHA responsiveness, to induce augmentation of cytotoxic and helper T-cell numbers and functions, and to inhibit prostaglandin synthesis by host tumor-activated macrophages. However, the role that altered immune mechanisms play in the chemopreventative action of retinoids, such as 13-cis-retinoic acid, remains unclear (see Chapter 16). FK-565 [heptanoyl-8-D-Glu-(L)meso-α1-A2pm(L) AlaOH] is a heptanoyl tripeptide analogue of FK-156, a biologically active acylpeptide isolated from fermentation products of Streptomyces. Preclinical studies in mice have shown that FK-565 augments NK-cell activity and macrophage functions as well as T-cell functions both in vitro and in vivo [507]. However, in animals, mitogeninduced IL-2 production is decreased [4]. Clinical trials in cancer patients have not been promising. Bestatin [(2S,3R)-3-amino-2-hydroxy-4-phenylbutanoylL-leucine] is a low-molecular-weight immunomodifier found in supernatants of Streptomyces olivoreticuli [327]. It is a competitive inhibitor for the enzymes aminopeptidase B and leucine aminopeptidase. These enzymes are associated with the outer membranes of most mammalian cells, including lymphocytes. In animal models, bestatin augmented both humoral as well as cell-mediated immune responses [60, 69], particularly in immunosuppressed mice. Macrophage activation, but not NK activity, was also observed both in vitro and in vivo [506]. It has also been shown to enhance T-cell numbers and cytotoxic functions following in vitro incubation with human lymphocytes, but it has not significantly influenced LPR [69]. It has been shown to augment phagocytic cell function in vitro. Bestatin has now been chemically synthesized and is in clinical trials. The drug has been well tolerated in cancer patients at daily doses of 30 mg for up to 2 years [60, 69, 369, 576], but has shown little clinical activity. Tuftsin is a naturally occurring tetrapeptide (Thr-LysPro-Arg), found normally in human and animal plasma, and represents residues 289–292 of the heavy chain of γ-globulin [121, 157, 365, 395]. It is released enzymatically from a protein carrier (Leukokinin) and is capable of activating various functions (particularly phagocytosis) of polymorphonuclear leukocytes and monocytes/ macrophages, T-cell cytolytic activity, and IL-2 production at physiologic concentrations [125, 327]. It has also been shown to enhance antibody production to thymicdependent as well as thymic-independent antigens in animals and Ia-suppression. It has also been able to reduce tumor necrosis factor in animals [571]. Lentinan is a purified polysaccharide obtained from the extracts of the edible mushroom Lentinus edodes

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[66, 110, 243, 373]. Chemically, lentinan is a β-(1,3)glucan with some β-(1,6)-glucoside side chains. It has a molecular weight of about 500,000. Evidence has been presented that lentinan is a T-cell adjuvant, but a variety of immunomodulatory activities have been observed [109, 327]. In animal models, it has been shown to augment antibody production only in the presence of T cells. It has also been shown to augment a variety of cytotoxic effector-cell mechanisms following administration to animals and to trigger production of various kinds of serum factors including IL-1, CSF, and IL-3 [109]. In vitro, it activates monocytes/macrophages and NK-cell activity of PBMC from cancer patients but does not enhance LPR or LAK-like cytotoxicity [263]. OK-432 is a heat-killed substrain of Streptococcus pyogenes that has been studied extensively in Japan. OK-432 predominantly acts by augmenting NK-cell activity [378, 539, 545], as well as augmenting macrophage [269] and T-cell [223] cytotoxicity. It has also been shown to induce various cytokines such as interferon, IL-1, and IL-2 [242, 368, 443]. A variety of Japanese phase I, II, and III studies have been performed in cancer patients in which it has been administered intradermally [106, 115, 339, 545], intramuscularly or intralesionally [539]. The major toxicities have been fevers and local inflammatory reactions at injection sites. ImuVert is prepared from the bacterium Serratia marcesseus. Its primary components are vescicles derived from the bacterial membrane and ribosomes [554]. It augments natural killer-cell activity and has antitumor cell activity in animals. It has demonstrated poor activity in clinical trials in patients with malignant gliomas and other cancers. Imreg-1 is a natural, leukocyte-derived immunomodulator containing two low-molecular-weight peptides: a dipeptide (tyrosine-glycine) and a tripeptide (tyrosineglycine-glycine). In vitro Imreg-1 enhances the production of various cytokines, including IL-2 [176]. Clinical trials to date have been limited to patients with HIV disease and have not shown much promise.

Treatment of Cancer-associated Immunosuppression: Phase I and II Studies Most of the agents described in the preceding section have already been employed therapeutically in patients with cancer. Of the chemical BRMs, levamisole has been by far the most exhaustively studied, whereas among the biologicals, the interleukins have received the most attention. No organized approach has been employed for the clinical evaluation of the immunorestorative BRMs. In general, a small phase I or phase

II study to assess the tolerability and immunomodulatory effects of the agent in advanced cancer patients has been followed by phase III trials with random experimental designs in which survival was the end point and immunological monitoring was minimal, or even omitted. Thus, it has been difficult to make any firm conclusions concerning the immunorestorative properties of these agents in cancer patients. A number of preliminary small-scale phase I and II studies have indicated that levamisole [111, 302, 349, 366, 558], isoprinosine [111, 356, 403], azimexone [53, 388], bestatin [69, 288, 328, 369, 560, 576], OK-432 [530, 545], retinoids [337], NPT 15392 [575], DTC [422], coumarin [49], various thymic factors [173, 463], lentinan [245], cimetidine [289, 329, 426, 488], and transfer factor [493] could improve T-cell, NK-cell, or B-cell numbers and/or functions in advanced cancer patients with pretreatment abnormalities. In general, however, the effects have not been striking. When administered to patients without immunodeficiencies, however, therapy was often followed by a deterioration of immune competence. In several reports, no immunomodulatory effects of levamisole were observed on T-cell numbers or functions [200, 558]. A study of patients with colorectal cancer suggests that the major in vivo effect of levamisole is augmentation of monocyte chemotaxis [179]. Of the thymic factors, THF and TFX have been employed predominantly in patients with infectious complications, and reports have been mostly anecdotal. Cimetidine has increased an in vivo local graft-versus-host reaction of advanced cancer patients [508]. However, in other studies, it had no effects on immune cell numbers or functions, or on DTH [316]. Similarly indomethacin has been of only limited utility in restoring immunity in advanced cancer patients [219]. The administration of cimetidine or ranitidine to advanced cancer patients has been associated with improvements in performance status [92]. In one study, treatment with the combination of coumarin plus cimetidine increased the percentage of monocytes and of DR+ monocytes of treated patients [323].

Chemicals Hodgkin’s Disease HD was chosen because of the well-documented abnormalities of T-cell immunity that are present prior to treatment and that persist in patients during clinical remission. Levamisole has been shown in vitro to enhance T-cell proportions [50, 451] among PBMC of HD patients. Treatment of patients with HD in remission for less than 2 years after the completion of radiotherapy resulted in

Robert K. Oldham improvement in T-cell percentages and functions [301]. DTH reactions and PHA responses also increased [50]. Continuation of treatment beyond 3 months led to a slight but consistent decline of these parameters.

Solid Tumors A pilot study was performed with levamisole in surgically resected patients with malignant melanoma and squamous-cell carcinoma of the head and neck [57]. Patients treated with levamisole (150 mg orally twice a week) for 6 months exhibited improvements in absolute circulating T-cell levels, and only one of eight melanoma patients treated with levamisole relapsed. Based on these results, large-scale phase III were designed, the results of which have been reported as negative in one and marginally positive in the others [412, 491]. Based on phase III data in resected colon cancer, levamisole was approved for use with 5-fluoruracil as adjuvant treatment of resected stage III colon cancer. However, more active regimens have recently been available, making levamisole little used in the current treatment of colon cancer.

Biologicals

121 negative prior to treatment. In a more recent report from the same group, 19 patients in remission for at least 6 months were randomized to receive TP-1 at 50 mg IM daily, every other day for 35 days, or no treatment [304]. Patients who received TP-1 were then maintained on TP-1 twice weekly. Before treatment, patients exhibited depressed percentages and absolute numbers of circulating T cells and Tind cells. Following 5 weeks of daily TP-1, the proportions and numbers of all T-cell subpopulations increased significantly, while alternateday treatment was not as effective. Maintenance TP-1 therapy did not produce any further improvements in T-cell or B-cell numbers or proportions. PBMC from some patients also exhibited improvements in mitogeninduced lymphokine production (e.g., IL-2, IFN-γ), but the improvements were not statistically significant overall. No significant changes were observed in a variety of serum markers including neopterin and β2-microglublin. It was concluded that TP-1 has the potential to expand the T-cell pool, and, in particular, Tind cells, in patients with HD in remission, but that intensive (daily) induction therapy is required. In this small sample, no conclusions could be established and large-scale clinical trials have not been done.

Hodgkin’s Disease

Malignant Melanoma

In one study, 19 consecutive untreated patients with HD received TP-1 at a dose of 1 mg/kg daily for 7 days, and immunological monitoring was performed prior to treatment and again on day 8 [324]. A majority of untreated patients exhibited depressed T-cell percentages as well as depressed DTHS and LPRs to PHA. The mean T-cell percentage increased significantly, from 47% to 55.7% (normal is 58.9%) following treatment with TP-1, whereas the mean PHA response improved but did not totally normalize. Similarly, DTH responses to recall antigens were positive in 53% of patients before therapy, and in 95% after therapy. The patients most likely to respond to TP-1 were the most lymphopenic, for whom an in vitro enhancing effect of TP-1 was observed on T-cell percentages and LPRs of PBMC prior to therapy. In a similar study, 15 patients with HD (in remission and off therapy for at least 1 year) were treated with 50 mg TP-1 by daily intramuscular injections for 60 consecutive days [303]. For patients with initially depressed T-cell numbers, including depressed helper (Tind) cell numbers, reconstitution to normal occurred within 30 days after the onset of therapy, but returned to pretreatment levels after the discontinuation of therapy. There was also a significant increase in NK activity, but in vivo DNCB reactivity did not become positive in any patient who had been

TP-1 has been studied in a novel random-design trial involving 32 patients with localized stage I malignant melanoma who were rendered disease-free following surgery [51]. Subjects were selected from a cohort of 211 postsurgical patients who were monitored at 3-month intervals in the first 2 years after surgery. In prior work, it was demonstrated that patients who developed low circulating T-cell levels were at high risk for relapse. Patients who either exhibited presurgical depressions of total T-cell numbers or on serial monitoring developed a depression of absolute circulating T cells to less than 1,000/mm3 were considered eligible for random assignment to one of three treatment arms: TP-1 alone (25 mg IM once a week, eight patients); chemotherapy alone (DTIC, 200 mg/m2 intravenously for 5 days, repeated monthly, eight patients); or no further therapy (16 patients). In the eight patients who received TP-1, T-cell numbers began increasing within 3 days after the first injection, and weekly immunological monitoring revealed that levels returned to normal and were maintained at that level. Only inconsistent effects on T-cell functions were seen in the group that received TP-1, and no changes were observed in any parameter in patients who were untreated or who received chemotherapy. Overall survival was better for the TP-1 group, but the improvement was not statistically significant.

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Chronic Lymphocytic Leukemia (CLL) Patients with Cll have also been treated with TP-1 [290]. TP-1 significantly increased Tind-cell proportions, leading to an improvement in the Tind/Tc/s ratio accompanied by an increase in LPRs to PHA and helper-cell function. In this study, the in vitro incubation of purified T-cells with TP-1 did not produce modifications of subset proportions or of immune functions. In contrast, in vitro incubation of T-cells with Tα1 from patients with stablephase CLL led to an increase in T-cell proportions and an improvement in T-cell functions [41].

Phase II/III Surgical Adjuvant Studies Chemicals Lung Cancer The vast majority of large-scale phase III surgical adjuvant studies have been performed with levamisole. Two randomized, double-blind trials in patients with nonsmall-cell lung cancer have been reported [10, 16]. In the first trial, a fixed dose of levamisole was administered preoperatively for 3 days, and then for 3 days every 2 weeks [10]. Treatment was continued for 2 years or until relapse. Among 211 patients, although there was no difference in overall survival, levamisole treatment was associated with a reduction in distant metastases and in cancer deaths. When analyzed on the basis of adequacy of drug dosage, it was found that the greatest benefit of levamisole was seen with patients who received a daily dose of 2.1 mg/kg or more. The second study was designed as a confirmatory trial, and a weight-related dose of levamisole was employed, with a schedule identical to that in the original study [16]. Nevertheless, among the 217 evaluable patients, overall survival was decreased in those who received levamisole, because of non-cancer-related deaths in the perioperative period.

Gastrointestinal Cancer In the early 1980s, results of several small-scale trials were reported that suggested that levamisole could prevent perioperative immune suppression. A British report in 1979 first indicated that the administration of levamisole on 3 postoperative days could accelerate the recovery of antitumor immunity (in an LMI assay) but not LPRs to PHA [570]. In a Japanese trial of 50 patients with colon cancer, 15 were treated with levamisole at a dose of 150 mg daily for 2 consecutive days, every other week, beginning 3 days before surgery. Treatment with levamisole appeared to prevent the postoperative depression of LPRs to PHA, as compared with a control group of

patients, but did not affect DNCB reactivity [477]. A Belgian colorectal trial used levamisole (150 mg for 3 days every 2 weeks) in a matched group of patients operated on by the same surgeon. In both the overall group and the 40 patients with Dukes B2 and C cancers, survival was prolonged with levamisole [538]. Improved survival of resected patients was reported in a broad trial of 177 patients with various gastrointestinal cancers treated with levamisole [347]. There was also improvement in DTHS reactions and in vivo LPRs. Similar results from the Japanese literature have been reported for patients with advanced gastric cancer treated with levamisole [348]. An interesting recent report of a randomized trial involving 181 resected patients with gastric cancer showed an increase in median survival for patients who received cimetidine [524].

Phase III Levamisole Trials in Colon Cancer Within the past decade, results of a series of phase III trial results have been reported, in which levamisole was administered alone, or in combination with adjuvant chemotherapy in patients with resected colorectal cancer [23, 32, 113, 244, 292, 293, 351, 474, 569]. A large-scale trial that was designed to compare treatment with levamisole to surgery only reported by the European Organization for Research and Treatment of Cancer (EORTC) Gastrointestinal Tract Cancer Cooperative Group [23]. This double-blind placebocontrolled trial involved 297 patients with Dukes C colon cancer. Levamisole dosage was based on body weight and ranged from 100 to 250 mg/day for 2 consecutive days each week for a period of 1 year. Treatment was started as soon as possible after surgery, usually within 2 weeks. With a median follow-up time of 3 years, no benefit was seen in disease-free survival for patients who received levamisole. Although the proportion of patients alive at 5 years was 51% in the levamisole group versus 39% in the placebo group, this difference was not statistically significant. Other large-scale trials convincingly demonstrated that postoperative adjuvant therapy with levamisole plus 5-FU impacts significantly on survival of patients with colon cancer [244, 292, 293, 351]. Thus, levamisole plus 5-FU was considered standard adjuvant treatment for resected Dukes C colon cancer until folinic acid plus 5-FU proved as effective, less expensive and easier to administer. Levamisole is currently not used in the treatment of colon cancer or any other human malignancy.

Gynecologic and Urologic Cancer Positive surgical adjuvant studies have been reported with levamisole in postoperative patients with cervical

Robert K. Oldham cancer [447] and bladder cancer [486] but is no longer being used.

Malignant Melanoma Only one study has focused on assessing in detail the immunorestorative effects of levamisole in patients with locally advanced malignant melanoma following surgical resection [253]. Levamisole was administered at 150 mg/twice weekly. No improvements were noted in T-cell numbers, or in LPRs to mitogens or antigens. A large-scale phase III trial with levamisole involved 203 postsurgical patients with malignant melanoma. No improvement in either relapse rates or overall survival was noted in patients who received levamisole [491]. In stage I patients, there was a trend in favor of levamisole regarding time-to-recurrence and survival. More recently, a large study involving 548 patients with completely resected malignant melanoma having a poor prognosis (Clark levels 3, 4, or 5, greater than 0.75 mm, satellite lesions, in-transit metastases, or regional lymph node metastases) revealed that patients treated postoperatively with levamisole (2.5 mg/kg orally on 2 consecutive days weekly for 3 years) survived significantly longer than those who received either no postoperative therapy or weekly BCG, or a combination of BCG alternating with levamisole [412]. Median follow-up time for this trial was 5.1 years. In a randomized trial involving 156 stage I Clark level 3, 4, and 5 patients, there was a trend for a delay in appearance of distant metastases in patients receiving levamisole (30 months versus 9 months for patients receiving placebo), but overall survival was not significantly improved [309].

Biologicals Lung Cancer Several studies have focused on the effects of transfer factor administered as an adjuvant to surgery. A tumor antigen-specific preparation, prepared from household contact family members with positive reactivity to lung cancer antigen, was administered to 28 resected patients with non-small-cell lung cancer twice by subcutaneous injection. Treatment was associated with a significant improvement in a variety of specific as well as nonspecific immune parameters, including DTH reactions and LPR to PHA [163]. In a randomized study of 63 postoperative patients with non-small-cell lung cancer (some of whom received mediastinal radiotherapy), those who received transfer factor from normal donors beginning 1 month after surgery and continuing every 3 months showed a significant improvement in survival at 2 years compared with nontreated patients [276].

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Head and Neck Cancer The impact of preoperative perilesional therapy with OK-432 was studied in 13 patients [539]. Treatment was associated with less pronounced decreases in NK activity of PBMC, and higher NK activity in draining lymph nodes, than in patients treated by surgery alone.

Malignant Melanoma TP-1, transfer factor [90], isoprinosine [403], and TF5 [463] have been administered to postoperative patients with malignant melanoma. Each of these trials involved random treatment assignments and varying degrees of immune monitoring. No adjuvant effects could be demonstrated in these small studies. The trial with TF5 was complicated by the fact that only 45 patients were allocated to treatment with either a low dose (4 mg/m2) or high dose (40 mg/m2) administered subcutaneously, concurrently with BCG, with or without DTIC chemotherapy. A large-scale, randomized, double-blind phase III trial that involved 168 resected patients with highrisk stage I and stage II malignant melanoma has been reported [342]. Therapy (normal donor transfer factor or placebo) was initiated within 90 days of resection and continued for 2 years. With a median follow-up period of 25 months, patients who received placebo exhibited a trend for improved disease-free survival and overall survival. Thus, this large-scale trial has indicated that normal donor transfer factor is not an effective postsurgical adjuvant therapy for malignant melanoma.

Treatment of Radiotherapy-induced Immunosuppression Although a number of clinical trials using immunorestorative BRMs in irradiated patients have been reported, little information is available concerning whether or not treatment can prevent and/or reverse radiotherapy-induced immunosuppression.

Chemicals Levamisole Of the putative chemical immunorestorative agents, levamisole has been most extensively evaluated as an adjunct to radiation therapy. Since the larger trials have focused almost exclusively on survival as an end point, very little information has been obtained concerning its immunorestorative properties. Several of the smaller trials have included serial immune monitoring. In a study involving 57 patients with colorectal cancer treated with surgery and radiation therapy, levamisole at a dose of 150 mg/day for

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2 consecutive days every other week, beginning concurrently with postoperative radiation therapy, enhanced LPRs to PHA as compared with an untreated control group [293]; no effects were observed on DNCB reactivities. In a randomized double-blind study involving 71 postoperative patients with stage II breast cancer, 38% of those who received levamisole (2.5 mg/kg/day on 2 consecutive days, twice weekly, beginning with the initiation of radiation therapy) exhibited improvement in DTHS to at least three recall antigens, as compared with only 19% of those given a placebo [277]. Similar results were noted in an earlier trial using DNCB reactivity [473]. Thus, such studies suggested that levamisole may improve some aspects of T-cell functions in irradiated patients. A number of large-scale cooperative group trials have now demonstrated that levamisole administration does not improve the survival of patients treated with radiotherapy. Four separate negative trials have been reported involving patients with non-small-cell lung cancer (NSCLC). The Southeastern Cancer Study Group reported that levamisole was without significant clinical benefit in a large randomized, placebo-controlled trial of 251 patients undergoing radiotherapy for inoperable non-small-cell lung cancer [285]. In this study, levamisole was administered at a dose of 2.4 mg/kg twice weekly beginning at the initiation of radiotherapy. The median survival of patients treated with levamisole was shorter than that of those who received placebo. Negative results have also been reported in a SWOG similar trial [566]. The Radiation Therapy Oncology Group (RTOG) reported results of two separate randomized, placebocontrolled trials, one involving 74 patients with resected NSCLC and positive lymph nodes [215], and a second involving 285 patients with unresectable tumors [395]. Levamisole (2.5 mg/kg on days 1 and 2, weekly) or placebo was initiated at the beginning of radiation therapy and continued for up to 2 years. Accrual to the first trial was terminated prematurely when survival data became available from the second study indicating a worse survival (9 months versus 12 months). Thus, it appears to be conclusively established that levamisole combined with radiation therapy has no benefit in the treatment of NSCLC [400]. In the randomized trial involving 71 stage II breast cancer patients treated with radiotherapy postoperatively, those who received levamisole exhibited a slight prolongation of disease-free survival [277]. Among postmenopausal patients, levamisole significantly increased both disease-free and overall survival, and the levamisole group showed fewer distant metastases as the first sign of recurrence. In another trial involving 150 patients ran-

domized to postoperative radiotherapy, chemotherapy, or both with or without levamisole, patients receiving radiotherapy plus levamisole exhibited improved diseasefree and overall survival [278, 280]. These results are in contrast to two other similar studies. In a randomized but not double-blind study, levamisole treatment was associated with an increased recurrence rate [127]. In a trial involving 198 patients with resectable axillary nodepositive disease, levamisole, when begun following completion of postoperative radiotherapy, had no effect on either disease-free or overall survival [525]. Nearly a third of patients treated with levamisole had to terminate therapy prematurely because of toxicity (primarily leukopenia, skin rash, nausea, fever, and mucosal infection). It has been argued that differences in patient characteristics led to these discordant results. In head and neck cancer, three reports from the same Italian group have indicated that radiotherapy led to a decrease in both T-cell numbers and functions (LPRs), and that treatment with levamisole accelerated the restoration of T-cell counts, compared to patients who received placebo [26, 27, 382]. With a median follow-up of 30 months, there was some improvement in diseasefree interval for patients who received levamisole. Another similar trial failed to demonstrate an improvement in survival for patients with head and neck cancer treated with levamisole [374].

Isoprinosine In a double-blind, placebo-controlled trial designed to evaluate the immunorestorative effects of isoprinosine following radiotherapy, one half of 106 irradiated patients with breast, head and neck, or uterine cancers were randomly assigned to receive isoprinosine or placebo in discontinuous courses for 5 months. After 3 months of treatment, 64% of the isoprinosine-treated patients exhibited evidence of improvement of DTHS and in vitro functional tests, whereas only 23% of placebo-treated patients did [356]. No correlations have yet emerged between immune reconstitution and clinical status.

Prostaglandin Antagonists The nonsteroidal anti-inflammatory drug oxyphenbutazone was found to improve survival of patients with stage III cervical cancer when administered during radiation therapy [563]. This trial involved 160 patients. Thirty of 73 patients with stage III disease were treated with 100 mg oxyphenbutazone three times daily. Treatment was associated with an improved survival, but no studies were performed to assess the drug’s effect on immune responsiveness.

Robert K. Oldham

Biologicals Thymic Factors Several clinical trials with TF5 and Tα1 have indicated that thymic factors may accelerate the reconstitution of T-cell functions following radiation therapy to head and neck or mediastinal portals. The first clinical trial involved 75 patients with localized but unresectable head and neck cancer [553]. Patients were randomly assigned to receive TF5 (60 mg/m2) subcutaneously in a loading dose (daily for 10 days, then twice weekly) schedule or no further therapy. Treatment with TF5 began concurrently with the initiation of radiotherapy and continued for 1 year or until relapse. TF5 administration did not prevent, nor could it restore, the marked T-cell lymphocytopenia that followed radiotherapy. Patients treated with TF5 exhibited a prolongation of disease-free survival, but of only borderline statistical significance. Similar findings have been reported with Tα1 in postradiotherapy patients with non-small-cell lung cancer [459]. This study was a double-blind, randomdesign trial involving 42 patients with localized, unresectable disease who had just completed a course of radiotherapy to the primary tumor and mediastinum. Patients who received mediastinal radiation were chosen specifically as the study population, based on an in vitro study, indicating that TF5 could increase T-cell proportions of PBMC from patients who had received mediastinal radiation to other portals [272]. Patients whose disease regressed or remained stable at the completion of radiotherapy were randomized to receive Tα1 (900 μg/m2 subcutaneously) either by a loading dose (daily for 14 days, then twice a week) or on a twice-weekly schedule; treatment began within a week after completion of radiotherapy. All patients exhibited a marked depletion in absolute circulating T-cell levels and in T-cell LPRs at the completion of radiation therapy. Serial immunological monitoring revealed that the patients who received Tα1 had a complete normalization of T-cell function in MLR, which became apparent following 7 weeks of treatment. However, only patients treated on the twice-weekly schedule maintained normal Tind/Tc/s ratios throughout the study period. The Tα1 administration, however, did not influence absolute circulating T-cell numbers or T-cell subset numbers, and all treated patients remained lymphocytopenia over the 15-week follow-up period. These results were interpreted to indicate that more intensive schedules of Tα1 administration are optimal for inducing restoration of T-cell functions, whereas less intensive schedules are optimal for maintaining immune balance of T-cell subsets.

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Transfer Factor In a randomized, double-blind trial involving 100 patients with nasopharyngeal carcinoma, transfer factor (derived from young adults with a proven history of infectious mononucleosis and from normal blood donors with high anti-Epstein-Barr virus capsid antigen antibody levels) was administered for 18 months in conjunction with radiotherapy [170]. This trial was based on the association of Epstein-Barr virus with nasopharyngeal cancers. No significant effects of transfer factor were noted on disease-free and overall survival. Immune competence studies were not performed. A study was reported involving 111 patients with NSCLC who had surgery followed by radiotherapy [93]. Twenty-six patients received transfer factor (normal donor) bimonthly beginning after RT was completed. Increased DTHS and a lower relapse rate were observed in patients who received transfer factor, but the small sample size of this trial precludes any definitive interpretations. In a small randomized, placebo-controlled trial of 47 patients receiving radiotherapy with or without chemotherapy for Hodgkin’s disease, DTHS skin responses were markedly enhanced in 22 patients who received transfer factor (prepared from normal donor buffy coat cells), but no improvements were noted in a variety of other immunologic parameters, nor in the prevention of infection, including varicella/zoster [198].

T-cell Reconstituting Factor A pilot clinical trial has been performed in which this factor was administered by SQ injection (2 mg/m2 TIW) for 1 month to 11 patients who had just completed radiotherapy for a variety of locally advanced solid tumors. A variety of immune parameters were followed serially and compared to those of five patients randomized not to receive treatment. Treatment produced a generalized lymphocytosis involving both Tind and Tc/s cell numbers, but no effects were noted on DTHS or LPRs at the dose and schedule employed [112].

Retinoids Therapeutic and immune restorative effects of vitamin A have been evaluated in a randomized trial of 42 patients undergoing radiation therapy for inoperable cervical carcinoma [338]. Vitamin A palmitate was administered orally at a daily dose of 1.5 × 106 IU on days 1–5, 8–12, 16–20, and 23–27, and radiotherapy began on day 22 for 8 weeks. Vitamin A was well tolerated, although most of the 21 treated patients developed scaling of the skin. Serial immunological assessments were performed on some of the patients. No effects were found on DTHS reactivity, in that only about 50% of

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patients reacted in both the treatment and control groups. Vitamin A treatment increased in vitro LPRs (albeit to a low degree) from pretreatment values, whereas the control patients showed no change or decrease in LPRs during radiation treatment. Thus, it was concluded that vitamin A administered concurrently with radiation could prevent the radiation-induced depression of at least one T-cell function.

Bestatin Several studies have explored the in vivo effects of bestatin in irradiated cancer patients [61, 66, 70, 373]. In a prospective randomized trial, the clinical efficacy of bestatin was evaluated in 151 evaluable patients who had completed a course of local radiotherapy for bladder cancer. Patients were randomly assigned to receive 10 mg bestatin orally, three times daily, for at least 1 year, or no further treatment. The recovery of LPRs to PHA and PPD proceeded at an accelerated rate for 9 months in the bestatin-treated patients [70]. Patients treated with bestatin exhibited a greater percentage of circulating T cells after 1 month of treatment, but levels declined to control values within 3 months. Similar transient changes were noted in NK-like activity. It was concluded that the schedule or dose of bestatin was not optimal, and that either higher doses or intermittent schedules require evaluation. An update of the trial has shown that the bestatin-treated patients exhibited an improvement in disease-free survival compared to the radiotherapy-only group, but no improvement in overall survival [65]. The disease-free survival benefit was more apparent in patients with earlier stages of disease.

OK-432 A large multicenter trial in Japan randomized 382 patients with cervical cancer, stratified by presence or absence of surgery and clinical stage, to radiotherapy with or without intradermal OK-432 starting concurrently at 2-day intervals with the initiation of radiation treatment [106], and continuing biweekly for 2 years. Patients who received OK-432 exhibited a decrease in 3-year recurrence rate, a more rapid restoration in DTHS to PHA, a-polysaccharide antigen, and peripheral blood lymphocyte counts than the control patients.

Combined-modality Studies with Chemotherapy Three major problems in combined-modality studies (Table 3) have made it difficult to draw conclusions concerning the influence of putative immunorestorative agents on chemotherapy-induced immunosuppression:

(a) the changing and varied combination chemotherapy regimens available for clinical use; (b) the lack of welldefined doses and schedules of administration for the immunorestorative agents; and (c) the almost universal omission of detailed serial immunologic assessments of patients receiving treatment. For the most part, these studies have emphasized conventional chemotherapy parameters as their end point, that is, tumor regression rates and overall patient survival, on the assumption that if improvements were noted in patients who received an immunorestorative agent, they would result from undefined immunomodulatory effects on the immune response.

Advanced Disease Three broad approaches are feasible for the treatment of advanced cancer patients with combined chemotherapyimmunorestorative therapy. The putative immunorestorative agent could be administered concurrently with chemotherapy, following the completion of chemotherapy when clinical remission has been achieved, or during maintenance chemotherapy if it is continued. All three approaches have been applied, and most studies have employed levamisole and/or thymic factors.

Chemicals Levamisole This compound has been evaluated in several largescale clinical trials as an adjunct to conventional chemotherapy, with mixed results. In general, levamisole has been administered as either 150–200 mg or 2.5 mg/ kg on 2 consecutive days each week between chemotherapy courses. Serial immunological studies have usually not been performed. In 82 patients with metastatic colorectal cancer, survival of those receiving 5-FU and levamisole was significantly greater than those receiving 5-FU alone [78]. Improvements in response rates and/or survival have also been seen in patients receiving levamisole in addition to combination chemotherapy for advanced breast cancer [278, 281, 497]. In one study, an improvement in DNCB reactivity was noted with levamisole treatment; however, negative reports have also appeared concerning breast cancer [99, 387], colorectal cancer [91], nonsmall-cell lung cancer [107, 129], and malignant melanoma [122]. A report in 669 patients with non-small-cell lung cancer indicated that patients who received combination chemotherapy along with levamisole plus warfarin plus tranexamic acid survived longer than those receiving chemotherapy alone [473].

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Table 3. Summary of combined modality studies designed to treat chemotherapy-induced immunosuppression Cancer types

Outcome

References

Colon

+ − + − + − − + + − − + + +

[78] [91] [278, 281, 497] [99, 387] [475] [107, 129] [122] [445] [390, 391] [441] [119] [111, 286] [82] [295]

+ − + − + − − + + +

[478] [51] [314] [132, 312] [118] [455, 476] [40] [557] [231, 504] [379]

Gastric Ovarian

+ − + − + −

[113, 292, 293] [244, 351] [279, 280] [270] [367] [274]

Breast Non-small-cell lung Non-small-cell lung

+ + +

[241] [162] [557]

Advanced disease Chemicals Levamisole

Breast Non-small-cell lung

Isoprinosine Azimexone Piroxicam Cimetidine Biologicals Thymostimulin

Thymosin Fr. 5 OK-432 Lentinan Bestatin Adjuvant treatment Chemicals Levamisole

Melanoma Multiple myeloma Acute lymphoblastic leukemia Acute myeloblastic leukemia Colon Breast Non-small-cell lung Ovarian Gastrointestinal Melanoma Small-cell lung Non-small-cell lung Small-cell lung Non-small-cell lung Non-small-cell lung Gastric Acute nonlymphoblastic leukemia Colon Breast

Biologicals Thymostimulin Transfer factor OK-432

Levamisole has also been evaluated as an adjunct to maintenance chemotherapy for a variety of hematologic malignancies. Improvements in survival from the start of maintenance chemotherapy have been noted in patients receiving levamisole in cases of multiple myeloma [445] and acute lymphoblastic leukemia [390, 391]. Thus, levamisole did appear to have potential as an adjunct to maintenance chemotherapy for patients with hematopoietic cancers; however, no effects were observed when levamisole was administered concurrently with intensive induction chemotherapy for ANLL [534]. Isoprinosine has been administered concurrently with intravenous 5-FU at various doses without any observable antitumor effects [119].

Azimexone has been administered to ten patients with breast cancer after remission was induced by chemotherapy (CTX, MTX, 5-FU, VCR, prednisone) to assess whether it could ameliorate the immunosuppressive effects of treatment. Detailed weekly serial immunological assessments, performed while patients were receiving 100-mg weekly intravenous injections, revealed that chemotherapyinduced immunosuppression was markedly reversed during azimexone administration. Significant increases in peripheral blood lymphocyte counts and in vitro LPR were noted without change in T- or B-cell percentages [111, 286].

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Prostaglandin Inhibitors It has been demonstrated that the concurrent administration of nonsteroidal anti-inflammatory drugs can prevent some aspects of chemotherapy-induced immune suppression [82].

Cimetidine A study of the immunomodulatory effects of cimetidine was performed in patients with advanced ovarian cancer who received concurrent chemotherapy (cisplatin, ADR, CTX) [275]. Treatment with chemotherapy produced a decrease in CD4 cell counts and in IL-2 production of PBL, which was significantly improved in patients who received concurrent cimetidine.

Biologicals Thymic Factors Two studies performed in the late 1970s with TP-1 and TF5 suggested both a rationale and role for the use of thymic factors in conjunction with combination chemotherapy [478]. Although overall response rates were not altered by TF5, its administration at a high dose (60 mg/ m2) led to a significant improvement in overall median survival [116]. Improved survival was limited to patients who had exhibited pretreatment depressions of total T-cell levels below 775/mm3 and serum HS glycoprotein levels below 60.5 mg/dl. Although serial immunological assessments were not performed, it was concluded that, whereas TF5 had no detectable direct antitumor effects, its administration to immunosuppressed patients may have improved survival by ameliorating the immune defects due to the presence of tumor, and exacerbated by the chemotherapy. These two reports culminated in the performance of a number of confirmatory trials, as well as a variety of other studies in which TF5 and TP-1 were administered concurrently with combination chemotherapy for patients with solid tumors, generally small-cell or NSCLC [40, 51, 132, 312, 314, 455, 476]. In only one of these studies did the administration of thymic factors improve the overall response rate to the chemotherapy and survival [314]. Although this trial involved very small patient numbers, the favorable effects of TP-1 on both myelotoxicity and survival indicate that further studies should be performed adding TP-1 to conventional chemotherapy. In a randomized trial involving 91 of patients with small-cell lung cancer [455, 476], TF5 (60 mg/m2 subcutaneously, twice weekly) had no effect on survival when combined with chemotherapy, compared to chemotherapy alone (CTX, ADR, VCR alternating with

VP-16, cisplatin). An analysis based on pretreatment immune function, total white blood cell count, and absolute lymphocyte count revealed no difference in survival distributions. These results could not confirm the prior reported study [118]. However, this latter trial differed from the original study in that it used different chemotherapy regimens and included prophylactic chest and whole-brain radiotherapy for patients who responded to chemotherapy. Thus, no firm conclusions can be reached regarding the role of TF5 as an adjunct to chemotherapy for small-cell lung cancer. Several different trials in patients with advanced non-small-cell lung cancer treated with combination chemotherapy with or without TF5 [41] or TP-1 [132, 312] and in metastatic melanoma patients treated with TP-1 [51] failed to find improvements in survival for patients treated with thymic factors. In one of the lung cancer trials, only immunosuppressed patients were considered eligible for study; however, no significant immunorestorative effects were noted in the TP-1-treated patients except transient mild improvement in absolute T-cell levels. In vitro LPR to mitogens remained suppressed following treatment, and no improvements in DTHS were observed. Thus, follow-up combined modality studies with TF5 and TP-1 have not provided evidence that thymic factors could either prevent chemotherapy-induced immunosuppression or improve survival.

Lentinan In small studies, administration of lentinan in combination with tegafur [504] or 5-FU and mitomycin [231] to patients with advanced gastric cancer has been reported to improve patient survival.

Bestatin In a randomized controlled trial of 101 patients with ANLL, patients over 50 years of age who received bestatin along with induction chemotherapy exhibited a better remission duration and survival than the chemotherapy-only group [379].

Adjuvant Chemotherapy Adjuvant chemotherapy has become an accepted treatment modality for patients with breast and colon cancer. Evidence is also accumulating that postsurgical adjuvant chemotherapy for other solid tumors may also improve patient survival. The acute and chronic immunosuppressive effects of contemporary adjuvant chemotherapy regimens have recently been evaluated [315, 396, 501].

Robert K. Oldham

Chemicals Levamisole In a randomized trial of 135 postoperative breast cancer patients with positive axillary nodes, patients received L-phenylalanine mustard with levamisole (150 mg for 3 days every 2 weeks) or placebo for up to 2 years [270]. No significant effects of levamisole were noted, although trends for improved survival were seen in postmenopausal patients and in those with four or more positive lymph nodes. In other studies involving patients with stage III breast cancer treated by either radiotherapy or adjuvant chemotherapy (ADR, CTX, VCR), there was a high incidence of toxicity (primarily transient agranulocytosis), requiring discontinuation of levamisole. Follow-up is continuing on this trial. In a study comparing postoperative radiation therapy and adjuvant chemotherapy (vincristine, adriamycin, and cyclophosphamide), levamisole administered concurrently appeared to improve both disease-free, as well as overall, survival for patients who received chemotherapy alone or combined radiation therapy plus chemotherapy [279]. Improvements were also noted in various immune parameters in the levamisole treatment group [305]. Although this trial involved 150 patients, the multiple randomizations made it difficult to analyze. In other recent studies, levamisole was shown to improve the survival of resected patients with gastric cancer treated with MIT and tegafur [367], but there was a deleterious effect of levamisole in a trial of 140 patients with ovarian cancer who received adjuvant chemotherapy following maximal surgical reduction of tumor [274].

Biologicals Transfer Factor The administration of transfer factor, prepared from leukocytes from household contacts, has been reported to improve survival for stage I and II patients with resected non-small-cell lung cancer who were treated further with a variety of adjuvant combination chemotherapy regimens [162].

OK-432 In a trial of 311 patients, OK-432 was shown to improve survival of patients with resected stage I, II and III nonsmall-cell lung cancer when combined with three-drug combination chemotherapy, compared to chemotherapy [557].

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Thymic Factors In a randomized trial 51 patients received adjuvant CMF chemotherapy with or without TP-1 (50 mg/m2 IM daily × 2 weeks, then twice weekly for a minimum of 3 months) following radical mastectomy for breast cancer [241]. Although details of the patients’ clinical characteristics were not reported, patients who received TP-1 exhibited a significant decrease in the incidence of infections (mostly cystitis, conjunctivitis, and mucositis), and an increase in Tind/Tc/s compared to the control (no treatment) group. There was also a lower incidence of myelotoxicity in the TP-1 treated patients. These results have not been confirmed with a large-scale trial.

Current Status of Therapeutic Alterations for Cancer-associated Immune Suppression The results with levamisole in combination with 5-FU as adjuvant therapy for Dukes C colon cancer have provided strong evidence that drugs with immunorestorative properties can play a role in the treatment of human cancer. What has been learned about the reversibility or prevention of cancer-associated immunosuppression? All of the agents discussed in this chapter, at least in small phase I and II studies, appear to have the capability of improving immune cell numbers and/or functions in immunosuppressed patients. The large-scale phase III surgical adjuvant trials for the most part have provided only limited information concerning whether or not perioperative immunosuppression could be prevented. Part of this relates to the fact that it is extremely difficult – and probably impossible – to perform adequate, quality control assays of immunity in multiple different institutions participating in the same large-scale trial. The mechanism by which levamisole improved survival was not addressed, and it is not clear whether the drug exerted its effects as a result of immunomodulation or by other, as yet undefined, mechanisms. Several smaller studies in patients with GI cancers suggested that certain aspects of T-cell immunity (i.e., LPR) could be maintained during the perioperative period by treatment with levamisole. Since these studies, FA/5-FU and later FOLFOX regimens have become the regimen of choice in adjuvant therapy of colon cancer. Studies with levamisole, TF5, Tα1, bestatin, and vitamin A have suggested that various immunorestorative agents could ameliorate radiotherapy-induced depression of T-cell numbers or functions, or accelerate the

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reconstitution of immunity following radiotherapy. In no case, however, did treatment totally normalize both T-cell numbers and functions, and so efficacy can be considered partial at best. In several clinical trials, levamisole has not improved survival in irradiated patients with non-small-cell lung cancer. Analysis of the trial in postradiotherapy patients with non-small-cell lung cancer has suggested that Tα1 can improve overall patient survival when used as an adjunct to radiotherapy. However, the mechanism by which Tα1 improved survival is not known. In addition to accelerating the reconstitution of T-cell dependent immunity, it is possible that thymic factors can protect bone marrow stem cells from the myelotoxic effects of radiotherapy or chemotherapy [241]. Such a mechanism has been proposed to explain the lower incidence of myelotoxicity in breast cancer patients who received TP-1 along with adjuvant CMF chemotherapy [241]. Because radiation therapy results in a uniform and marked depression of immune cell numbers and functions, patients who have received this treatment are ideal candidates for studies of the immunorestorative effects of BRMs. However, it must be recognized that if putative immunorestorative agents are administered concurrently with radiation, their effects on immunity might be negated to some degree. An agent could exert a beneficial effect during radiation treatment only if it provided a direct protective action on immune cells from the deleterious effects of radiation. Although a number of large-scale clinical trials have been performed with patients receiving concurrent chemotherapy, there are only very limited data concerning the prevention of chemotherapy-induced immunosuppression. Several studies have suggested that levamisole may have a role as a therapeutic adjunct for patients with hematopoietic malignancies who are receiving maintenance chemotherapy, yet the mechanism by which levamisole exerts its effects remains unknown. Although none of the immunorestorative agents have proven effective when administered concurrently with intensive combination chemotherapy for patients with advanced metastatic cancers, their potential role in patients treated with adjuvant chemotherapy remains to be explored. The success or failure of future studies with BRMs will be determined primarily, if not exclusively, by the selection of suitable phase II and III clinical models for study and by the avoidance of confounding variables or inadequate sample sizes, which could lead to uninterpretable results. It is likely that a two-phased approach will be necessary to evaluate BRMs with immunorestorative properties: focusing initially on phase I/II,

single-institution pilot studies to establish the pharmacokinetics and immunomodulatory potential of the agent, and then in properly stratified, large-scale phase III randomized trials performed by a cooperative cancer group to establish clinical efficacy using the optimal immunomodulatory dose and schedule and an appropriate patient population. Acknowledgment Dr. Richard Schulof co-authored this chapter in the second edition, but died in an automobile accident during the preparation of the third edition.

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7

Cancer vaccines KENNETH A. FOON AND MALEK M. SAFA

Introduction Immune approaches to the therapy of cancer have substantially evolved over recent years, from treating patients with nonspecific immune stimulants to a focus on the use of tumor-associated antigens (TAAs) either by passive immune therapy with antibodies targeted directly to tumor cells or by active immune therapy via vaccinations with tumor cells, tumor cell lysates, peptides, carbohydrates, gene constructs encoding proteins, or anti-idiotype antibodies that mimic TAAs.

Approaches to Cancer Vaccines Specific active-immunotherapy differs from nonspecific immune-based therapies such a BCG in that the goal is not general but rather specific activation of the immune system to eliminate tumor cells and not affect surrounding normal tissue. Theoretically, specific immunotherapy through vaccines activates a unique lymphocyte (B-and/ or T-cell) response, which has an immediate antitumor effect as well as memory response against future tumor challenge. The first and most obvious type of vaccines is autologous or allogeneic tumor cell preparations (Table 1). Alternatively, membrane preparations from tumor cells have been used. In either instance these vaccines have been combined with a variety of cytokines. Genemodified tumor cells expressing antigens designed to increase immunogenicity or gene modified to secrete cytokines have been a valuable tool for vaccination. In addition, increase in our knowledge of TAA biology has led to the use of purified TAAs, DNA-encoding protein antigens, and/or protein-derived peptides. All of these approaches are being tested in the clinic. Mechanistically, the ultimate aim of a vaccine is to activate a component of the immune system such as antibodies or lymphocytes against TAAs presented by the tumor (Table 2). Antibodies must recognize antigens in the native protein state at the cell surface. Once bound, these molecules can mediate ADCC or complement-mediated cytotoxicity. T lymphocytes, on the other hand, recognize proteins as fragments or peptides of varying size, presented in the context of MHC anti-

R.K. Oldham and R.O. Dillman (eds.), Principles of Cancer Biotherapy, © Springer Science + Business Media B.V. 2009

gens on the surface of the cells being recognized (Fig. 1) [1–3]. The proteins from which the peptides are derived maybe cell surface or cytoplasmic proteins [4, 5]. MHC antigens are highly polymorphic, and different alleles have distinct peptide-binding capabilities. The sequencing of peptides derived from MHC molecules has led to the discovery of allele-specific motifs that correspond to anchor residues that fit into specific pockets on MHC class I or II molecules [6, 7]. There are two T lymphocyte, helper and cytotoxic, which recognize antigens through a specific TCR composed of both α and β subunits arranged in close conjunction to the CD3 molecule, which is responsible for signaling. CD4 helper T cells secrete cytokines and lymphokines that enhance immunoglobulin production as well as activate CD8 CTLs. CD4 helper T cells are activated by binding via their TCR to class II molecules, which contain 14–25 amino acid (mer) peptides in their antigen-binding cleft [8–10]. Extracellular proteins are endocytosed and degraded (exogenous processing into 14–25 mer peptides in endocytic compartments (acidified endosomes) ) and bind to newly synthesized MHC class II molecules. The MHC peptide complex is transported to the cell membrane, where it can be recognized by specific CD4 helper T cells. In most cased the MHC class II antigen-containing peptide is presented to the CD4 helper T cells by a specialized cell called an antigen presenting cell (APC). More specifically, a variety of cells are capable of processing and presenting exogenous antigen including B cells, monocytes, macrophages, and the bone marrow derived derndritic cells (DC). DCs are the most efficient APCs and express high levels of MHC class I and II molecules, costimulatory molecules such as CD80 and CD86, and specific markers such as CD83. After antigen uptake, DCs migrate peripherally to lymph nodes, where antigen presentation to CD4 helper T cells takes place [11, 12]. There are two types of CD4 helper T cell capable of generating either an antibody-or a cell-mediated immune response. This is based on the type of signaling they receive. Th1 CD4 helper T cells stimulate cell-mediated immunity by activating CTLs thought the release of lymphocytokines such as IL-2. Th2 CD4 helper T cells mediate an antibody response through the release of lymphocytokines such IL-4 and IL-10. In some instances

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Cancer vaccines Table 1. Tumor vaccines Autologous tumor vaccines Allogeneic whole cell vaccines Dendritic cell vaccines Viral oncolysates Polyvalent shed antigen vaccines Peptide vaccines Anti-idiotype vaccines Genetically modified vaccines Recombinant viral vaccines DNA vaccines

Table 2. Characteristics of different vaccines Response characteristics Vaccine Autologous cells Allogeneic cells Shed antigens Carbohydrate Peptide Anti-idiotype antibody Dendritic cell DNA

Multiple antigens

Single antigen

Antibody response

T cell response

+ + + − − −

+ − − + + +

+ + + + + +

+ + + − + +

NA −

NA +

+ +

+ +

the generation of one type of response may serve to inhibit the generation of the other (ref. 13, i.e., IL-10 secretion by Th2 helper T cells inhibits the generation of CTLs). CD8-positive CTLs are activated in most cases by peptides derived from intracellular proteins that are cleaved to 9–10 mer peptides in the cytosol of tumor cells or APCs by proteosomes. The peptides are then transported via specialized transporter molecules called TAP proteins to the endoplasmic reticulum, where they become associated with newly synthesized MHC class I molecules [14]. The complex is then transported via the Golgi apparatus to the cell surface membrane, where the complex is recognized by CD8 cytotoxic T cells via a specific TCR. Any endogenously processed protein can be presented to the immune system in this way. Several reports suggest a subset of APCs can present exogenously processed proteins on MHC class I molecules to CTLs [15–19].

Pitfalls in Developing Cancer Vaccines Tumor cells have developed a variety of mechanisms to escape immune surveillance. DC’s are actively inhibited in the tumor milieu. Both immature and defective DCs

+, present; −, absent; NA, not applicable Vaccine (cells, lysates, protein, peptide, cDNA)

14 25mer peptide

Antigen Presenting Cell (APC)

MHC Class II

Exogenous protein from lysed tumor

CD4 T -cell

TCRS CD

IL - 2

TC CD R S

MHC Class

9 10 mer peptide

CD8 T -cell

R TC S CD

Tumor cell undergoing lysis

IL - 4 IL - 5 IL - 10

Tumor cell

B -cell

Figure 1. T cell activation: T cells recognize antigens as fragments of proteins (peptides) presented with major histocompatibility complex (MHC) molecules on the surface of cells. The antigen-presenting cell processes exogenous protein from the vaccine or from the lysed tumor cell into a peptide, and presents the 14/25-mer peptide to CD4 helper T cells on a class II molecule. There are also data to suggest that exogenous proteins can be processed into 9/10-mer peptides that may be presented on MHC class I molecules to CD8 cytotoxic T cells. Activated Th1 CD4 helper T cells secrete Th1 cytokines such as IL-2 that up-regulate CD8 cytotoxic T cells. Activated Th2 CD4 hepler T cells secrete Th2 cytokines such as IL-4, IL-5, and IL-10 that activate B cells

Kenneth A. Foon and Malek M. Safa are described in a variety of tumors. In addition, DC’s that present tumor antigens, may fail to reach the T cells in lymph nodes that generate active immune responses against tumors. The immune response may be skewed toward a Th2 response or T cells may be anergic. Immune regulatory cells may contribute to immune tolerance. CD4 positive T cells (T-reg) with a high affinity receptor for CD25 that co-express the intracellular marker Foxp3 also play an important role in immune tolerance [20, 21]. Mutation or down regulation of immunodominant tumor antigens, MHC molecules, or molecules involved in the antigen processing machinery may also in part explain the escape of tumor cells from immune recognition [22–24]. Down regulation or mutation of pro-apoptotic molecules and expression of anti-apoptotic molecules may also render tumor cells resistant to apoptosis. Tumor cells may acquire mechanisms that may actively contribute to immune tolerance. For instance, Fas ligand (FasL) – expressing tumors can deliver an apoptotic signal to activated T cells and natural killer (NK) cells expressing Fas receptor. The tumor microenvironment may also contain soluble factors that inhibit T cell function. Factors such as TGF-beta, prostaglandins, IL-10, and catabolizing enzymes are produced by tumor cells themselves or by stromal cells that may lead to T cell hyporesponsiveness. Countering these various tumor escape mechanisms is a key component to successful vaccine therapy.

Mechanisms to Improve the Immune Response Potent adjuvants improve the effectiveness of vaccines by accelerating the generation of immune responses and sustaining responses for extended periods of time. Commonly used adjuvants such as alum or Freund’s are effective in elevating antibody titers but do not elicit significant Th1 responses or activate cytolytic T lymphocytes (CTL’s). The current focus is on the generation of adjuvants that are designed to specifically elicit cellular immune responses. Toll-like receptors (TLRs) are known to be involved in the initiation of immune responses. CpG stimulates TLR9 and has been used with vaccines to augment immune responses [25]. TLR8 may be involved in the activity of T-reg cells. Strategies aimed at TLR8 are proposed to neutralize T- reg cells [26]. One approach to decrease the role of T-reg cells is to use immunotoxin directed against the high affinity IL-2 receptor [27, 28]. Monoclonal antibodies specific for the negative regulatory signals mediating the CTL

149 antigen 4 (CTLA4) on T-reg cells has also been tested to enhance the anti-tumor immunity to vaccines [29]. Cyclophosphamide has been used for many decades to boost immune response [30–32], as have other chemotherapy agents [33, 34].

Cancer Prevention Vaccines A major success story in cancer vaccinology is cancer prevention targeting the human papillomavirus (HPV) to prevent cervical cancer. Cervical cancer is the second most common cancer in women responsible for over 250,000 deaths annually worldwide. Seventy percent of cervical cancers are caused by the two most common oncogenic HPV types, HPV-16 and HPV-18, while another 10% are caused by HPV-45 and HPV-31 [35]. The Food and Drug Administration has approved the cancer prevention vaccine HPV-16/18/6/11 (Gardisil, Merck & Co. Inc, Whitehouse Station, NJ). This vaccine uses recombinant DNA technology to develop subunit vaccines which include only the epitopes from the pathogen recognized by the immune system. Copies of the L1 viral capsid protein, the same protein which antibodies are generated against in the natural immune response to HPV, spontaneously self-assemble into noninfectious virus-like particles which are used as the antigen in the prophylactic vaccine. The vaccine is formulated with ASO4 (aluminum hydroxide and monophosphoryl lipid A) adjuvant [36, 37]. Only half the women with HPV infection develop protective immunity because the natural infection by HPV evades detection of the immune system. Clinical studies demonstrated seropositivity in women who receive the HPV 16/18/6/11 vaccine was 100% for HPV-16 and HPV-18 1 month after vaccination and remained at 100% 4.5 years after vaccination [38–40]. Efficacy against cervical intraepithelial neoplasia associated with HPV-16 was 100%. Of course, many women are already infected with HPV and will develop cervical intraepithelial neoplasia and remain at risk for developing cervical carcinoma. A number of HPV based cervical vaccines are in development that are designed to eliminate HPV induced disease after infection.

Therapeutic Cancer Vaccines There has not yet been a therapeutic cancer vaccine approved by the US FDA, however, there are a number of success stories and near success stories that should lead to approval in the near future. Melacine is composed of lyophilized melanoma lysates from two melanoma cells

150 lines and the adjuvant Detox. In a phase 3 trial of 604 patients with resected stage 3 melanoma, patients were administered Melacine and low dose interferon alpha2b versus high dose interferon alpha-2b [41]. Patient’s were stratified by sex and number of nodes and randomly assigned to receive either 2 years of treatment with Melacine and low dose interferon alpha-2b or high dose interferon alpha-2b alone for 1 year. The median overall survival exceeded 84 months on the melancine low dose interferon alpha-2b (arm 1) versus 83 months in the high dose interferon alpha-2b (arm 2) (p = 0.56). Five year overall survival was 61% in arm 1versus 57% in arm 2 and estimated 5 year relapse-free survival was 50% in arm 1 versus 48% in arm 2 with median relapsefree survival times of 58 months in arm 1 and 50 months in arm 2. Overall survival and relapse-free survival were clearly indistinguishable in the two arms. The incidence of neuropsychiatric severe adverse experiences were similar, although they were more severe in the high dose interferon alpha-2b arm. The primary aim of this study was that Melacine plus low dose interferon alpha-2b would prolong overall survival compared with high dose interferon alpha-2b. Unfortunately, this primary aim was not met, and their results failed to demonstrate rejection of the null hypothesis, with nearly identical survival curves. Melacine was approved in Canada based on quality of life improvements. DC vaccines are an attractive approach to vaccine therapy although they are labor intensive requiring unique autologous DC preparations from individual patients (Table 3). Sipuleucel-T and DCVax-Prostate are both vaccines based on DC’s engineered to present T-cell antigens associated with prostate cancer [42, 43]. Sipuleucel-T consists of autologous DC and a fusion prostatic acid of prostates and phosphatase and granulocyte macrophage colony stimulating factor (GM-CSF). A randomized phase 3 placebo controlled trial in patient with metastatic asymptomatic androgen-independent prostate cancer was completed. Eighty-two patients were randomized in a 2:1 ratio [44]. The primary endpoint of this study which was progression-free survival was not reached (p = 0.052). However, overall survival was significantly different for vaccine (26 months) versus placebo (21 months) with a hazard ratio of 1.7 and p = 0.01. A second study showed a trend toward increased survival (19 months versus 16 months) but did not reach significance. A phase 3 clinical trial using survival as an end point is ongoing. GVAX consists of two irradiated allogeneic prostate cancer cell lines engineered to secrete GM-CSF [45, 46]. Two phase 2 trials have been completed in patients with asymptomatic metastatic androgen-independent

Cancer vaccines Table 3. Selected therapeutic vaccines in phase 3 development Vaccine Antigen-loaded dendritic cells Sipuleucal-T DCVax-prostate Monified tumor cells OncoVax-CL GVAX Idiotype vaccines Favid BiovaxID MyVax Viral vector INGN-201 TroVax Peptides TV-1001 (telomerase) BLP-25 (MUC1) Carbohydrate GMK

Company

Indication

Dendreon Corp Northwest Biotheraputics Inc

Prostate Prostate cancer

Intracel Corp Cell Genesys Inc

Colon cancer Prostate cancer

Favrille Inc

Follicular lyphoma Follicular lyphoma Follicular lymphoma

Biovest International Inc Genitope Corp Introgen Therapeutics Inc Oxford BioMedica

Head and neck cancer Renal cell cancer

GemVax AS

Pancreatic cancer Non-small cell lung cancer

Merck KGA Progenics Pharmaceuticals Inc

Melanoma

prostate cancer. In the first study, patients were treated at two dose levels with median survival at the low-dose of 24 months and at the high dose of 35 months. A second study used five vaccine doses. The median survival at the low and middle doses was 23 months and 20 months respectively and was not yet reached at the high dose (>29 months). Phase 3 trials are ongoing. There are a number of non-cell based patient specific vaccines that are currently in phase 3 trials. Favid, BiovaxID and MyVax are idiotype vaccines that use KLH as a carrier. All three are patient specific for patient’s with B-cell lymphoma. Anti-idiotype immune responses have been shown to correlate with better clinical outcomes in follicular lymphoma patients who received idiotype vaccines [47, 48]. MyVax is also being studied in phase 2 trials for mantle cell lymphoma, diffuse large B-cell lymphoma and chronic lymphocytic leukemia. INGN-201 is a recombinant adenovirus-p53-based vaccine for head and neck cancer. The adenovirus theoretically functions to deliver the p53 protein in large quantities to the tumor cells. While this is classified as a gene therapy, there is evidence that suggests an immune response is elicited by p53 which is overexpressed in

Kenneth A. Foon and Malek M. Safa

151 endocytosis of anti-Id by APC

processed to 9/10 mer peptides

MHC class II

MHC class I+ peptide CD8

IL-2r

processed to 15/25 mer peptides

MHC class I

MHC class II+ peptide TCR

APC TcR CD4

CD8 T cell clonal proliferation

Activated CD8 T cell

Th1 cytokines (IL-2, IFN-γ)

CD4 T cell

Th2 CD4 Mφ cytokines NK T (IL-4, IL-10) direct ADCC lysis TcR

MHC class II

CD8

Granzymes Preforin INF-γ TNF-β

Anti-antiId (Ab11)

MHC class I+ peptide

Tumor cell

TCR MHC class II+ peptide

processed to 15/25 mer peptides

B cell recognition of anti-Ιd and endocytosis of anti-Ιd

B Cell

mediates ADCC and direct anti-metastatic effect

Figure 2. Putative immune pathways for anti-id vaccines

the tumor. Therefore, p53 may be considered a tumorassociated antigen and may aid in the elimination of tumor cells [49]. Interestingly, an adenovirus-p53 gene therapy vector (Gendicine) has been approved in China for head and neck cancer. TroVax is a vaccine in which the tumor associated antigen 5T4 is expressed in a modified vaccinia Ankara (MVA) vector, which induces strong immune response similar to the live virus. It is expected that the recombinant 5T4 antigen will be included in the antiviral immune response. This vaccine is in phase 3 trials for renal cell cancer. TV-1001 is a telomerase peptide based vaccine that is in phase 3 trials for pancreatic cancer. Telomerase is over expressed in many cancers and is theoretically a good target antigen. GMK is a ganglioside conjugate vaccine in which ganglioside GM2 is coupled to KLH and formulated with QS-21 adjuvant [50]. The goal of this vaccine is to induce an antibody response rather than a T-cell response

[51]. This vaccine is in phase 3 trials for melanoma. BLP-25 is a liposome-encapsulated synthetic peptide that corresponds to the variable number 10 tandem repeat region of the mucin (MUC)-1 molecule. MUC-1 is overexpressed and underglycosylated on tumor cells. The MUC-1 target is highly represented on most epithelial tumors. There is currently a phase 3 trial in non-small cell lung cancer using BLB-25.

Conclusion The platform for therapeutic vaccines is broad including a variety of antigens, both non specific antigens represented by whole cell based vaccine approaches and recombinant antigens as represented by the protein and virus based approaches. DC’s are an extremely appealing vaccine approach, however, they are limited by the

152 difficulties associated with patients specific cell therapies. No specific approach to vaccine therapy has stood out as clearly superior. Strategies to enhance the immune response will be the next most important step in therapeutic cancer vaccines. Monoclonal antibodies inhibiting T-regs, the use of a variety of cytokines and TLR stimulation are among the strategies that will be employed.

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8

Cytokines WALTER M. LEWKO AND ROBERT K. OLDHAM

Cytokines are regulatory proteins, produced and secreted by various cells, which control immune response, hematopoiesis, inflammation, wound repair and tissue morphogesis. Cytokines may be secreted or membrane bound. Secreted cytokines may act locally as autocrine or paracrine factors or over some distance as would a hormone. Membrane bound cytokines act by cell–cell contact, communicating information from one cell to another, often bidirectionally. There are cell surface receptors for each cytokine that bind the cytokine specifically. Receptor subunits may be shared between different cytokines. Binding the cytokine brings about signaling and a series of cell activating events. For many cytokine receptors (not all), this involves increased phosphorylation of certain tryrosine residues on key cellular proteins. Kinases are the enzymes that carry out phosphorylation. Receptors may themselves be kinases, which activate upon binding. More typically, the activated receptor may recruit cytosolic kinases, for example, mitogen activated protein kinase (p38 MAPK)1 and Janus kinases (Jak1, Trk and Jak 3) [97, 533, 556, 1009, 1699]. As the kinases bind the receptor complex, their enzymatic activities increase and an array of cellular proteins is phoshorylated, in certain cases including the receptor itself. These modifications bring about changes, increases or decreases, in each protein’s activity. Among these proteins are the STAT proteins that control gene expression. When phosphorylated, STAT proteins translocate from the cytoplasm to the nucleus and bind specific enhancer segments allowing the expression of the genes needed to bring about a cytokine’s response. In this chapter, several of the major cytokines will be discussed. Regulation of cellular immunity will be emphasized for its role in the elimination of tumor and virus infected cells. Inflammation is discussed for its important role in not only in immune response but also cancer progression. Unfortunately, it is not possible to cover all of the interesting cytokine research in detail. We have tried to summarize past results and highlight certain interesting trends. The interferons, colony stimulating factors and certain growth factors are covered in other chapters in this

1

Abbreviations are listed at the end of the chapter.

R.K. Oldham and R.O. Dillman (eds.), Principles of Cancer Biotherapy, © Springer Science + Business Media B.V. 2009

book. Table 1 summarizes cell sources and effects of cytokines discussed.

Cytokine Receptors: Many Belong to Receptor Families Cytokines usually induce their effects by binding to target cell receptors, which generate intracellular signals. Often the result is gene activation. The receptors for the various cytokines tend to be grouped into families reflecting common genetic origin, structure, signaling and cell response. Some of the major receptor groups include the IL-1 family, cytokine/hematopoietin receptor family, the IL-6 family, the IL-17 family and the tumor necrosis factor family. For example, the receptors for IL-2, IL-3, IL-4, IL-5, IL-6, IL-7, IL-9, IL-13, IL-15, G-CSF, GM-CSF and Prolactin are all members of the hematopoietin receptor family. Receptors for these cytokines have been cloned and analyzed. Amino acid sequence reveals segments that are similar between members of the same family [1472]. The IL-6 family members share the gp130 signaling subunit [1943]. Receptors are generally composed of two or more subunits. In a basic model, one subunit binds the ligand; the other subunit generates the signal; together in a complex, the subunits bind the cytokine with higher affinity than they do separated. Different receptors may share subunits that carry out common functions. For example, several receptors (IL-2, IL-4, IL-7, IL-9, IL-13, IL-15, IL-21) share a common gamma subunit (γc) that is involved in signaling. The importance of this gamma chain’s function is shown in various forms of combined immunodeficiency disease that appear due to mutations [259, 1097, 1699]. Since this receptor subunit is shared by so many cytokines, these genetic defects have far reaching and debilitating results in the immune response system. Cytokine activity is of necessity transient. Uncontrolled activity may result in inflammatory diseases, allergy or autoimmunity. There are several levels at which regulation may occur, from cytokine secretion to receptor binding to intracellular signaling to target cell responsiveness. For example, there are cellular proteins that regulate signaling [492, 1413, 1882, 2256]. Among them are the 155

156

Cytokines

Table 1. Summary of cytokine sources and effects related to the growth and treatment of cancera Cytokine

Cell source

Cells influenced

Effectb

IL-1

Mono/Macro B cells T cells NK DC Some tumor cells Fibroblasts Keratinocytes Endothelial Glial cells Eosinophils Neurons Epithelial Synovial

IL-2

T cells (active)

IL-3

T cells (active) Thymic epithelium Mast cells Keratinocytes Neurons Eosinophils

IL-4

Th2 Mast cells Basophils NK

Macrophages B cells T cells Th2 Mast cells LAK NK Tumor cells Fibroblasts Chondrocytes Keratinocytes Endothelial Vascular smooth muscle Eosinophils Basophils Liver Synovial Glial cells Neurons Pancreatic Islet Muscle DC Stem cells Hypothalamus Some tumors Melanoma B16 NK LAK T cells PBL B cells Macrophages DC Keratinocyte Eosinophils Tumor cells Stem cells Megakaryocyte RBC precursors Mast cells Natural cytotoxic Granulocytes Macrophages NK T cells Osteoclasts Hematopoietic tumor B cells T cells Th0 Mono/Macro

Activation, TNF, IL-6, PGE2, NO (w/IFNγ) Growth/Ig (w/IL-4, IL-6), chemotaxis Growth (w/IL-2), migration, IL-2, IL-2R, IFNγ Growth, IL-4, IL-5, IL-6 IL-3, IL-4, IL-5, IL-6, IL-9 (Th2-like cytokines) Induction (w/IL-2) IFNγ (w/1L-12), cytotoxicity (w/IFNγ) Growth/inhibition/metastasis/no effect Growth, PGE2, collagen ↓ Growth, ↓ collagen, ↑ protease Growth PGE2, VCAM, ICAM, angiogenesis Growth, IFNβ Degranulation Degranulation, histamine release Metabolism, protein production PGE2, collagenase, phospholipase A2 Growth Survival Insulin Negative protein balance (w/insulin, IL-1, TNF) Maturation (w/GM-CSF) Viability/survival (w/IL-3, G-, M-, GM-CSF) Corticotrophin releasing factor ↓ Growth ↑ Metastasis (↑ endothelial VCAM) Activation/cytotoxicity Activation/cytotoxicity Growth/cytotoxicity/tolerance/AICD Growth/CTL generation Growth/differentiation (w/IL-6, IL-12) Activation, TNFα, β, NO Proliferation Proliferation Eosinophilia Growth/inhibition/no effect ↓ ICAM/↓ MHCI Growth Platelet production RBC production Survival/growth (w/IL-4) Growth/TNF Growth/survival/differ Growth/differ/activation Activation (w/IL-2) Activation/growth (w/IL-2) ↑ or ↓ Growth stimulation/inhibition/no effect Growth, Ig secretion (IgG, IgE), MHCII Growth stimulation/inhibition/no effect Differentiation to Th2, inhibition formation Th1 Growth/activation/AP/HLA DR ↓ Inflammatory cytokines Growth/VCAM Growth Growth (IL2-primed) Growth/IL5 secretion (w/IL-2, IL-12) Growth/ICAM (w/IL-3) Activation (IL-2 primed) Growth/activation (w/IL-2, IL-7, GM-CSF)

Eosinophils DC γδ T cells NK T cells

Endothelial Fibroblasts PBL NK Mast cells LAK DC

(continued)

Walter M. Lewko and Robert K. Oldham

157

Table 1. (continued) Cytokine

Cell source

IL-5

Th2 Eosinophils Mast cells NK

IL-6

Fibroblasts Macrophages Epithelial Endothelial Eosinophils Neutrophils Mast cells B cells Keratinocytes Th2/CD8 T Osteoblasts Synoviocytes

IL-7

IL-8

IL-9

IL-10

Megakaryocytes Langerhans cells Astrocytes DC Some tumors Stroma, marrow Stroma, thymus Keratinocyte B cells Intestinal epithelium DC Endothelial Some carcinomas Leukemia/lymphoma Macrophages Endothelial Neutrophils Eosinophils Mast cells Epithelial cells Fibroblasts Keratinocyte Some melanomas Some carcinomas Th2 Mast cells

Th2, mice Th1 Th2, humans Tr1 nTreg B cells

Cells influenced

Effectb

Hematopoietic cells Certain tumors Eosinophils B cells Mast cells T cells LAK NK B cells T cells Megakaryocytes NK Hepatocytes Intestine cells Fibroblasts Osteoclasts Endothelial Neurons Melanoma Leukemia/lymphoma↓ growth Breast cancer Cervical cancer DC

Growth (+/−) ↓ Growth, ↓ COX-2, ↓ PGE2 Growth/differ/survival/activity/chemotaxis Growth/survival/Ig (IGA, IgM) Growth (w/other factors) Growth/differentiation (w/IL-2), IL-2R Activation (w/IL-2) Activation (w/IL-2), IL-2R Differentiation/Ig (w/IL-2)/survival Growth/activation (w/IL-2) Growth/platelets Activation/cytotoxicity Acute phase proteins, fibrinogen Acute phase proteins Growth/collagen Growth/activation Growth Regeneration ↓ Growth ↓ Growth

Pre-B cells Pre-T cells Mono/macro NK LAK T cells (w/IL-2) DC TIL Pre-eosinophils Melanoma Some leukemia/lymp Neutrophils T cells Macrophages Endothelial Eosinophils NK Cancer

Growth/differ (w/SCF/FLT3L) Growth/differ/survival (w/SCF/FLT3L) Growth/activation/antitumor activity Activation Activation Growth/different/survival/memory/cytotoxicity Growth/antigen presentation Activation/proliferation Growth ICAM Growth Chemotaxis, superoxide, degranulation, hydrolase Chemotaxis Chemotaxis Chemotaxis/angiogenesis Chemotaxis Chemotaxis Autocrine growth/metastasis/angiogenesis

T cells (active) Fetal thymocytes Mast cells Pre erythroid B cells Lymphoma T cells NK Mono/macro Mast cells B cells

Growth (w/IL2), IL-22 Growth (w/IL2) Survival, growth (w/IL-3, IL-4), IL-22 Growth (w/erythropoietin) IgE Growth/survival ↓ Growth/IFNγ/cytotoxicity/chemotaxis. ↓ Cytotoxicity/IFNγ ↓ Activivity/IL12/AP/collagenase; ↑ TIMP Growth (w/IL-3, IL-4) Growth/differ/survival/MHCII (w/IL-2)

↓ Growth ↓ Growth Antigen presentation, especially self antigen

(continued)

158

Cytokines

Table 1. (continued) Cytokine

Cell source

Cells influenced

Effectb

Activated B cells Fibroblasts DC

Apoptosis ↓ Collagen/fibrosis ↓ Antigen presentation

IL-11

Monocytes Eosinophils Mast cells Keratinocyte Some tumors Stroma, marrow Fibroblasts Epithelial Chondrocytes Synovial Smooth muscle

Progenitor cells Megakaryocytes B cells Macrophages Th2 Fibroblasts Liver Synovial cells Osteoclasts NK CD8 T cells Th1 Th2 PBL TIL Macrophages B cell DC Mono/macro B cells Neutrophils NK Endothelial DC Th17 Epithelial Synovial Macrophages Renal ca B cells B cell lymphoma

Growth/colony formation Thrombopoiesis (w/IL-3) Growth ↓ IL-12 ↓ IL-4, IL-5, IL-13 ↓ Differ to adipocytes Acute phase proteins TIMP Growth/differentiation Growth/cytotoxicity/IFN (w/IL-1) Growth/cytotoxicity/IFN (w/IL-2) IFNγ, IL-2, growth ↓ IL-4, IL-10, growth LAK induction/CTL growth cytotoxicity Growth/cytotoxicity IFNγ Growth/differentiation (w/IL-2) Activation/antigen presentation, IFNγ ↓ Cytokines/NO/PGE2/CD14/ADCC ↑MHCII/CD11b c/IL-1RA/CD23 Growth/differ/Ig/IgE switching/CD23 ↑ IL1Ra, ↓ CD14 IFNγ, cytotoxicity VCAM/MCP-1/angiogenesis Growth/maturation,↓ IL-23, IL-1, IL-6. Suppression ↓ NO ↓ IL-1β, TNF ↓ HIV production ↓ Growth Growth/differentiation/memory Autocrine growth

T cells γδ T cells B cells NK LAK TIL Mast cells Keratinocyte CD4 T cells Mono/macro DC Eosinophils HIV NK

Growth/cytotoxicity/memory Growth/activation Growth/IgG, IgA, IgM Growth/cytotoxicity/chemotaxis Induction/cytotoxicity Growth Growth/response Growth; psoriasis Migration/growth w/IL-2, IL-15 Migration/activation/antigen presentation Migration/antigen presentation/tolerance (w/TPO) Migration ↓ Replication/↓entry Cytokines/migration

Macrophages Fibroblasts

Inflammatory cytokines, IL-10, IL-12. Inflammatory cytokines, GM-CSF

IL-12

B cells Macrophages DC Neutrophils Microglial Keratinocytes

IL-13

Th2 cells Mast cells Basophils Eosinophils DC Some B lines Tumor cells

IL-14

IL-15

IL-16

IL-17

CD8 T cells Th1, Th2 NKT cells Follicular DC B lymphoma Epithelial Stroma, marrow PBMC Fibroblasts Keratinocyte

CD8 T Macrophages CD4 T cells B cells Fibroblasts Eosinophils Mast cells DC (immature) Epithelial Brain Th17 Neutrophils

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Walter M. Lewko and Robert K. Oldham

159

Table 1. (continued) Cytokine

IL-17B IL-17C IL-17F

IL-18

IL-19 IL-20

Cell source

Cells influenced

Effectb

CD8+ T cells

Epithelial Endothelial Keratinocyte DC Chondrocytes Granulocytes Synoviocytes CH ovary cells Monocytes Osteoclasts Monocytes Neutrophils

Inflammatory cytokines Inflammatory cytokines Inflammatory cytokines, ICAM Maturation/cytokine production Inflammatory cytokines/MMP/NO Production (w/GM-CSF) IL-6, LIF Invasiveness Osteoclast differentiation Activation IL-1β, TNFα Migration (indirect effect)

Monocytes

IL-1β, TNFα.

Endothelial Bronchial epithelium

↓ Angiogenesis. ↑ IL-2, TGFβ, MCP-1 ICAM, IL-6, IL-8 (neutrophil recruitment)

Th1

(w/IL-2, IL-12) IFNγ, growth/differ/IL-2, FAS/apoptosis/escape, IL-13 IFNγ (w/IL-12), IgG (w/IL-2, IL-12) IFNγ, growth, anti tumor activity FAS/apoptosis/escape, IL-13 IFNγ (w/IL-2) IFNγ (w/IL-2) IL-4 Degranulation, cytokines, CD11b (complement R) Migration/regulation of angiogenesis Activation, IL-4 Activation, IL-6, TNF, ROS IL-10, IL-19 Proliferation, psoriatic character Proliferation bFGF, VEGF, IL-8, angiogenesis Inflammatory cytokines IL-6, IL-8 Proliferation, activity Proliferation, activity Inhibition Class switching, ↑IgG, ↓ IgE Regulation, ↓maturation, ↓activation Growth stimulation, inhibition, or no effect Acute phase proteins ↓ IL-4 Inflammatory cytokines Inflammatory cytokines, migration, β-Defensin Survival, acute phase proteins Proliferation IFNγ, Il-17, IL-6, IL-1, TNF, ICOS IL-12, IFNγ IFNγ Activation (IL-17) Proinflammatory, IL-6, TNF Differentiation, ↓Proliferation Proliferation ↓Growth, ↓migration, ↓angiogenesis TNF, IL-6 ↓Growth, ↑apoptosis, ↓angiogenesis, ↑radiosens ↓ Angiogenesis

Pancreas Intestine Stomach Prostate Fetal kidney CD4 T cells Monocytes Basophils Mast cells Macrophages DC Kupffer cells

B cells NK

Keratinocyte Airway epithelium Adrenal cortex

Macrophages DC NK T cells Neutrophils Endothelial Th2 Monocytes PBMC Keratinocyte Hemato progenitors Endothelium Synovial fibroblasts NK T cells, Th17 Treg B cells DC Hematopoietic tumor Liver Th2 Epithelium Keratinocytes Hepatocytes CD4+ T memory Th DC Macrophages Th17 PBL Melanocytes Keratinocytes Vasc sm muscle Monocytes Tumors

Monocytes Keratinocytes PBMC Keratinocytes Monocytes Glial cells

IL-21

Th2 Th17 Follicular T cells

IL-22

Th17 Mast cells Th1 Th2 NK DC Macrophages Keratinocytes

IL-23

IL-24

Th2 Monocytes (activ) Melanocytes PBMC (activ) Some tumor cells

Endothelium

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160

Cytokines

Table 1. (continued) Cytokine

Cell source

Cells influenced

Effectb

IL-25

Th2 Eosinophils Mast cells Microglial cells Basophils

Eosinophils Th2 Th17 Cartilage Fibroblasts (Lung) Epithelial cells

Growth, infiltration, ICAM, L-selectin, IL-6, IL-8, MCP-1, MIP-1α Activation (IL-4, IL-5, IL-13) Regulation Catabolism Inflammatory cytokines ICAM-1, IL-8, IL-10

T cells NK Th1 Th17 Granulocytes Macrophages Endothelium Most cells DC Tumor cells Th2 Myeloid progenitors Monocytes Epithelial cells Skin epithelium Lung epithelium Sensory neurons Monocytes/DC T cells

Proliferation, IL-12R, IFNγ IFNγ Differentiation, proliferation, activity ↓ Differentiation response to TFGβ/IL-6 ↓ ROS response to endotoxin ↓ ROS response to endotoxin ↓ Angiogenesis Antiviral, oligoadenylate synthetase, MHCI/II Maturation, Treg induction ↓Growth, ↑apoptosis, ↑ Immune response ↓ Activation (↓ IL-4, IL-5, IL-13) Survival Inflammatory cytokines Inflammatory cytokines Dermatitis EGF, VEGF, inflammatory cytokines Itching sensation, development TNFα, IL-1β, IL-6, IL-8, PGE2 Apoptosis, TNF

Th2 Mast cells Endothelium Fibroblasts, heart Cardiomyocytes nTreg CD4+CD25− Th17 cells CD8 T/CD4 Th1 CD4 Th2 Monocytes/macro B cells (active) NK/NKT DC T cells B cells B cells T cells γδT cells NK

Activation (IL-4. IL-5, IL-13) IL-8, IL-4, IL-5, IL-13, survival Nuclear protein/transcription repressor ↓ Collagen ↓ Hypertrophy Proliferation, IL-10 Suppression Suppression, ↓ IL-17 Proliferation/cytokines/↓ AICD/↓ apoptosis Suppression/anergy Activation/survival Proliferation/survival IFNγ/IL-2 IL-12/1l-6 ↓ Activation (by reverse signal) Differentiation (+/−), memory/apoptosis/AICD Activation/ab production (by reverse signal) Stimulate or inhibit, memory/apoptosis/AICD Activation/cytotoxicity (reverse signal) Activation/cytotoxicity (w/IL-2)

B cells Neutrophils T cells Thymocytes NK Mast cells

Memory/↓ class switching, Ig prod (by rev signal) Oxidative burst/IL-8 (by reverse signal) Proliferation/apoptosis/AICD, IL-6 (by rev signal) Apoptosis/negative selection Apoptosis/AICD Chemokines (rev signal)

IL-26 IL-27

T cells NK DC Monocytes (LPS) Macrophages

IL-28A, B, IL-29 IL-31

IL-32

IL-33

Monocytes Macrophages DC Th2

NK cells T cells Epithelium Monocytes Synoviocyte (RA) Endothelium Fibroblasts

IL-35

nTreg

4-1BBL

T Cells DC Monocytes/macro B cells Stromal cells Some tumor cells

CD27L

B cells T cells NK DC B cell malignancy Renal cancer cells Brain tumor Macrophages B cells T cells Megakaryocytes Neutrophils Eosinophils

CD30L

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Walter M. Lewko and Robert K. Oldham

161

Table 1. (continued) Cytokine

CD40L

FASL

FLT3L

Interferon γ

Cell source

Cells influenced

Effectb

pre-erythrocytes Some leukemias Some lymphomas CD4 CD8 Mast cells Basophils Fibroblasts Platelets

Eosinophils Lymphomas

Apoptosis Apoptosis/no effect/growth

B cells DC Macrophages T cells NK Fibroblasts

Proliferation/class switch/Ig/survival Activation/B7.1/B7.2/ICAM/IL-12, survival Activation/proinflammatory cytokines Costimulation/activation/growth/longevity. Activation/cytotoxicity Activation/proinflammatory cytokines/ICAM/ VCAM ICAM/VCAM/Angiogenesis factors IL-4 (by reverse signal) Activation/cytotoxicity (by reverse signal) RANTES/Inflammation Apoptosis/AP Apoptosis/AICD/Immune privilege Apoptosis/AICD/Immune privilege Apoptosis; chemotherapy response Damage (VLS) Apoptosis Growth/survival Growth/survival Growth/maturation (w/SCF, GM-CSF, IL-4, TNFα) Growth (w/IL-7, SCF) Growth of progenitors; response to IL-2 Differentiation Survival (w/NGF) Growth regulation Growth Growth (especially neural crest origin) MHCI/II, FcR, P1 Kinase, 2 -5 oligoadenylate synthetase Activation, H2O2 Cytotoxicity Altered Ig isotype secreted Inhibition of IL-4-induced functions Differentiation/cytotoxicity (w/IL-2) Growth/cytokine production ↓ Growth/cytokine production ↓ Differentiation ↓ Growth/angiogenesis ↓ Growth; increased differentiation ↑ MHC expression; ↓ NK sensitivity Differentiation Colitis; progression to colon cancer Development Growth/activation Implantation/trophoblast differentiation Survival/↓ maturation ↓ Growth↑ differentiation, ACTH secretion Differentiation/↓ growth Differentiation/↓ growth Growth (breast, colon, renal, prostate) ↓ Differentiation Proliferation, IL-2/IFNγ/IL-4/TNFα Costimulation for AP to T cells T cell help Proliferation Apoptosis

T cells B cells NK cells Some tumors DC (Immature) Hematopoietic Nonhematopoietic

Th1 CD8 T cells NK

Endothelium CD4 CD8 Platelets Some tumors T cells B cells Some tumors Endothelium Some tumors Hematopoietic SC Progenitor cells DC B cells NK/LAK Osteoclasts Neurons Neuron SC Some leukemias Some tumors Cells in general Macrophages NK B cells CD8 T cells Th1 Th2 Th17 Endothelium Tumor cells

LIF

Fibroblasts Endothelium Macrophages Epithelium, thymus Synoviocytes

LIGHT

T cells Granulocytes Monocytes DC (immature)

T cells Colon Mammary Osteoclasts Endometrium Neurons Corticotropes Myeloid leukemia Glioma Some carcinomas Embryonic SC T cells DC NK Hepatocytes HVEM+ LTβR+

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162

Cytokines

Table 1. (continued) Cytokine

Cell source

Lymphotoxin α (TNFβ)

Th1 CD8 T cells B cells (early) NK Astrocytes T cells B cells NK cells DC (Immature) LN cells Spleen cells

Lymphotoxin β

Novel Neurotrophin Oncostatin M

T cells Mono Neutrophils Certain tumors

Osteopontin

T cells Mono/Macro Osteoblasts Endothelium Some epithelial Brain Certain tumors

OX40L

DC B cell Endothelium T cells

RANKL

T cells B cells DC Stroma, BM

SCF

Stroma, BM Fibroblasts Liver Spleen Certain tumors

TNFα

Mono/macro T cells (active) NK Endothelial Mast cells Neutrophils Keratinocytes Adipocytes Pancreatic β Osteoblasts Astrocytes Neurons Adrenal cells

Cells influenced

Effectb

Some tumors B/T/DC etc. Endothelial NK T cells Osteoblasts Osteoclasts Lymphoid cells T cells B cells

Apoptosis Lymphoid organogenesis VCAM/ICAM Growth/development Growth/activation Growth/activation Lymphoid organogenesis Survival Survival

B cells Macrophages Neurons LN cells Fibroblasts Osteoclasts Vascular sm muscle Synoviocytes Some gliomas Sarcoma (Kaposi) Th DC Osteoclasts Osteoblasts Mono/macro Endothelial Epithelium, kidney Melanocytes CD4 T cells DC B cell Endothelial T cells DC T, B, DC etc. Preosteoclasts Mono B cells Stem cells Progenitor cells Mast cells γδ T cells Tumors

Growth/IgM/IgE/IgG Growth Survival/development T cell development/migration Growth/wound repair/collagen/fibrosis Growth/activation Growth/wound repair Inflammation regulation (+/−) Differentiation/↓ growth Growth Activation (favors Th1) Activation (favors Th1) Binding/recruit/remodel/↓Hydroxyapatite deposit Binding/remodeling/↓Hydroxyapatite deposit Chemotaxis/IL-1, TNF, IL8/↓ NO Survival/angiogenesis/↓ NO ↓ NO Survival Costimulation/IL-2/IL-4/IL-5/longevity/memory Maturation/TNF/IL-12/IL-1β/IL-6 (by back signal) Growth/differ (by back signal) Inflammation (by back signal) Leukemia (w/HTLV) Activation/AP/survival Lymphoid organogenesis Maturation; bone development Osteoclast differ (w/GM-CSF, TGFβ) B development; osteoclast development Growth Growth Growth/differentiation/survival/fibrosis Growth Growth (breast, lung, testicular, utererine, cervical, ovarian, melanoma) Growth/development (wIL-1)/IL-2/IFNγ Activation/Ig production NO/cytotoxicity NO/cytotox/IL-12/IL-10/apoptosis Growth/maturation (w/GM-CSF) Degranulation/complement R/ adhesion/ADCC/apoptasis Cytotoxicity Cytotoxicity Growth VCAM, damage, vascular leak syndrome Mitosis Activation

T cells B cells Endothelial Macrophages DC Neutrophils TIL LAK γδT cells Endothelial Osteoblasts Osteoclasts

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Walter M. Lewko and Robert K. Oldham

163

Table 1. (continued) Cytokine

TRAIL

Tweak

a b

Cell source

Cells influenced

Effectb

DC (Immature) Epithelial cells CD4 T cells NK cells Monocytes DC (Immature) Many cell types

Synovial Fibroblasts Tumor cells DC Autoimmune T cells Mast cells Fibroblasts Synoviocytes Bronch epithelium Macrophages Mesangial cells Astrocytes Keratinocytes Liver Endothelium Some tumors

Enzyme secretion Growth Apoptosis; apoptotic bodies for AP AP/T cell activation Apoptosis Apoptosis IL-8, IL-6, RANTES, IP-10 Inflammatory cytokines Inflammatory cytokines IL-6, MCP-1, IL-8, MMP-9 MCP-1, RANTES, IP-10, VCAM IL-8, IL-6, ICAM RANTES Proliferation Proliferation, ICAM, E-selectin, IL-8, angiogenesis Proliferation, survival

This is a partial listing that emphasizes cancer related activities. Activity increased unless otherwise indicated.

suppressors of cytokine signaling (SOCS) which are also referred to as cytokine-inducible suppressor proteins [332, 1882]. They act by binding Jak/STAT components, interfering with their binding to the receptor and their function [333, 492, 1882]. They are tightly regulated and required for normal lymphoid development [1882]. Various cytokines induce SOCS to regulate their own activities (a form of feedback inhibition) [1857] and the activities of other cytokines [428]. For example, SOCS may be increased by immune suppressor cytokines such as IL-10 [256]. Cytokines may act synergistically. For example, IL-18 and IL-12 are synergistic in the way they induce IFN-γ secretion. Synergism may be explained in a number of ways, but frequently, it is due to the upregulation of one cytokine’s receptor or its signaling pathway by the other cytokine [521, 965, 1724, 2214, 2253].

Toll-Like Receptors and the Response to LPS There is a family of receptors, molecularly related to cytokine receptors, called the pattern recognition receptors [520, 1089]. They are better known as the Toll-like receptors (TLR) for their genetic similarity to an important class of Drosophila morphogenesis genes. In addition to their role in fruit fly embryogenesis, Toll also has an antifungal immune function in the adult flies [1089]. These receptors have the important role of sensing the

presence of microbial invaders and initiating immune response. They do this by specifically binding molecules (danger signals) shed from microbes, collectively called pathogen-associated molecular patterns (PAMPs) [1282, 1654]. Bacterial lipopolysaccharide (LPS) (endotoxin) is a well-studied PAMP. LPS is a major cell surface component of Gram-negative bacteria. It binds TLR on macrophages, endothelial cells and dendritic cells where it is a potent activator and stimulator of cytokine production [1983, 2081]. Activation may be very vigorous. LPS induces toxic shock syndrome [1629]. Knockout gene studies in mice have shown that TLR4 recognizes LPS whereas TLR2 is essential for response to several gram positive PAMPs [1586, 1956]. There are at least six human Toll-like receptors. They are integral membrane proteins. The intracellular region is homologous with the signaling domain of the IL-1 receptor family [1303]. TLR signaling activates several cells that are important in immune response [516, 2081]. Immature dendritic cells contain these receptors. Binding LPS induces DC activation, maturation and secretion of cytokines such as IL-12, allowing antigen presentation to occur. Toll receptors are an important bridge between the innate and specific immune response systems.

The Helper T Cell System Mosmann and coworkers proposed a paradigm for the differentiation of CD4+ helper T (Th) cells, cytokines secreted and their roles in regulating of the development

164 of cellular versus humoral immunity [1375, 1376, 1659, 1709, 1937]. This paradigm has been expanded to include additional cells and newly discovered cytokines. The following is a very brief summary of an involved system. A model for the differentiation of Th1 and Th2 helper T cells is shown in Fig. 1. Thp cells are naive precursors to helper cells; IL-2 is the major cytokine they produce. Antigen presentation stimulates their conversion to Th0, the intermediate precursor cells. Th0 cells secrete IL-2, IL-4 and IFN-γ [1314, 1376]. Depending on environmental conditions, Th0 cells differentiate into Th1, Th2, Th17 and regulatory T cells. This process is commonly referred to as polarization; the cells become polarized to secrete specific cytokines and perform certain functions. Th1 cells favor the development of cellular immunity. Intracellular microbes (such as viruses) are eliminated by this path. Cancer cells are also killed by cellular immune response. Th1 responses are important in delayed type hypersensitivity and in certain autoimmune diseases. Th1 cells secrete several cytokines, among them INF-γ, IL-2 and TNF-β, which are collectively referred to as Th1 cytokines. In particular, IFN-γ is considered a key marker for Th1 response. IL-12 and IL-2 favor the Th1 path. IL-4, a product of Th2 cells, generally inhibits the Th1 path. Th2 cells favor the development of humoral immunity. Th2 response also stimulates eosinophil recruitment and macrophage function. This path eliminates extracellular microbes and large parasites. Th2 responses are important in infectious diseases and in allergy. Th2 cells secrete IL-4, IL-5, IL-6, IL-9 and IL-13. IL-4 is the hallmark Th2 cytokine. Mouse Th2 cells secrete IL-10. (In humans, both Th1 and Th2 cells produce IL-10). IL-4 stimulates the Th2 path whereas IFN-γ, a major Th1 cytokine, inhibits it [2, 1746]. In addition to cytokines, there are further influences that fine tune Th1 versus

Figure 1. Differentiation of Th1 and Th2 helper T cells. Antigen presentation (AP) stimulates the conversion of naive precursor Thp cells to immediate precursor Th0 cells. Th1 cells favor the development of cellular immunity and response to intracellular microbes. Th2 cells foster humoral immunity and response to extracellular microbes and parasites. The major positive and negative stimulators of each path are indicated. Cytokines within the boxes are produced by the indicated cells. IL-10 is a Th2 cytokine for mouse cells; in humans, both Th1 and Th2 cells produce IL-10

Cytokines Th2 path selection. (a) Antigen dose; generally, low antigen dose favors the Th1 path, while higher antigen dose favors Th2 cells [798]. (b) Route of antigen administration [1993]. (c) Type of antigen presenting cell [1775]. (d) Type of costimulation: during antigen presentation, B7.2 favors Th2 [565]. Th17 cells induce inflammation. This path responds to extracellular microbes. Th17 cells have important roles in autoimmunity. Th17 cells secrete IL-17A, IL-17F, IL-21, IL-22, IL-6 and TNF-α. TGF-β and IL-6 induce differentiation of Th17 cells; IL-23 maintains and stimulates cytokine production. IL-2 and IL-13 inhibit Th17 cells [55, 869]. Regulatory T cells (Treg) are defined functionally by their suppressive effects on immune response, inflammation and autoimmunity. Tregs are the subject of intense research; they have important roles in the cause and prevention of diseases including cancer. Many types of cells show regulatory character. Here we will mention three major types. Th3 cells secrete the immunosuppressive cytokine TGF-β. Tr1 cells produce immunosuppressive IL-10. Natural Treg cells have the phenotype CD4+ CD25+ Foxp3+. IL-2 and TGF-β induce nTreg cells. The nTreg mechanism of suppression involves cell contact (cell surface receptors) and possibly the secretion of immunosuppressive IL-10 and TGF-β [1714, 2002]. Polarization is not limited to Th cells. Based on the cytokines secreted, NK cells [285], cytotoxic CD8 T cells [251, 1708], macrophages [1313] and dendritic cells [1206, 1596, 1647] may develop type 1, type 2 and regulatory cell profiles. Imbalance in type cells (exaggerated polarization/cytokine secretion) appears to drive development of diseases including autoimmunity (exaggerated Th1 or Th17) [6, 290], allergy (exaggerated Th2) [923, 1101], and cancer (Treg) [1590, 2056].

IL-12 + IL-4 -

Thp

AP

IL-13 IL-17

Th0 IFNγγ -

IL-2

IFNγ IL-2 TNF

Th1

IL-2 IL-4 IFNγ IL-13

IL-4 + OX40 + B7.2 +

Th2

IL-4 IL-5 IL-6 IL-9 IL-10 IL-13

Walter M. Lewko and Robert K. Oldham

Antigen Presentation; Dendritic Cells T-cells and B-cells do not typically respond to antigens directly, rather a family of cells referred to as professional antigen presenting (AP) cells make the presence of an antigen known to these effectors in a complex and highly regulated process referred to as antigen presentation [1159, 1888]. Dendritic cells (DC), macrophages, B cells, Langerhans’ cells, and eosinophils are antigen presenting cells. These cells have the necessary ability to migrate (between tissues and lymphnodes), they contain the appropriate antigen processing machinery (antigen is broken down to small peptides in the process) and surface binding proteins (including MHC to display antigen peptides) to help insure that an effective and safe immune response occurs. AP cells also have the necessary costimulatory molecules such as CD80 (B7.1) and CD86 (B7.2). Among the AP cells, dendritic cells are particularly good at inducing specific T cells with anticancer and antiviral activity. Different subpopulations of AP cells may favor different types of immune response (e.g. Th1 vs. Th2) [1595, 1596]. Cytokines control the proliferation and development of AP cells. AP cells are also a source of cytokines which influence innate as well acquired immunity. Abnormalities in antigen presentation may result in autoimmune disease or, in the opposite extreme, a failure to mount any immune response at all.

Tumor Necrosis Factor Family of Cytokines Tumor necrosis factor (TNF) was originally discovered as a component of blood, produced by host cells in response to infection and bacterial products such as LPS [150, 151, 152, 250, 1471]. A number of related factors turned up [6, 150, 657, 685]. Now it is known that TNF (now called TNF-α) is the founding member of a family of at least 19 cytokines and related virus proteins. The members of the TNF family are involved in cell growth, differentiation, inflammation, wound repair, costimulation of immune response and the regulation of cell death. There is homology in amino acid sequence among most TNF family members, though it is not particularly high [685]. Nerve growth factor (NGF) is not homologous but its receptor is related to the TNF receptor. TNF-β and NGF are soluble cytokines. TNF-α and TWEAK are mostly soluble, partly membrane bound. The remaining TNF family members are membrane-

165 bound proteins [685]. The active, receptor binding form of most TNF family members is a trimer. These trimers induce receptor clustering and signal transduction [75]. Membrane-bound TNF family members act by direct contact between the cytokine bearing cells and receptor bearing target cells. Certain membrane-bound cytokines, upon engaging receptor, may signal back (reverse signaling) inducing effects in the parental cell; where reverse signaling occurs, both cells are, at the same time, targets and effectors. TNF family members bind receptors that are related molecularly. They are transmembrane glycoproteins. Some TNF family receptors have soluble/shed forms that are the result of proteolytic cleavage or alternative mRNA splicing. The amino acid identity between the human receptors is in the range of 25–35%. The extracellular regions characteristically have three to six copies of cysteine-rich pseudo repeats, each containing six cysteines in a segment of about 40 amino acids. The cytoplasmic region of certain receptors contains a conserved “death domain,” involved in apoptosis (e.g. TNFRI, Fas, DR3, DR4, DR5). There are intracellular receptor associated proteins such as TRAF (TNFRassociated factors), TRADD (TNFR1-associated death domain protein), and RIP (receptor interacting protein) which bind and communicate between the TNF receptor family members to regulate apoptosis and other cytokine responses [2137]. Members of the TNFR family share these intracellular signaling proteins to activate similar transduction pathways. Certain members of the TNF receptor family are found in many types of cells (TNFRI, TNFRII, Fas, Fn14) whereas others are restricted to hematopoietic cells (CD27, CD30, CD40, HVEM, OX40, 4-1BB) or specific tissues (nerve growth factor receptor) [75, 2137].

Interleukin-1 Inflammation, Immune Regulation, Hematopoiesis, and Wound Repair IL-1 was originally called lymphocyte activating factor for its effects on mitogen-treated thymus cells [617]. It has also been called leukocyte pyrogen and endogenous pyrogen, for its fever inducing effects [436, 1401]. Monocytes, macrophages, keratinocytes, T cells, B cells, NK cells, eosinophils, dendritic cells, fibroblasts, epithelial cells, endothelial cells, neurons, glial cells and astrocytes produce IL-1 [551, 1170, 1735, 1972, 2140]. IL-1 is involved in inflammation, hematopoiesis, immune regulation, wound healing and metabolic regulation.

166 It is responsible for, or at least involved in, a number of inflammatory diseases. IL-1 also appears to influence cancer growth and metastasis. The IL-1 gene family has three main members: IL-1α, IL-1β and IL-1 receptor antagonist (IL-1Ra). IL-1α and IL-1β are synthesized by separate, distantly related genes [1225, 1500]. The proteins have 26% homology. Both cytokines are synthesized as 31,000 kDa pro-IL-1 molecules. They lack the usual signal peptides characteristic of most secreted proteins. Pro-IL-1α and the processed 17,000 mw product are both active cytokines. Newly synthesized IL-1α accumulates within the cytosol. Not much IL-1α is secreted. Intracellular IL-1 may serve an autocrine function in endothelial cells, keratinocytes and fibroblasts. Pro-IL-1α is found on the cell surface, associated with lectin; bound IL-1α has cytokine activity [201]. Pro-IL-1β is inactive. It is processed to a 17,000 mw form, which is functional and the major secreted form of IL-1. Processing is carried out by the protease, IL-1β converting enzyme (ICE, caspase 1) [68, 160, 272, 299, 1992]. ICE is involved in the processing of other cytokines (IL-16 and IL-18), but not IL-1α, which is cleaved by another protease. mRNA synthesis and posttranslational processing control the production of IL-1β. Bacterial products (LPS), TNF-α, IL-1 itself, and the immunostimulatory drug OK-432 stimulate IL-1β secretion by blood monocytes and other cells [782, 971, 435, 437]. Extracellular ATP triggers activation of ICE and a burst of IL-1β secretion [529, 528, 1557]. ATP is a signal that is released by activated lymphocytes and from damaged cells [782, 1925]. IL-1Ra is an inhibitor of IL-1. It competes with IL-1 for its receptor [454, 482, 658, 723]. Secretion of Il-1Ra generally follows IL-1 production. In patients and in cultures of human PBMC, IL-1Ra secretion is stimulated by IFN-α, IL-4 and to a lesser extent by IFN-γ [1997]. Patients treated with IL-1 had increased serum IL-1Ra and with time the antagonist remained measurable after IL-1 was no longer detected [1007]. There are two receptors for IL-1, IL-1RI that is responsible for activity and IL-1RII that is a regulatory decoy receptor. They are distinct membrane bound proteins, produced by separate genes [310, 1829]. The active signaling complex contains several components. IL-1 binds the IL-1RI. IL-1 receptor accessory protein (IL-1RAcP) binds and enhances affinity for IL-1; it is required for signal transduction [663, 1008, 2144]. MyD88 is an adapter protein that joins the complex [2145]. IL-1R associated kinase (IL-1RAK) then binds; the kinase is phosphorylated and activated [354].

Cytokines Then TNFR-associated factor-6 (TRAF-6) binds. Now this multicomponent receptor complex is functional and it induces the activation of transcription factors, in particular NF-κB, which translocates to the nucleus, binds DNA response elements and induces the production of mRNA’s responsible for IL-1 effects [243, 354, 1008]. The second receptor, IL-1RII binds IL-1 but cannot signal due to the lack of a binding site for MyD88. There is a soluble form of RII, which is found in tissue fluids; it is increased during inflammation [628, 1593, 1938]. Soluble receptor II may be generated by proteolytic cleavage [1506] or by alternative mRNA splicing [1136]. The cellular form of RII binds IL-1α, IL-1β and IL-1Ra; soluble RII binds IL-1α and IL-1β but not IL-1Ra [65]. RII appears to function as a competitive decoy for IL-1 [334, 1446, 1621] and IL-1RAcP [1056] available to bind IL-1RI. The biological properties of IL-1 are far reaching and complex; it is often referred to as a two edge sword. On one hand IL-1 functions in hematopoiesis, the regulation of metabolism, wound healing and the control of infection. On the other hand, IL-1 appears to be involved in the debilitating effects of several inflammatory diseases and septicemia [846, 1482]. IL-1 has a remarkable effect on hematopoiesis. In early progenitor cells, IL-1 is survival factor; it protects stem cells from environmental insults, cytotoxic chemicals, radiation and the like. IL-1 also primes progenitor cells for outgrowth, by placing them in the G0-G1 stage. IL-1 by itself does not induce outgrowth [191, 530, 1442, 1501, 1762]. IL-1 increases IL-3, G-CSF, M-CSF and GM-CSF; together with these cytokines, IL-1 synergistically stimulates the expansion of specific cell lineages [100, 1329, 1349, 2306, 2309]. Patient treatment with moderate doses of IL-1 caused elevated neutrophil and platelet levels [1842]. Interestingly, prolonged treatment and higher doses caused an apparent decrease in neutrophils, platelets and erythrocytes. There are two possible explanations for this decrease: First, IL-1 induces TNF and TNF has a depressive effect on hematopoiesis [594, 845, 898]. Second, IL-1 induces adhesion molecules on capillary endothelial cells. Studies in culture showed that endothelial cells with elevated adhesion molecules bind a number of different types of cells; these cells may be sequestered in the capillary bed resulting in an apparent decrease in cell numbers [406, 1380, 1681]. IL-1 stimulates dendritic cells. It acts together with GM-CSF to promote maturation [744]. Dendritic cells have an important function as antigen presenting cells in the development of lymphocytes. T cells and B cells synthesize IL-1 and have the IL-1 receptor [1163, 1504].

Walter M. Lewko and Robert K. Oldham IL-1 stimulated T cells, induced IL-2 production, IL-2 receptors and cytokine production; IL-2R induction appeared to be a key step [940, 1039, 1827]. Immature T cells appeared to require IL-1 in order to synthesize IL-2; IL-6 acts synergistically with IL-1 in T-cell maturation and the production of IL-2 [1686]. In more mature T cells, IL-1 favored Th2 cells. It stimulates the proliferation of Th2 cells and the production of IL-4, IL-5 and IL-6. IL-1 had no apparent effect on Th1 cells. IL-1 also acts as a chemoattractant for T cells and it stimulates production of IL-8 [822, 1039, 1335]. In B cells, IL-1 acts together with B cell growth and differentiation factors IL-4, IL-6 and IL-2 to stimulate growth and the production of immunoglobulin. IL-1 increases the levels of glucocorticoids. Glucocorticoids stimulate B cell IL-1 receptors. Glucocorticoids and IL-1 together stimulate antibody production [14]. In natural killer cells, IL-1 and IL-12 together stimulated the secretion of IFN-γ in response to infection [824]. The activities of IL-1, TNF and IL-6 are interrelated. IL-1 and TNF have similar biological properties and their combined effects are usually synergistic [1216, 2093]. IL-1 induces TNF production [1077, 2173] and TNF induces IL-1 production [197, 435]. The receptors for IL-1 and TNF share a common accessory protein and signaling path. As part of a regulatory loop, IL-1 tends to depress TNF receptors [788, 2093]. In mice IL-1 induced IL-6 production. Blocking IL-1 by IL-1Ra depressed IL-6 levels and inflammation [616, 1090]. TNF stimulates both IL-1β and IL-6 [550]. IL-6 regulates IL-1 activity by increasing IL-1Ra levels [1749] and by decreasing IL-1 formation [1742]. IL-1 stimulated mast cell production of IL-3, IL-4, IL-5, IL-6, IL-9 and TNF. Thus, IL-1 may enhance Th2related events including humoral response and allergic inflammation. IL-1 may also influence the natural response of mast cells to parasites, viral infection [820] and cancer. The nervous system has receptors for IL-1 and brain cells are capable of IL-1 production [196, 1072]. IL-1β is secreted by microglial cells in response to brain trauma. IL-1 induces production of nerve growth factor [1873] and ciliary neurotrophic factor [742], which are involved in nerve cell survival and wound repair. In this way IL-1 released during brain inflammation may have a beneficial effect on CNS regeneration [742]. IL-1 treated patients often suffer from sleepiness, fever and lack of interest in eating. IL-1 activity in the nervous system appears to be involved. IL-1 injections in animals induced slow wave sleep and depressed rapid eye movement [1815]. IL-1 induces fever. There are several other cytokines capable of doing so including TNF, IL-6

167 and IFN-α. IL-1 increases IL-6 levels; blocking IL-1 activity lowered IL-6 and depressed fever [327, 616, 2277]. IL-1 also induces anorexia in animals. The mechanism appears to involve increased brain cyclooxygenase and prostaglandin production [733]. IL-1 has several effects on metabolism. It interacts closely with a number of hormones, in particular the glucocorticoids and insulin. IL-1 influences the brainpituitary-adrenal axis. IL-1, injected i.v., increased the release of corticotropin releasing hormone and ACTH as well as endorphins, vasopressin and somatostatin. Glucocorticoid levels increased in response to injected IL-1 and during stress and trauma [1639, 1812]. Glucocorticoids influence metabolism throughout the body; hydrocortisone feeds back on the production of IL-1 [144, 148, 410, 1080]. In this way glucocorticoids appear to regulate inflammatory response. IL-1 promotes bone resorption and cartilage degradation [424]. It induces the release of collagenase, phospholipase A and prostaglandin E2 from synovial cells [154, 1326, 2304]. IL-1 altered the production of several liver proteins; fibrinogen, clotting factors, metallothionein and complement were increased. Albumin, transferrin and lipoprotein lipase were decreased. Negative nitrogen balance in muscle protein is associated with inflammatory diseases. IL-1, IL-6, TNF and insulin are involved. Pancreatic β islet cells have IL-1 receptors [706]. Both IL-1 and IL-6 stimulate production of insulin [2182]. IL-1 and IL-6 together with TNF have insulin-like effects on metabolism. In rats treated with endotoxin, for example, IL-1 blockade using IL-1Ra spared muscle protein [2272]. IL-1 stimulates the growth of several different types of cells including keratinocytes, smooth muscle cells, glial cells, mesangial cells and fibroblasts [996, 1126]. In this way, IL-1 has a role in wound repair and angiogenesis. In fibroblasts, IL-1 increased proliferation [1744] and the uptake of glucose [156]. IL-1 also stimulates collagen production by fibroblasts and epithelial cells. Tissue fibrosis is associated with inflammatory disease; it appears to be related to paracrine and autocrine IL-1 secretion. In cultured fibrotic kidney cells, IL-1 blockade using IL-1Ra depressed fibroblast proliferation [1150]. There are interesting relationships between IL-1 and endotoxin. IL-1 is one of several cytokines (IL-2, IL-15, IFN-γ and TNF-α), which stimulate Toll-like receptor (TLR) levels in macrophages [1247]. TLRs bind microbial products and stimulate innate immunity and inflammatory responses to pathogens. Endotoxin and IL-1 have similar biological properties including the induction of IL-1 and TNF levels. Interestingly, TLR and the

168 IL-1R have homologous intracellular signaling domains. Activation of these receptors brings about similar proinflammatory responses [164]. IL-1 is involved in several inflammatory diseases. In the intestine, IL-1 and TNF are produced by epithelial cells and appear to prevent microbial invasion. In inflammatory bowel disease, these cytokines were increased. Somatostatin inhibited basal IL-1β production and prevented induction by TNF and bacteria. These results suggested that somatostatin regulates IL-1 and may have a role in prevention of bowel inflammation [314]. In patients with rheumatoid arthritis, synovial tissues produce IL-1 [538] and the levels of IL-1 are elevated in plasma. IL-1 is a chemotactic factor for neutrophils [1732]; IL-1 induces nitric oxide synthetase and the production of nitric oxide, which mediates many inflammatory processes [504]. IL-1 also induces cyclooxygenase II and the production of prostaglandins, which have inflammatory effects [1217, 1360]. IL-1 directly stimulated levels of the proteolytic enzymes involved in joint destruction, collagenase, tissue plasminogen activator, and stromelysin [424, 1403]. In chondrocytes, chronic IL-1 inhibited proliferation and the production of collagen and proteoglycan [1156, 1885, 1968]. IL-1 and tumor necrosis factor act mutually to stimulate joint inflammation [197, 2173]. Clinical and animal studies have shown that therapies blocking TNF-α activity were beneficial. In mice with collagen-induced arthritis, anti-IL-1 antibodies and antibodies to the IL-1 receptor [607, 901, 2055, 2173] reduced the severity of the disease. Blocking both IL-1 and TNF-α had an additive effect [2173]. IL-1Ra and IL-1 RII are being studied clinically to see if they are of benefit in treating inflammatory diseases. In patients with rheumatoid arthritis, rhIL-1Ra reduced the progression of joint erosion [199]. Unfortunately, rhIL1Ra did not significantly increase survival in patients with severe sepsis [1499]. In patients with arthritis, exercise has a beneficial effect on joints. A biochemical rationale was provided in an interestingly cell culture model for physical therapy. Cyclic tensile strain on cultured chondrocytes decreased the effects of IL-1β by interfering with IL-1 receptor signaling. Markers for inflammation were decreased and the extracellular matrix was restored [2217]. IFN is used to treat viral hepatitis. However, 60% of patients do not respond well. IL-1 may be a reason for this lack of response. IL-1β appears to depress the antiviral activity of type I interferon [1994]. When mice were injected with IL-1β, liver cell antiviral response was depressed. IL-1 appeared to interfere with IFN signaling at the level of STAT 1 phosphorylation. It is

Cytokines possible that IL-1 blockade may be a way to intensify IFN response in the treatment of viral disease [1994] and possibly cancer. IL-1 is of interest in the treatment of cancer [1838]. In culture, IL-1 has a direct inhibitory effect on the growth of several types of human cancer cell lines [378, 959, 1498]. In animal studies, intratumoral treatment with IL-1 induced regression of injected tumors but not distant metastases [1418]. Fibrosarcoma cells expressing cell surface IL-1α, implanted in mice showed decreased growth and induced protective immunity [1858]. While preclinical studies showed promise, little or no benefit has been observed using IL-1 in patients with melanoma [1879] or renal cancer [1625]. The combination of IL-1 with IL-2 was explored in clinical trials. Increases in NK and LAK activity were observed and there were some responses in patients with colon cancer, melanoma and renal cancer [2026]. IL-1 has also been tested in combination with chemotherapy to enhance drug effectiveness and decrease blood cell suppression. IL-1 decreases the activity of drug metabolizing cytochrome P-450 [619]. In cultured cells, IL-1 had synergistic effects with certain forms of chemotherapy [1417, 2046]. Similar synergistic effects of IL-1 and chemotherapy were seen in animal tumor models [897, 1051]. Thus far the results in clinical trials have been rather disappointing. In ovarian cancer patients treated with carboplatin and in osteosarcoma patients treated with etoposide, the addition of IL-1 resulted in very modest increases in antitumor response [2072, 2199]. In preclinical studies, IL-1 offered some protection to progenitor hematopoietic cells undergoing irradiation or treatment with cytotoxic drugs [191, 1441, 1495, 1762]. When cancer patients were given IL-1 in phase 1 clinical trials, granulocytes and platelets were stimulated showing that IL-1 could be beneficial for blood cell recovery [357, 1842]. In children on chemotherapy (Ifosfamide-Carboplatin-Etoposide), unfortunately, treatment with IL-1α produced no significant hematoprotective benefit [576]. IL-1 produces significant though manageable side effects. Low dose IL-1 causes headache, myalgia, arthralgia, sleepiness and anorexia. Higher doses cause a rapid loss in blood pressure. These symptoms mimic septic shock. Highest doses produced grade IV hypotension and neurological signs [1842]. In summary, IL-1 stimulates T cells, B cells and hematopoiesis. Undoubtedly, it has a role in the development of immunity. But at present its toxicity and modest antitumor effects preclude approval for use in cancer patients. There is evidence that IL-1 stimulates the growth of certain types of cancer. In patients with chronic myelogenous leukemia, Il-1β levels were elevated and blocking

Walter M. Lewko and Robert K. Oldham IL-1 depressed cancer cell growth; IL-1 was determined to be a negative prognostic factor [2148]. IL-1 is an autocrine growth stimulator for certain human gastric cancers [864]. In capillary endothelial cells, IL-1 increased cell surface adhesion molecules and the binding of tumor cells [406]. Pretreatment of mice with IL-1 increased the metastasis of B16 [2074] and human melanoma cells [620]. When the mice were treated with IL-1Ra, there were fewer metastases, smaller metastases and the animals lived longer [620]. Perhaps therapies aimed at blocking IL-1 may be beneficial in controlling the growth and spread of certain cancers.

Interleukin-2 Growth And Activation of T, B and NK Cells; Activation-Induced Cell Death; Elimination of Self-Reactive T Cells IL-2 was originally described as a factor in the conditioned medium of mixed lymphocyte cultures that stimulated T cell growth [643, 936]. The following is a brief review of this very well studied cytokine. The early work is covered in greater depth in prior editions of this book [1110]. IL-2 is a member of the helical cytokine family, which includes IL-2, IL-4, IL-7 and IL-15 [1963]. IL-2 is produced mainly by T cells. Activated cytotoxic T cells, Th0 and Th1 cells secrete IL-2 but Th2 cells do not [1040, 1798]. Initial studies used natural IL-2 prepared from lymphoid cells [561, 1305, 1649, 2141]. It is a 133 amino acid glycoprotein with variable molecular weight due to the carbohydrate. The gene for IL-2 has since been cloned [1666, 1963]. The recombinant protein made in bacteria lacks carbohydrate. Certain forms of recombinant IL-2 have an amino acid change to facilitate production [210]. Recombinant IL-2 and the natural product have similar biological activities and stabilities [1663]. Both forms of IL-2 have relatively short half-lives of 1–2 h following intravenous injection [696, 1158, 1160] and 4 h following bolus sc injection [696]. IL-2 loss is mainly by renal clearance rather than hepatic metabolism or target cell binding [448]. Intraperitoneal injection has been used to treat abdominal malignancies. Injection i.p. produces sustained, locally high levels of IL-2; systemic toxicity is lower. Sometimes, repeat i.p. injections induced fibrosis, likely due to the release of secondary cytokines such as PDGF or TNF-α [145, 1091, 2044]. IL-2 has also been delivered by inhalation [818] or and by mini-osmotic pumps [1458].

169 The IL-2 receptor is composed of three subunits: IL2Rα, IL2Rβ and IL2Rγ (also called γC, common γ subunit). The α subunit has high affinity for IL-2. The β and γ chains are involved in signaling [968, 1002, 1097, 1823]. The three subunit complex exhibits highest affinity for IL-2 (Kd 10−10 M). In NK cells, the IL-2R is in the form of a βγ dimer; this two-subunit receptor has moderate affinity (Kd 10−9 M) and requires higher IL-2 concentrations to produce effects [734, 945, 1024, 1508, 1823]. Janus kinase activity is associated with the γ chain. The receptor complex is activated by phosphorylation. A major signal path involves the STAT transcription factors (signal transducer and activator of transcription), which bind to the activated receptor complex and are in turn activated by phosphorylation. The activated STATs translocate to the nucleus, bind an array of gene promoters and initiate transcription associated with IL-2 response. Immune suppressive drugs FK406 and Cyclosporin A act at the level of transcription factors, which are activated by IL-2 and other cytokines [491, 544, 656, 1262, 1263]. A peptide has been produced which comprises amino acids 1–30 of human IL-2. It forms a tetrameric structure that binds IL-2R β dimers. The peptide is an IL-2 agonist: it induces activation of CD8+ T cells and lymphokine-activated killer (LAK). Interestingly, it acts synergistically with IL-4, IL-9, IL-15 and with IL-2 itself. This peptide may have therapeutic potential [476, 477]. IL-2 was originally discovered by its capacity to stimulate proliferation in T cells. T cells produce IL-2 and it stimulates T cell growth. A defect in IL-2 production appears responsible for a type of severe combined immunodeficiency disease [2135]. IL-2−/− knockout mice have been developed which lack IL-2. In initial studies, proliferation response was weak in Con A or anti-CD3 Mab activated mononuclear leukocytes; otherwise the mice appeared rather normal [1754]. Further studies showed IL-2 −/− mice had increased autoimmune disease, ulcerative colitis, inflammatory bowel disease, anemia, progressive loss of B cells and altered bone marrow cell profiles [1185, 1710, 1711]. The animals suffered from uncontrolled T cell proliferation, apparently due to a defect in Fas-induced apoptosis [990, 1092]. Related observations have been made in mice lacking the IL-2 receptor α chain [2168] and β chain [1933]. In germfree IL-2 −/− mice, autoimmune disease developed but not colitis, which appeared to require enteric microbial antigen [341]. Interestingly, allograft rejection still occurred, not only in IL-2 −/− knockout mice [1886] but also in IL-2 −/− IL-4 −/− double knockout mice [1119]. These results suggested IL-2 is not an

170 absolute requirement for rejection. Other cytokines such as IL-7, IL-12, IL-15 or IL-21 may provide redundancy in certain IL-2 functions [1886]. Nonetheless, IL-2 appears necessary for the normal regulation of T-cell growth and involution. In particular, IL-2 has a role in tolerance by inducing T cell suicide [1706, 1933, 2168], in activation-induced T cell death [1092, 1626, 2062] and it is involved in the inhibition of T cell memory maintenance [1026]. Further, IL-2 induces regulatory T cells (Treg: Foxp3+ CD4+ CD25+), which are antigen specific cells that regulate immune response. In particular, they suppress effector T cells, which are self-antigen specific and autoimmunogenic. In many cancer patients, these regulatory T cells are enriched in the tumors and blood. Since many tumor antigens are essentially overexpressed self antigens, Treg cells may have a role in tumor immune escape and poor response to cancer biotherapy [165, 1309, 1806]. IL-2 stimulates cytotoxicity in NK cells [734, 1386, 1387], thymocytes [1800] and in cytotoxic T lymphocytes (CTL) [1799]. Peripheral blood lymphocytes treated with IL-2 generate LAK cells [176, 444]. Cytotoxic NK cells make up the major active component of LAK [1507, 1567, 1995, 2133]. NK cells lyse tumor cells by membrane channel forming perforin, granzymes and receptor mediated cell death by apoptosis. IL-2 also enhances antibody dependent cellular cytotoxicity (ADCC) mediated by lymphocytes against tumor cells [1810]. IL-2 stimulates B cell growth, differentiation and the production of Ig. IL-2 acts alone and together with other B cell stimulating cytokines such as IL-6 [886, 1419, 1872]. IL-2 also activates production of several cytokines including the interferons, tumor necrosis factor α (cachectin) and tumor necrosis factor β (lymphotoxin) [478, 611, 1016, 1599]. In this way IL-2 may induces a cascade of effects influencing immune response. Many tumor cell lines express the IL-2 receptor. Some of these cells respond directly to added IL-2 with decreased growth. Interestingly, IL-2 sometimes down regulates surface molecules such as ICAM and MHC, which are involved in antitumor immune response [2234]. Denileukin diftitox (ONTAK) is a recombinant cytotoxic chimeric protein composes of active domains of diphtheria toxin fused with the receptor-binding domain of IL-2. It binds to cells expressing the IL-2R, is internalized and kills susceptible cells. ONTAK has been approved for use in cutaneous T cell lymphoma and is being tested in other hematologic malignancies. It is also being studied as a means of controlling regulatory T cells in cancer patients [86, 380].

Cytokines IL-2 is used to treat renal cell carcinoma and melanoma patients [190, 1674, 1675, 2146]. Its effects generally appear due to T cells and NK cells. Response rates were related to IL-2 dose. Most patients tolerate IL-2, but in addition to the usual flu-like discomforts associated with cytokine therapy, high dose IL-2 induced hypotension and vascular leak syndrome (VLS) which may be life threatening [106, 1676]. VLS is due to capillary endothelial cell damage. Possible sources of damage include cytotoxic lymphocytes, neutrophils [717], complement [1982], TNF [458, 1607] and inflammatory factors such as histamine, serotonin and bradykinin [1211]. Toxicity may be due to IL-2-induced IL-1. In a phase I trial, cancer patients were treated with soluble IL-1 receptor, an antagonist, in an attempt to lessen IL-2 toxicity [1266]. Unfortunately, soluble IL-1R provided no benefit. The evidence for cytotoxic lymphocyte involvement is rather strong. Immune suppressive agents including IL-10 (discussed later) [1676, 1115] and inhibitors of immune cell outgrowth [1606] depress VLS. IL-2-induced LAK cells adhere to endothelial cells and kill them [375]. Blocking the binding of leukocytes to capillary endothelium [1481] and depletion of NK cells [1547] ameliorate VLS. Finally, IL-2-induced endothelial cell damage is significantly lower in mice, which are defective for perforin or Fas ligand (discussed later), both involved in lymphocyte-mediated cytotoxicity [1612]. IL-2 has been used ex vivo to stimulate patient peripheral blood lymphocytes to form LAK cells [1668, 1669]. Lymphocytes are collected by cytopheresis and cultured with IL-2 for several days. IL-2-treated lymphocytes are then reinfused back into the patient. Oldham and coworkers later developed a protocol, which only required a very short bedside incubation of lymphocytes with IL-2 prior to reinfusion [794]. LAK cells are preferentially cytotoxic to neoplastic cells, though lysis of normal capillary cells has been observed [76, 375, 1512, 1855]. LAK cells act in a non-MHC-restricted manner [673, 1677]. In fact, the presence of strong MHC on the tumor cell surface inhibits LAK. Initial reports indicated that LAK appeared effective in metastatic renal cancer and melanoma with response rates of 15–25% [474, 541, 1667]. But subsequent reports for patients with renal cancer questioned whether the cells provided any added benefit to the IL-2 given systemically at the time of LAK therapy [1669, 1674]. It appears that cancer patients treated with IL-2 develop LAK-like cells in vivo [1670]. IL-2 has also been used ex vivo to stimulate outgrowth of tumor derived T cells. These expanded T cells are called tumor infiltrating lymphocytes (TIL) [1018, 1671, 2011]. They are also referred to as tumor derived

Walter M. Lewko and Robert K. Oldham activated T cells (TDAC) [1108, 1109, 1207, 1208, 1493, 1494]. In the original work in mice, Rosenberg showed these cells were 100x more potent than LAK in anticancer activity and TIL were effective against certain LAK-resistant tumor cells [1672]. TIL are part of the adaptive immune response system; they are cytotoxic in an MHC restricted manner; antigen presenting cells were involved in their development. TIL are grown to greater than 1010 cells and then reinfused back into the patient. Response rates in melanoma and renal cancer are on the order of 10–25% with some durable remissions. Combinations with other cytokines are still being tested for increased treatment efficacy. Biochemotherapy, the combination of traditional chemotherapy with biological response modifiers, produces an unexpectedly high response in melanoma patients. The reason for this is not understood. Response rate was correlated with increased serum IL-6 and IL-10, both Th2 cytokines, in patients receiving cisplatin, vinblastine and dacarbazine followed by IL-2 and IFN-α-2b [674]. However, in spite of response rates exceeding 50%, it is not clear that biochemotherapy adds any long term survival benefit over IL-2 alone. IL-2 is an effective adjuvant, stimulating immune responses to tumor cells in mice. IL-2 is being tested as a drug and as a product of genetically engineered cells, in tumor cell and dendritic cell cancer vaccines [30, 587, 588, 1106]. In addition to cancer therapy, IL-2 has been used to treat patients infected with human immunodeficiency virus. CD4+ cell levels were increased with no increase in plasma virus [1017]. IL-2 has also been used ex vivo to generate antiviral T cells, which were reinfused into patients [200, 2095].

Interleukin-3 Hematopoietic Cytokine IL-3 is a 28,000 mw protein. It is produced mainly by activated T cells [323, 324] but also by mast cells, thymic epithelium, keratinocytes, neurons, monocytes, neutrophils and eosinophils [835, 857]. In the past, IL-3 has been referred to as CFU stimulating activity, mast cell growth factor, Thy1 inducing factor, multicolony stimulating factor, P cell stimulating factor, and hematopoietic growth factor [1327]. The gene for human IL-3 is on chromosome 5 in close linkage with IL-4, IL-5, IL-9 and IL-13 [2227, 2248]. IL-3 is released during immune response and serves as a bridge between the immune and hematopoietic systems.

171 The receptor for IL-3 has two subunits. The IL-3Rα binds IL-3 [977]. It has homology with the GM-CSFRα [1010]. The β subunit is shared with receptors for IL-5 and GM-CSF [726]. The β subunit does not bind cytokine but as part of each receptor complex it enhances affinity for the cytokine and it is responsible for signaling (Jak2-STAT5) [1315]. IL-3, IL-5 and GM-CSF generate similar signals [697, 1323]. There is also evidence that the IL-3Rα chain signals [1314] adding complexity and specificity to the response. IL-3 stimulates the growth of most early multipotential progenitor cells and early committed precursors. IL-3 also stimulates macrophages, granulocytes and mast cells through their most mature forms. IL-3 is a major developmental cytokine for basophils [1061, 1230, 2033, 1296]. Only the later stages of the erythroid [857] and megakaryocytic [2171] lines are no longer sensitive. IL-3 thus increases the production of macrophages, granulocytes, erythrocytes, and megakaryocytes. Effects on early erythroid and megakaryocyte growth are rather distinctive to IL-3. IL-3 serves as a primer and costimulator while other cytokines act later to induce differentiation. It stimulates both cell division and cell survival [407, 835, 2229, 924, 1919]. It acts synergistically with several cytokines including IL-6 [843], IL-11 [1405], G-CSF [842], thrombopoietin [1027], stem cell factor [2031] and Flt3 ligand [1791]. In murine cell cultures, IL-3 tended to depress the B lymphoid potential of lymphohemopoietic progenitors [767]. In human cells, IL-3 increased the production of B cell progenitors from uncommitted CD34+ CD38− cells [353]. Osteoclast development in hematopoietic tissue is influenced by colony stimulating factors. IL-3 has been reported to be stimulatory and regulatory. In RANK ligand mobilized osteoclast precursors, IL-3 inhibited osteoclast differentiation, diverting the precursors to macrophages [956]. Natural cytotoxic (NC) cells [1524, 1912] are mast cell-like morphologically and they participate in immune reactions such as tumor rejection and graft versus host disease. They differ from standard NK cells in origin, growth and kinetics of target cell lysis. Natural cytotoxic cells are IL-3 dependent. Unlike NK cells, they do not respond to IL-2 [875–876]. Natural cytotoxic cells appear to induce lysis by the release of TNF [876]. IL-3 has been studied extensively for possible clinical use [479]. It has been tested in combination with other cytokines such as GM-CSF, M-CSF, and EPO to stimulate hematopoietic recovery of chemotherapy patients and bone marrow transplant recipients. IL-3 increased platelets, leukocytes and reticulocytes. Side effects due

172 to IL-3 (fever, headache, myalgia) were generally mild to moderate and manageable [589]. There were some benefits but not sufficient to warrant becoming a part of standard therapy. PIXY321 is a GM-CSF:IL-3 fusion product, which has been tested in cancer patients with similar results and toxicities [899]. Unfortunately, most patients developed neutralizing antibodies suppressing the effects of subsequent PIXY321 treatments [1311]. At present, the main clinical use for IL-3 is in the production of cultured stem cells for patient reinfusion and gene transfer protocols [214, 467, 475, 997]. It has been reported that IL-3 may stimulate [90] or inhibit [1789] certain hematopoietic malignancies. DT(388)IL3 is a diphtheria toxin-IL-3 fusion protein, which is being tested in patients with acute myelogenous leukemia. It kills malignant progenitors while sparing normal progenitors [781]. There is interest in the use of particulate tumor antigens for anticancer vaccination. Particulate antigens tend to induce cytotoxic CD8+ cells while soluble antigens induce CD4+ helper T cells. IL-3 appeared to be beneficial in this type of vaccination. IL-3 increased the number of antigen presenting cells, the percent of these cells actually presenting particulate antigen and the number of CTLs produced [1594, 2239].

Interleukin-4 B Cell and T Helper Response Interleukin 4 (IL-4) is a 20 kDa glycoprotein. It was originally called B cell stimulatory factor-1 (BCSF-1) for its effects on B cell growth and Ig secretion [514, 801, 1544, 1608, 2249]. IL-4 is produced by activated CD4+ Th2 cells [132, 1036, 1040, 1127, 1375], mast cells [189, 204], basophils [1190], eosinophils [1463], NK cells [461, 1154], γ/δT cells [2307], CD4+ CD8+ T cells [1086] and NKT cells [1087, 1832, 2252]. The gene for IL-4 is located on human chromosome 5 in a region with other cytokines including IL3, IL-5, IL-9 and IL-13. The IL-4 receptor is composed of two chains, IL-4Rα and γc, the common γ chain found in several receptors including the IL-2R [1372]. The α chain has the IL-4 binding site and conveys specificity as an IL-4 receptor. The γ chain is involved in signaling. There is another configuration of the IL-4 receptor in which IL-13Rα replaces the γ chain, in which case the same receptor complex binds and responds to both IL-4 and IL-13 [736, 1439]. Signaling involves phosphorylation of certain proteins including the receptor itself and phosphati-

Cytokines dylinositol-3′ kinase [944]. In mononuclear and B cells, IL-4 receptor levels are increased by IL-4; IFNγ inhibits this increase [1853]. In addition to the membrane bound receptor, there is a soluble form found in body fluids and in the medium of cultured cells [526, 527]. The soluble receptor is smaller in size but it retains the capacity to bind IL-4 [1374]. The soluble receptor is not due to proteolysis of the membrane receptor, but rather differential mRNA splicing [122, 1374]. IL-4 stimulates soluble receptor production, apparently as a way of regulating IL-4 activity [307, 1638]. Soluble receptor competes with the membrane receptor for IL-4 [527, 1212]. The function of the soluble receptor appears to be mainly inhibitory [1212, 1730] but stimulatory [1730, 1871] effects have also been observed. Further, the soluble receptor may also serve as a carrier for IL-4, which protects IL-4 from metabolism and excretion, increasing its functional half-life [526, 457]. Dissociation of IL-4 from the soluble receptor would allow it to bind and activate the membrane receptor. IL-4 has a major role in immune response. It has direct effects on target cells, which are often synergististic with other cytokines. IL-4 also has a major regulatory function in immunity by its influence on the Th1/ Th2 system [2, 254, 1821]. IL-4 induces precursor Th0 differention to Th2 cells [2]. In part, regulation in the Th1/Th2 system involves apoptosis, programmed cell death. Glucocorticoids favor apoptosis in thymocytes and in mature T cells. Several cytokines including IL-4, IL-2 and IL-1 inhibit glucocorticoid-induced apoptosis. IL-4 specifically rescues Th2 cells from death while IL-2 rescues Th1 cells [1306, 2308]. As B cells depend on T cells for help, IL-4 is one of the major cytokines for this purpose. IL-4 acts directly on B cells and it is the main inducer of other Th2 cytokines, most of which also stimulate B cells. IL-4 increases pre-B cell growth, differentiation and Ig secretion [1015, 1597, 1850, 1851, 1871, 2082]. IL-4 stimulates class switching and the production IgG1 and IgE [321, 329, 409, 1552, 1851, 1871]. Among its other effects, IL-4 increases MHC II on B cells for antigen presentation [1459]. In bone marrow IL-4 has a synergistic effect with IL-11 on the induction and growth of hematopoietic progenitor cells [1407, 1537, 1637]. IL-4 increases the growth of monocytes [1974], macrophages [1447] and increases macrophage antitumor activity and antigen presentation [239, 351, 2302]. IL-4 enhances the growth of activated PBL but had little effect on unprimed resting cells. Timing of the cytokine appears to be a factor. While IL-4 stimulated

Walter M. Lewko and Robert K. Oldham PBLs previously activated with IL-2, IL-4 added to cultures simultaneously inhibited proliferation induced by IL-2 [707, 2021]. IL-4 tends to stimulate the growth of thymoctyes [2301] and T cells [2152]. But IL-4 effects are complex and in certain circumstances may be inhibitory [2153]. In cultures of TIL, addition of IL-4 in combination with IL-2, grew T cells from human tumors with specific activity against autologous tumor [933, 934, 1108, 2034]. IL-2 was required; TIL could not be generated using IL-4 only [934]. IL-4 induced the IL-2 receptor in mouse T cells [254]. IL-4 together with IL-2 produced better TIL growth and specific antitumor activity in many but not all tumors [534, 933]. In certain TIL cultures, early growth effects of IL-4 were lost or even reversed with time [534, 933]. In another study, IL-4 in combination with IL-2 tended to produce more T cells with increased antitumor cytotoxicity compared to TIL induced with IL-2 only (8,724). We developed an IL-4 dependent T cell line from a node specimen of a lymphoma patient. This tumor cell line required IL-4 in addition to IL-2 [1108]. Other reports did not show remarkable benefits of IL-4. In one study using melanoma, the addition of IL-4 to IL-2 promoted TIL growth in a minority of cases (5/24), but decreased growth in most cases (17/24). Likewise, specific lysis was enhanced by IL-4 in a minority of cases but depressed in the majority (13/19) [1132]. It may be that IL-4 stimulated those T cells, which had been optimally activated by tumor antigen, but inhibited those cells, which had not been properly activated. Treating PBLs with IL-2 typically induces LAK cells. In mice IL-4 could induce LAK in the absence of added IL-2 [1388]. When mouse PBLs were induced with IL-2, IL-4 tended to enhance LAK activity [1388]. In human PBLs, LAK may be induced by IL-4 in cancer patients pretreated with IL-2 but not in unprimed cells [752, 874, 932, 933]. In previously untreated cells, IL-4 added at the same time as IL-2 inhibited induction of LAK by IL-2 [203, 707, 752, 932, 1870, 2152]. Priming with IL-2 in vivo or in culture was necessary for IL-4 activity. Loss of the IL-2 receptor may be the mechanism by which IL-4 inhibited LAK [1133]. Knockout mice have been developed which are deficient in IL-4. IL-4 has many important and interrelated immune functions, but it is interesting that these mice had a relatively normal immune profile. Serum IgG1 was low. In response to nematode infection, the normal rise in IgE levels failed to occur. Otherwise, T and B cell development appeared relatively normal [1032]. More recent studies showed that IL-4 deficient knockout mice had impaired antitumor cellular immunity (Schuler T. 1999).

173 This may be related to the observations that long term IL-4 benefits IL-12 secretion that in turn stimulates cellular immunity [911]. IL-4 appears to have a role in several inflammatory diseases. IL-4 together with IL-3 stimulated proliferation of mast cells [1374, 2032, 2033], polymorphonuclear leukocytes [518] and fibroblasts [1342]. IL-4 also stimulates ICAM-1. In allergic airway inflammation, eosinophils accumulate and release IL-4 [1463]. IL-4 increases production of IgE [321, 329, 1552, 1852, 1872]. IL-4 also induces eotaxin, to further increase eosinophil infiltration [2298]. In TNF-activated keratinocytes, IL-4 enhances secretion of chemokines, which in turn attract and activate effector cells [19]. While IL-4 may have a role promoting inflammation, it also modulates inflammation directly, or by way of the Th system [1541]. In monocytes IL-4 inhibits production of IL-1, TNF-α and IL-6 while it stimulates IL-1Ra [525, 1973]. Conversely, IL-1 inhibits the production of IL-4 [1720]. Mouse autoimmune allergic encephalitis is a Th1-related disease. In knockout mice lacking IL-4, the disease was exacerbated; treatment with IL-4 had a protective effect [507]. There is, therefore, clinical interest in IL-4 for the management of allergy, inflammation, autoimmune disease and also cancer. The receptor for IL-4 is expressed in several types of cancer. In culture, IL-4 has inhibitory effects on certain hematological malignancies [16, 399, 452, 850, 1214, 1630]. IL-4 also inhibited the growth of certain solid tumor cells including breast [2004], stomach [1358, 1359], colon [2004, 2013] melanoma [790], lung [2012, 364], sarcoma [1602] and renal [791, 1473]. Antitumor effects in culture were generally IL-4 receptor-dependent [17, 1359, 1473, 1602]. IL-4 may be considered angiogenic in that normal fibroblasts and endothelial cells are stimulated by IL-4 [574, 1342, 2005]. On the other hand, it has also been reported IL-4 is antiangiogenic [2083]. In animal studies, IL-4 inhibited certain human head and neck, glioma and colon cell lines growing as xenografts in nude mice. No remarkable immune cell infiltration accompanied depressed growth [2012, 2013]. An acute lymphoblastic leukemia cell line from a child grew in nude mice. IL-7 stimulated growth while IL-4, TNF and IFN were inhibitory [664]. There are other reports of inhibited acute lymphoblastic leukemia, non-Hodgkin’s lymphoma and multiple myeloma cell growth [16]. These animal studies showed IL-4 may be able to inhibit tumor growth directly in addition to its immune effects. But the growth inhibition is in most cases just that; decreased growth rate; growth proceeds but at a slower pace.

174 Phase II trials have been carried out using IL-4 in cancer patients [85, 1157, 1171, 1226, 1971, 2021, 2150]. Unfortunately, response rates were very low and toxicities were significant, particularly in the gastrointestinal tract [1157]. IL-4 may cause cardiotoxicity [2020]. In vitro inhibitory effects of IL-4 on B cell chronic lymphocytic leukemia could not be confirmed in treated patients [1167] Vaccines have been tested using mouse tumor cells genetically engineered to produce IL-4. In mice vaccinated with IL-4 secreting tumor cells [637, 1979, 2264] or IL-4 secreting fibroblast cells mixed with tumor cells [1572], animals rejected the modified tumor cells and subsequent challenges of parental tumor cells [2264]. Cures of established tumors have also been reported [30, 636]. These approaches are now being tried in patients [67, 1485]. IL-4 stimulates cell growth and antigen presentation in dendritic cells, B cells and macrophages [239, 351, 1974, 2301, 2302]. Cancer patients, treated with daily sc IL-4 and GM-CSF had increased numbers of circulating antigen presenting cells [1683]. In current dendritic cell protocols for tumor vaccination, IL-4 is often used in culture together with GM-CSF to prepare and grow the dendritic cells for patient treatment [2039].

Interleukin-5 Eosinophil Growth/Differentiation; Inflammation; Augmentation of T, B, NK and Mast Cells IL-5 is a 12–18 kDa protein, which was originally known as B cell growth factor 2 (BCGF-2), T cell replacing factor, eosinophil colony stimulating factor, eosinophil differentiation factor and IgA enhancing factor. The human gene is located on chromosome 5 where it is linked with several other cytokines including IL-3, IL-4, IL-9 and IL-13 [969]. The molecule is a homodimer held together by disulfide bonds [96, 969]. IL-5 is produced by activated Th2 cells [1935, 1936], mast cells, eosinophils [202, 418, 459] and NK cells [2121]. In NK cells, IL-5 production is enhanced by IL-4 while IL-10 and IL-12 are inhibitory [2120]. The receptor for IL-5 is composed of two subunits, an α chain (IL-5Rα) and a β chain, which is identical to the β chain of IL-3R and GM-CSFR. The α chain binds IL-5. Its structure is quite distinct from that of the α chains of the IL-3R and GM-CSFR [1010, 1398, 1929, 1970, 2040]. The β subunit enhances the affinity of the α chain for IL-5 and it is responsible for signaling.

Cytokines Signaling is through the Jak-STAT pathway. IL-3, IL-5 and GM-CSF show similar patterns of signaling [1320, 1323]. There is evidence that the IL-5Rα chain also signals adding to the uniqueness and complexity of the IL-5R signaling system [1316]. There are membrane bound or soluble forms of the receptor, the result of alternative mRNA splicing [1970]. The soluble form appears to have a regulatory role in eosinophilia in that it binds IL-5 and neutralizes its activity [205, 421]. IL-5, IL-3 and GM-CSF downregulate the levels of IL-5Rα. This happens rather rapidly, within hours. This regulation occurs at the level of mRNA transcription as the gene is turned off [2105]. IL-5 stimulates growth and differentiation of eosinophils [1723, 2222]. It activates eosinophil function [1151] and potentiates chemotactic responses in eosinophils by IL-8 and RANTES [1769]. IL-5 also stimulates B cell growth and the production of IgA and IgM [1722, 1935, 2246, 2247, 1953]; as such it is one of the main factors from T cells, which provides help to B cells [96, 969]. IL-5 enhances IL-2 receptors and responsiveness in T cells and NK cells [935, 1953]. IL-5 augments IL-2-induced LAK activity in peripheral blood cells [58] and promotes, together with other factors, T cell differentiation and mast cells growth [2246]. Eosinophils have important proinflammatory effects, particularly in asthma [635, 783, 938]. For this reason there is interest in IL-5 and its antagonists in asthma and other inflammatory diseases [1723, 1278]. Though IL-5 influences several cells in immune response, significant antitumor activity in preclinical models has not been demonstrated. No clinical trials with IL-5 in cancer have been done.

Interleukin-6 Hematopoiesis, Thrombopoiesis, Inflammation IL-6 is the founding member of the IL-6 family of cytokines which includes leukemia inhibitory factor, oncostatin M, ciliary neurotrophic factor, cardiotrophin-1, novel neurotrophin/B cell stimulating factor-3 and IL-11. These cytokines share structure and their receptors share a common gp130 subunit for signaling [183, 601, 906, 2273]. IL-6 is a 22–27 kDa glycoprotein. It is also referred to as B cell stimulating factor-2, B cell differentiation factor, cytotoxic T-cell differentiation factor, hepatocyte stimulating factor, IL-1 inducible 26 kDa protein, and

Walter M. Lewko and Robert K. Oldham interferon β2 [2052]. The gene for IL-6 is located on chromosome 7p21. Its primary structure has some homology with G-CSF [766]. IL-6 is produced by several types of activated cells including fibroblasts [1257], macrophages, B cells [1868], CD4+ Th2 cells [1043], CD8+ T cells [1708], epithelial cells [1023], endothelial cells [2213], eosinophils [1287], astrocytes [1079], neurons [1234, 1646], synovial cells [1324, 1940], megakaryocytes [1324], osteoblasts [859], mast cells [580], keratinocytes [365], Langerhans’ cells [365], neutrophils [496, 1287], colon epithelial cells [907] and certain tumors [743, 1164, 1749]. As with many other cytokines, the regulation of IL-6 is complex and disregulation may be involved in disease. IL-6 levels increase with bacterial and viral infection, inflammation and trauma [2053, 2102]. Wound fluids contain IL-6 and wound fibroblasts secrete IL-6 in culture [1238]. IL-6 levels may increase remarkably after surgery, up to several hundred-fold. Thrombin, which induces clotting and wound healing, stimulates the production of IL-6 by fibroblasts, epithelium and other types of cells [1865]. Endotoxin and TNF-induce the production of IL-6 and other inflammatory cytokines [550]. IL-1 increases expression of IL-6 and IL-8 in skin fibroblasts and arthritic synovial cells [612]; TGF-β induced the production of IL-6 in several cells including monocytes, keratinocytes and bone marrow stroma. In plamacytoma cells TNF and IL-1 were both stimulators of IL-6 production [2052]. IL-4 and IFN-γ acted synergistically to enhance IL-6 production in endothelial cells [803]. In lung fibroblasts, TGF-β induced IL-6 synthesis by a transient burst of H2O2 followed by an increase in cellular calcium, which activated the signal pathway for IL-6 expression [909]. And CD40 engagement stimulated IL-6 in B cells and several non-hematopoietic cells; activation of NF-κB was involved in the process [487, 743]. Heparin and heparin sulfate selectively bind IL-6 and several other cytokines. Bound cytokine, upon dissociation, is available to its receptor. Heparin protects the cytokine from proteolysis and may serve to keep the cytokine in high local concentration, close to where it was secreted, available for paracrine effect [1392]. The receptor for IL-6 is composed of two subunits, the IL-6Rα chain and gp130. IL-6 binds to the IL-6Rα subunit [2225], which in turn binds, dimerizes and activates gp130 subunits [1566, 1943]. This leads to the activation of tyrosine kinases, in particular Jak1. These kinases phosphorylate gp130; gp130 then binds and activates STAT transcription factors, in particular STAT3. Phosphorylated transcription factors translocate into the nucleus where target genes are activated [1566].

175 STAT 3 has different and even opposite functions depending on the cell type and physiological status. The gp130 subunit is shared with the receptor for oncostatin M and other members of the IL-6R cytokine family [602, 974, 1138]; the shared subunit appears responsible for the common effects brought about by these cytokines. Essentially all the cells of the body produce gp130, whereas IL-6Rα is expressed by IL-6 target cells including B cells [766] hepatocytes [610], monocytes, CD4 and CD8 T cells [2183], CD34+ stem cells [1946, 2183], neurons [1752], neutrophils [1331] and osteoblasts [2041]. There is a soluble form of IL-6Rα. It is interesting in that unlike most soluble cytokine receptors, it is active. The soluble IL-6Rα is generated in two ways, by proteolytic cleavage of cell surface receptor and by alternate splicing of mRNA [1391, 1665]. TACE, the protease involved in TNF-α production, appears to be responsible for proteolytic shedding of IL-6R [716]. The soluble form binds IL-6 and mediates IL-6 responses in target cells that express the gp130 but lack membrane bound IL-6Rα [1197, 1562]. Certain hematopoietic cells [1563], neurons [1234] and smooth muscle cells [987] were responsive to IL-6 only in the presence of the soluble receptor subunit. IL-6 has a major role in the regulation of hematopoiesis, inflammation and immunity. IL-6 −/− knockout mice were defective in immune and acute phase protein responses [991]. IL-6 stimulates proliferation of multilineage hematopoietic stem cells. Mice that over expressed both IL-6 and the soluble IL-6 receptor had grossly enlarged livers and spleens, and overproduced blood cells [1562]. IL-6 arrests the growth of cultured M1 cells while inducing differentiation into macrophages. IL-6 stimulates B cell differentiation and immunoglobulin production [766, 1394, 1872, 2064]. IL-6 is a costimulator of growth and cytokine production in thymocytes and T cells [1155, 2016, 2064]. IL-6 stimulates T cell activation, differentiation and antitumor activity [1385]. Fibroblasts and epithelial cells secrete IL-6 in response to blood clotting [1865]; along with other factors, IL-6 enhances megakaryocyte colony formation and the production of platelets [308, 755]. Natural killer cells are activated by IL-6 in peripheral blood lymphocytes [584, 838, 1847]. IL-6 has direct effects on several types of nonimmune cells. IL-6 is a hepatocyte stimulating factor [999]; it induced the production of acute phase proteins including fibrinogen [258] and the receptor for anaphylatoxin C5a [1740]. IL-6 also induced acute phase proteins in intestinal cells [1340]. IL-6 and the other inflammatory cytokines TNF-α and IL-1 induce ACTH and cortical release [1237]. IL-6 has a part in angiogenesis;

176 it stimulates endothelial cell growth and blood vessel formation [1378]. IL-6 also increases fibroblast outgrowth and collagen production for wound repair [468]. Physiological levels of IL-6 appear to protect neurons and support nervous system repair [682, 1037]. Mice that over expressed both IL-6 and its receptor showed accelerated nerve regeneration after damage [769]. In bone, IL-6 stimulated osteoclast production and bone resorption activity [1220]. IL-6 may be involved in epithelium-stroma signaling during normal development, for example, in breast tissue [831]. IL-6 appears to have a role in inflammatory conditions. The blood of patients with gram-negative septic shock contained elevated IL-6, TNF, IL-1 and LIF and the levels of each were correlated with disease severity [2077, 2118, 2119]. IL-6 and LIF were induced by TNF-α [880]. IL-6 and its soluble receptor were elevated in inflamed intestinal tissue [676, 1317]. IL-6 was one of the proinflammatory cytokines required for the induction of mouse colitis as a model for human Crohn’s disease [2223], for experimental antigen-induced rheumatoid arthritis [1510] and autoimmune encephalomyelitis [1718]. IL-6 is among the several proinflammatory cytokines expressed by synovial cells of arthritic patients [1324, 1963]. IL-6 is elevated blood and cerebral spinal fluid of patients with multiple sclerosis, Parkinson’s and Alzheimer’s disease [168, 682, 1434]. Overexpression of IL-6 in mouse brain induced acute phase proteins and neurodegeneration [235]. In scleroderma patients, IL-6 was one of the cytokines required for the continued production of autoimmune antibodies [1043]. IL-6 may play a part in cardiac disease. Fibrinogen is considered a cardiovascular risk factor [497]. Fibrinogen levels are elevated during inflammation; IL-6 is one of the main inducers of fibrinogen expression [1620]. IL-6 is generally referred to as a proinflammatory cytokine, but it appears to be involved in the resolution of inflammation as well. IL-6 attenuates the synthesis of proinflammatory cytokines while it has little effect on production of cytokines such as IL-10 and TGF-β. In IL-6 deficient mice, inflammation, eosinopilia, the secretion of chemokines and Th2 cytokines were increased. In mice that produced excess IL-6, inflammation and Th2 cytokine secretion were decreased [2102]. IL-6 has also been shown to induce the production of IL-1 receptor antagonist and the soluble TNF receptor, both of which inhibit inflammation [1998]. In astrocytes, IL-6 inhibited expression of TNF-α and down regulated levels of cell adhesion molecules [137, 1480, 1816]. One mechanism for the anti-inflammatory effects of IL-6 (and the related cytokine IL-11) may involve inhibition of transcription factor NF-κB [2023].

Cytokines Human herpes virus 8, which is associated with Kaposi’s sarcoma, produces a viral IL-6 molecule that has 25% homology with human IL-6 [1437]. It has certain effects that are similar to those of cellular IL-6 [226]. The viral IL-6 appears to be responsible for some of the virus’ pathology, including increased angiogenesis and hematopoiesis [60]. Interestingly, the viral IL-6 binds directly to gp130 and exerts its effects on cells independently of the IL-6 receptor, for which viral IL-6 appears to have little or no affinity [1390]. In preclinical studies, IL-6 showed promise as an anticancer agent. In vitro, IL-6 inhibited the growth of certain breast cancer cells, leukemia, lymphoma and other cell lines [296, 1357]. IL-6 increased ICAM-1 (CD54) in certain breast cancer and melanoma cell lines [831, 973]. IL-6 inhibited growth in several mouse tumor models; these mice developed tumor-specific CTLs, but not LAK cells. In mice treated with IL-6, growth and metastasis of Lewis lung [927] and melanoma [926, 1164, 1165] were inhibited. Resistance may develop in IL-6 sensitive cells. Loss of sensitivity was associated with loss of IL-6 receptors in some but not all cases [1825]. IL-6 is involved in the inflammatory response that produces tumor infiltrating lymphocytes [1385]. In cultures of TIL from human renal cell carcinoma, addition of IL-6 to the standard IL-2-containing medium stimulated TIL growth though not tumor cell kill; IL-6 alone did not induce TIL proliferation [1082]. In vaccination studies, IL-6 engineered mouse mammary tumor cells offered some protection to subsequent challenge by unmodified tumor cells. IL-6 and other IL-6 family members (IL-11, LIF, CNTF, NNT) induce appetite loss and wasting. In mice, colon adenocarcinoma cells produced elevated serum IL-6 and cachexia. The drug Suramin interfered with the binding of IL-6 to its receptor and reversed cachexia in tumor bearing mice [1900, 1901]. IL-6 is an autocrine growth factor in certain human cancer cells including multiple myeloma [115, 724, 1478], B-cell leukemia [754], cervical carcinoma [503], renal cell carcinoma and prostate cancer [1005, 1307, 1955]. In myeloma, growth stimulation appears to be linked with several of the IL-6 family cytokines (OSM, LIF, CNTF, IL-6) [689, 690, 2147]. In human melanoma, there is evidence that with tumor progression, there is a transition from IL-6 paracrine growth inhibition to autocrine growth stimulation. Serum IL-6 in melanoma patients was found to be a prognostic factor for poor survival and lack of response to IL-2 therapy [1966]. IL-6 was tested in cancer patients, including renal cancer, in phase I and II trials [2057, 2126, 2136].

Walter M. Lewko and Robert K. Oldham In addition to its potential anticancer activity, there was interest in IL-6 for the stimulation of platelet and blood cell levels. Patients treated with IL-6 demonstrated the usual cytokine flu-like side effects plus reversible anemia, leukosis, thrombocytosis, increased acute phase proteins, heart problems, elevated bilirubin and confusion indicative of neurotoxicity. There was a suggestion of benefit in certain studies but toxicity was significant. One report, a phase II study in advanced renal cell cancer, showed lack of efficacy [1758]. Anti-IL-6 monoclonal antibodies have been used to treat patients with myeloma [114, 2065] and AIDS associated Kaposi’s sarcoma [1610] without any apparent benefit. In a phase I trial involving pediatric patients given IL-6 plus G-CSF after myelosuppressive chemotherapy, there were increased hematological responses but with a high incidence of toxicity [188]. IL-6, IL-10 and TGF-β are cytokines reported to be secreted by tumors, which interfere with dendritic cell differentiation and antigen presentation, resulting in ineffective antitumor immune response [129].

Interleukin-7 T Cell, B Cell, Macrophage and Dendritic Cell Development IL-7 was first described as a factor produced by mouse bone marrow, which stimulated B-lymphocyte progenitor cells to multiply and develop [1422, 1423]. IL-7 is a 25 kDa glycoprotein. It is produced by bone marrow stroma [641, 1422, 1423], thymic stroma [1716], keratinocytes [69, 745, 1245], human intestinal epithelium [2115], B cells [134], follicular dendritic cells and vascular cells [1024]. IL-7 is also produced by tumors including certain carcinomas [910] leukemias [569, 1578] and lymphomas [973, 1001]. IL-7 is not detected in normal T cells [2263]. Upon secretion, IL-7 binds to integrin in the extracellular matrix; this may be the form utilized by thymocytes [980]. The IL-7 receptor is composed of two subunits, IL-7Rα and γc. The IL-7Rα chain contains the IL-7 binding site [640]. The γc is shared between IL-2R, IL-4R, IL-7R, IL-9R and IL-15 R [1002]. γc enhances receptor affinity of IL-7 and it participates in signaling [1002, 1461]. The activation response involves Jak1, pI-3 kinase, STAT3 and STAT5 [556]. Receptors that share γc have similar but not identical nuclear effects. Lack of active γ chain in patients with severe combined immunodeficiency disease results in loss of function in these five receptors. Loss of IL-7R function is a major reason for poor immune response in these individuals.

177 There is a soluble form of the receptor that is produced by a specific mRNA [641]. Three different IL-7 binding affinities have been observed [74, 558, 1523, 2017]. The highest affinity receptor is generally found in activated cells and appears to be the one responsible for cell division [73, 1523]. In human T cells, response to IL-7 depends on the activation state. In resting cells, IL-7 induces certain cellular proteins (CD25, IL2 R) but no proliferation. In activated cells, IL-7 is a potent inducer of cell division [648, 1365]. Immunosuppressive drugs cyclosporin and FK506 inhibit IL-7 stimulated growth, apparently by interfering with the function of the high affinity receptor [557]. IL-7 has important influences on several different immune cell types. Genetically deficient mice, lacking IL-7, were extremely lymphopenic [2084]; early lymphocyte development was severely impaired [1548]. In mice there is an absolute requirement for IL-7 in the development of B and T cells. Interestingly, it is unusual for the loss of any one cytokine to cause such impairment. This is probably due to redundancy of cytokine functions, which is not the case for IL-7 in mice [2084]. In humans, IL-7 is not so strictly required for the development of B cells [1592]. IL-7 induces the growth of early B lineage cells. In B lymphocytes, IL-7R was found on pre-B cells but not on mature B cells, consistent with its role in the early stages of B cell maturation [371, 372, 1918]. Stem cell factor and Flt3 ligand are costimulators [1229, 1424]. IFN-γ blocks the stimulatory effect of IL-7 on pre-B cells [592]. Mice deficient in IL-7 fail to support normal B cell development [2084]. For prolonged B cell outgrowth, additional IL-7 related signals appear to be required, which occur by way of physical contact with stromal cells. IL-7 supports outgrowth of pre-B and pro-B cells but the pre-pro-B cell population requires, pre-pro-B cell growth-stimulating factor. PPBSF is composed of at least two covalently associated subunits, one of which is an IL-7 chain. The other subunit is a protein that is attached to the stromal cell surface. Pre-pro-B cells bind PPBSF during stromal cell contact; PPBSF stimulates division and primes the cells for IL-7 [1273]. Thymic stromal lymphopoietin is another IL-7-related factor in early B cell development. It was discovered in the conditioned medium of a thymus cell line [568]. TSLP and IL-7 have overlapping actions [568]. TSLP binds the IL-7Rα with another receptor subunit; it does not use γc. TSLP induces the transcription factor STAT5 as does IL-7, but TSLP did not activate any known Janus kinases. Normal T cell development depends on IL-7. Mice lacking IL-7Rα [1205, 1223, 1548] and mice treated

178 with neutralizing antibodies to IL-7 [650] do not produce normal T cells. γδ T cells are missing entirely in IL-7Rα (−/−) mice [728, 1548]. αβ T cells are present, but they are not responsive [1548]. IL-7 is a growth/ differentiation factor for fetal pre-T cells, thymocytes [143, 735, 1492, 2080, 2153] and mature CD4+ and CD8+ T lymphocytes [73, 143, 293, 347, 564, 648, 1148, 1365, 2243]. An important effect of IL-7 in both T and B cells appears to be its stimulation of the bcl-2 antiapoptotic pathway, for the maintenance of lymphocyte viability [15, 1222, 2085]. IL-7 was the only cytokine among 16 factors tested capable of inducing rearrangement (diversity) in the T cell receptor V(D)J region. IL-7 activated expression of the RAG1 and RAG2 genes involved in gene rearrangement [306, 1383]. In activated human peripheral blood T cells, IL-7 induced the secretion of several cytokines including IL-2, IL-3, IL-4, IL-6, IFN-γ and GM-CSF [442, 443]. IL-7 also increased antitumor cytotoxicity in T cells [22, 143, 749, 776, 1180] and this cytotoxicity may persist long term in culture without frequent antigenic restimulation [1182]. IL-7 acts together with several cytokines in the development of T cells [2139]. Flt3 ligand and stem cell factor [1350, 1364] are co-stimulators with IL-7 for early T cells. IL-1 and GM-CSF induced outgrowth of mouse thymocytes; IL-7 was required [735]. IL-2 acts together with IL-7 to stimulate antigen-induced effector cells from memory CD8+ T cells. IL-7 may act alone or with IL-2 [125, 1283]. Together the effect is synergistic [1283]. IL-7 stimulates IL-2 receptor (CD25) levels in resting T cells [73]; this may explain the synergy. Among its many other functions, IL-7 induced proliferation and antitumor activity in human blood monocytes and macrophages [24, 871]. In treated mice, IL-7 mobilized myeloid progenitor cells from bone marrow to peripheral sites [686]. It supported eosinophil progenitors in human bone marrow cell culture [2071]. IL-7 induced lymphokine activated killer cells [1181, 1736, 1896]. While IL-2-LAK exhibited better melanoma cell kill, IL-7 LAK killed with a different pattern of cytokine release [1431, 1432], without TNF secretion and without toxicity towards normal cells [1731]. IL-7 appears to have a part in antigen presentation. IL-7 was a growth factor for mouse dendritic epidermal T cells [1245, 1246]. Dendritic cells produce IL-7 [1022]. Keratinocytes that surround the dendritic cells in skin produce IL-7 and TNF-α [1245, 1246]. Together these cytokines stimulated dendritic cell growth. IL-7 also increased levels of the co-stimulatory protein B7 on B cells [414]. Lymphopenia can occur in patients with HIV infection and chemotherapy. It has been shown that IL-7 may

Cytokines be administered to patients to expand CD4+ and CD8+ lymphocytes. This occurs with a decrease in the percentage of regulatory CD4+ T cells [1673]. Several preclinical studies suggested IL-7 may be useful in the treatment of cancer. Lung metastases of Renca renal cancer cells were reduced in mice treated with rhuIL-7; the mice showed increases in T cells, CD8/CD4 ratio, B cells, macrophages and NK cells [1001]. Nude mice with human colon cancer xenografts lived longer when treated with rhuIL-7 plus human T cells compared to mice treated with either alone. The antitumor activity appeared due to interferon induced in CD8+ cells, not cytolysis. Interestingly, injected interferon was not that effective suggesting local continuous release was better than systemic interferon therapy [1402]. IL-7 appears to be a good adjuvant during tumor vaccination. Tumorigenesis was decreased in mice inoculated with IL-7 gene engineered plasmacytoma cells [775], glioma cells [59] and fibrosarcoma cells [1261]. Animals that rejected engineered tumor cells developed immunity to subsequent injections of the parental cells [61, 1261]. The tumors were infiltrated with T cells. Complement receptor rich macrophages, eosinophils and basophils were also increased [776, 1261]. IL-7 was one of several cytokines which upregulated intercellular adhesion molecule-1 (ICAM-1) on human melanoma cells. This protein is involved in immune recognition and anticancer action [973]. Tumor infiltrating lymphocytes have been used to treat cancer patients. Interleukin-2 is used to activate and grow TIL in culture. IL-2 generally stimulates good initial growth and tumor cell kill, but antitumor activity is often difficult to maintain over the long culture time needed to grow sufficient cells for therapy, especially when tumor cells are not available as a source of antigen to restimulate the T cells. There are reports of difficulty maintaining CD4+ helper cells in IL-2-induced cultures. IL-7 has been examined to determine whether it provides any benefit in culture. IL-7 alone stimulated the growth of TIL cultures from certain renal cancer and enhanced IL-2-induced growth in others [1182]. Growth and antitumor activity persisted during long term culture. Antigen restimulation was not required to maintain antitumor activity. Others have reported IL-7 was not beneficial at the initiation of TIL culture but rather IL-7 stimulated growth and cytokine secretion in cultures that were already responding to IL-2 [1820]. There are reports that IL-7 stimulates certain types of cancer. IL-7 increased the growth of several leukemia cell lines [664, 1242, 1351, 1491, 1531, 2017]. Sezary lymphoma cell lines responded to IL-7 and

Walter M. Lewko and Robert K. Oldham IL-2 with increased and in some cases synergistic growth [374, 554]. The effect of IL-7 may be autocrine or paracrine [554, 664]. Abnormal cytokine secretion by tumor cells may be responsible for immune system abnormalities common in CLL patients [569]. Transgenic mice have been developed with increased IL-7 expression in lymphoid tissues. These animals had remarkable skin T cell infiltrates, the result of the growth stimulating effects of IL-7. These transgenic mice also produced T and B cell lymphomas. This model system shows that the IL-7 locus could behave as an oncogene. There have been preliminary studies using IL-7transfected autologous tumor cells as vaccines. Phase I trials in patients with melanoma showed that IL-7 genetransfected, irradiated cells administered subcutaneously were safe and produced tumor-specific CTL responses. One minor clinical response was reported [1338, 1339]. Another study, a phase I/II trial in ten patients with metastatic carcinoma, used autologous tumor cells transfected with IL-7, GM-CSF and double stem-loop immunomodulating oligodeoxyribonucleotides (d-SLIM). One CR, one PR and one MR were observed [2179].

Interleukin-8 Chemotaxis, Angiogenesis IL-8 is a potent chemotactic and proinflammatory cytokine [1250, 1384]. It is a member of the CXC (ELR+) chemokine family (see below). IL-8 is a relatively small, 6,000–8,000 mw glycoprotein [1755, 2096, 2257]. It is secreted by a variety of cell types including macrophages [1755], endothelial cells [623, 1455, 1603, 1756, 1905], neutrophils [255, 1949, 2130], epithelial cells [123, 913, 961, 1878], fibroblasts [1063], keratinocytes [1063, 2281], mast cells [1337] and eosinophils [2261]. Certain tumor cells also produce IL-8 including melanoma [1737], squamous cell carcinoma [2281] colon adenocarcinoma [1757]. IL-8 secretion is controlled by various factors such as IL-1 [1063, 1757], IL-3 [2121], IL-5 [1769], GM-CSF [1264, 2121], TNF [1063, 1904], vitamin D [2281], lipopolysaccharide [1757] and fibrin [1603]. Mast cell secretion of IL-8 was specifically stimulated by stromal cell factor-1 [1130]. There are two receptors for IL-8, CXCR1 and CXCR2 [5, 787, 1074, 1371, 1400]. These receptors bind IL-8 with high affinity and they also bind other members of the chemokine family [1074]. There are receptors for IL-8 on neutrophils, T cells, mast cells, macrophages,

179 endothelial cells and keratinocytes [950]. Like other chemokine receptors, the IL-8 receptors are members of the rhodopsin superfamily; these proteins characteristically contain seven transmembrane domains. Chemokine receptors are linked to phospholipase C through G proteins. Receptor activation results in increased diacylglycerol, inositol triphosphate and increased intracellular calcium released from cellular stores. IL-8 was first described as a macrophage-derived chemoattractant for neutrophils [1384, 1755, 2096]. IL-8 is also a chemoattractant for T cells [98]. It has little effect on B cells. In dogs injected with human IL-8, the site became infiltrated, mainly with neutrophils [1987]. IL-8 stimulates neutrophil production of superoxide anion, degranulation with the release of hydrolytic enzymes such as elastase, and migration through endothelium of capillaries [101, 252, 815, 1565]. Mast cell-dependent recruitment of neutrophils appears to be mediated by IL-8 [1130]. IL-8 also induces migration in IL-2 activated peripheral blood NK cells [1774]. In rabbits, IL-8 blocking antibodies had an inhibitory effect on inflammation, especially in the lung [1780]. IL-8 also stimulates angiogenesis [1346]. IL-8 is an attractant to antigen presenting cells such as macrophages and eosinophils [408, 1769, 1777]. As such, IL-8 may have an important role in the initiation of immune response as well as the recruitment of effector cells that carry out the response. Fibrin formation is associated with trauma, inflammation, wound healing and cancer. The addition of fibrin to cultured endothelial cells induced the release of IL-8 [1603]. The physical act of blood clotting may stimulate cytokine release and cell migration. Besides IL-8 there are several additional proteins and peptides that are chemotactic to immune cells; macrophage inflammatory protein α (MIP), IL-1α, and RANTES (see below) to mention a few. IL-8 appears to have a role in inflammatory diseases. Arthritic synovial fibroblasts constitutively oversecrete IL-8; IL-1β, itself elevated in synovial fluid, stimulates secretion further. Specific inhibitor studies showed that NF-κB, an important signal for inflammation genes, was involved in both spontaneous and IL-1-induced expression of IL-8 [612]. IL-8 or other chemokines released within tumors may have anticancer effects by recruitment of macrophages, granulocytes and lymphocytes. But there is also evidence that IL-8 contributes to tumor development and spread. In melanoma, IL-8 has been shown to be an autocrine growth factor [1737, 1833]. IL-8 stimulated tumor cell movement. Metastasis of melanoma cells in nude mice was correlated with the tumor’s capacity to produce IL-8 [1833]. Developing tumors require

180 adequate blood supply and may benefit from IL-8induced angiogenesis [994, 1905]. IL-8 secretion correlated with vascularity in human gastric cancer [976]. In a nude mouse model for human tumor progression, IL-8 was one of several angiogenesis factors that correlated with progression in ovarian cancer [2250]. Reduced IL-8 expression or blocking antibodies administered to nude mice decreased growth, invasiveness and angiogenesis in melanoma, breast cancer and transitional cell carcinoma cells [812, 966, 1299]. Therefore, IL-8 may act directly to stimulate tumor cells. Alternatively, IL-8 may activate neighboring normal cells to produce factors that tumors utilize for growth and metastasis.

Interleukin-9 Mast Cell, T Cell, Lymphoma Growth Factor; Inflammatory; Hematopoietic IL-9 is a 32–39 kDa, 144 amino acid protein. Its gene is located on chromosome 5 in a region near genes for GM-CSF, IL-3, IL-4 and IL-5. IL-9 is structurally related to IL-2, IL-4, IL-7 and IL-15 and some of their activities are similar. IL-9 was discovered as a factor in the medium of HTLV-transformed T cells that stimulated growth in a human leukemia cell line [2229]. IL-9 has also been referred to as P40 [2063, 2170], mast cell growth enhancing activity [1332] and T cell growth factor III [1748]. It is produced by activated Th2 cells [1634], by naive CD4+ cells [1747], and by mast cells [820]. In CD4+ cells, IL-9 secretion is stimulated by IL-1, IL-2, IL-4 and TGF-β and inhibited by IFN-γ [1745, 1746]. In mast cells, IL-1, IL-10 and kit ligand increase IL-9 secretion [820, 1899]. The receptor for IL-9 contains IL-9Rα and γc [968]. The signaling pathway involves Jak3, Jak1, the adaptor protein IRS-1 [2245] and the transcription factors STAT1, STAT2, and STAT5 [412, 116]. IL-9 usually acts together with other cytokines. With IL-3 or GM-CSF, IL-9 induced the growth of hematopoietic progenitor cells [784]. With erythropoietin, IL-9 supported erythroid colony (BFU-E) formation [447, 2170]. In mice, IL-9 with IL-2 stimulated fetal thymocyte proliferation [1917]. IL-9 increased growth in T cell lines and activated helper T cells [800]. Interestingly, quality of growth induced in certain Th cell lines by IL-9 was different from that of IL-2 in that IL-9 induced growth was hardly affected by glucocorticoids while IL-2-induced growth could be inhibited [1162]. IL-9 also increased granzyme B (protease involved in apoptosis and cytotoxicity) and high affinity receptors for

Cytokines IgE in several Th cell clones. These are mast cell-like characteristics that IL-9 induced in Th cells [1161]. In cultures of mast cells, IL-9 enhanced survival; IL-9 together with IL-3 and IL-4 stimulated mast cell growth and the secretion of IL-6 [819]. Proliferation of mast cells was one of the remarkable features of IL-9 transgenic mice [631]. In B cells, IL-9 potentiated IL-4induced immunoglobulin secretion [461]. IL-9 increased resistance to nematode infections [515]. Mice that oversecreted IL-9 showed increased allergeninduced inflammation and airway hyperresponsiveness [1279, 1977]. There is genetic evidence that IL-9 is involved in human asthma [451, 1450, 1460]. Related to cancer, IL-9 has been shown to stimulate growth and depress apoptosis in mouse lymphoma cells [1633, 2079]. Transgenic mice overexpressing IL-9 tended to develop lymphomas [1632]. HTLV-transformed T cells produce IL-9 [947]. IL-9 was an autocrine growth factor for cultured Hodgkin’s lymphoma and ReedSternberg cells [684]. It is possible that antagonists of IL-9 may be useful therapeutically.

Interleukin-10 Regulator of Immune Response IL-10 was first discovered in cultures of Th2 cells as a factor that inhibited IFN-γ production by activated Th1 cells [535]. It is a 17,000 mw protein with relatively little glycosylation [1177]. IL-10 is produced by several types of cells including regulatory T cells (Tr1 and nTreg) [2002, 2204], CD4+ Th2 cells [297, 535, 2262], thymocytes [1198], B cells [629, 1470], monocytes [423, 548], mast cells [1990], eosinophils [1416], and keratinocytes [494]. In CD4+ T cells, activation induces several cytokines including IL-2 as an early response and IL-10 as a relatively late regulatory response [332, 2262]. Blocking endogenous IL-2 prevented the increase in IL-10 [332]. IL-4, IL-7, IL-15 and IL-12 were costimulators of IL-10 production. IL-10 feeds back on the production of IL-2 and its own synthesis by deactivating T cells [332]. In macrophages, activation induced several cytokines including an early response for TNF-α (3.5 h) and a much later peak in IL-10 (48 h) [388, 423, 2116]. Cortisol (immunosuppressive) stimulated plasma IL-10 levels in treated normal volunteers [376]. IL-10 feeds back on its own production by deactivating macrophages and TNF-α secretion [388, 423, 2167]. The IL-10R structurally resembles the IFN receptor [773, 1014, 1869]. Signaling in monocytes and T cells

Walter M. Lewko and Robert K. Oldham involves tyk2, Jak 1, STAT1α, STAT3 and a different STAT3-like protein in monocytes, not observed in T cells [533]. IL-10 is a key regulator of immune response. A major effect of IL-10 is the suppression of Th1-dependent cellular immunity and the promotion of Th2-dependent humoral immunity [1347]. IL-10 deactivates a number of macrophage activities. It inhibits macrophage production of IL-12 and other cytokines that stimulate T cells [173, 369, 388, 536]. Further, IL-10 depresses macrophage production of peroxide [173] and nitrogen oxide [600]. In activated monocytes, IL-10 also inhibits the production of M-CSF. IL-10 regulates neutrophil activity. It inhibits endotoxininduced release of proinflammatory cytokines [920]. IL-10 depresses neutrophil production of MIP-1α, MIP-1β and IL-8 [920] and enhances the release of IL-1Ra [257]. IL-10 inhibits antigen presentation and T cell response [537]. In target cells, IL-10 down-regulates MHC class I [1243]. In monocytes, IL-10 depresses costimulatory and adhesion molecules involved in antigen presentation [2167]. IL-10 also inhibits dendritic cell-induced production of IFNγ by Th1 and CD8+ T cells [1188]. It decreases antigen presentation by macrophages to T cells, in particular, to Th1 cells [388]. IL-10 also depresses T cell growth directly [1942]. In mitogen stimulated T cells, IL-10 inhibits cell division and production of IL-2 and IFN-γ [1942]. In many ways IL-10 resembles IL-4, but interestingly, IFN-γ levels are stimulated by IL-4. This is the key difference in activities between IL-4 and IL-10 which otherwise act similarly as they tend to suppress cell mediated immune response. In NK cells, IL-10 depresses INF-γ secretion and cytotoxicity induced by IL-12 and TNF-α [2027]. In fibroblasts, IL-10 depresses the production of collagen, enhances the production of collagenase and stromelysin [1628]. In macrophages, it inhibits production of collagenase and stimulates the production of tissue inhibitor of metalloproteinases (TIMP) [1052]. As already noted, glucocorticoids, which are immunosuppressive, stimulate IL-10 levels in blood [376]. The overall effect of IL-10 is antiinflammatory and it tends to limit tissue damage associated with inflammation. IL-10 has been described as a growth and differentiation factor for CD8 T cells [297, 1198] and activated B cells [1687]. In T cells, IL-10 induced the IL-2R and thereby enhanced IL-2-dependent proliferation [1198, 331]. IL-10 is a chemotactic factor for CD8+ T cells (the first described) but it is an inhibitor of IL-8-induced migration for CD4+ cells [893, 895]. In a model for diabetes, IL-10 expression by islet cells caused the local accumulation of T cells [2181]. In B cells, IL-10 and

181 IL-2 acted together synergistically, as IL-2R levels were increased [547, 867]. IL-10 enhanced class II MHC expression [629] and stimulated the production of IgG, IgA and IgM [400, 867]. In B cells, IL-10 had opposite effects on apoptosis that appeared to depend on the activation state of the cells. IL-10 depressed apoptosis in germinal center B cells [1107] but it enhanced apoptosis in chronic lymphocytic leukemia B cells [546]. In Staphylococcus aureus-activated B cells, IL-10 added 3 days later inhibited apoptosis; when IL-10 was added at the time of S. aureus, apoptosis was stimulated [866]. In mast cells IL-10 acts together with IL-3 and IL-4, to stimulate growth [1990]. IL-10-deficient knockout mice exhibited a number of problems, in particular the mice developed enterocolitis due to unregulated immune response to microbes [1031]. IL-10 protects mice against the effects of endotoxin shock [613, 802]. Epstein Barr Virus genes code for vIL-10 (BCRF1). The protein is highly homologous with hIL-10 [806, 1348, 2076]. It appears that at some point in evolutionary time, EBV picked up this gene from a mammalian cell source. viral IL-10 is expressed soon after infection, within 2–3 h, whereas host IL-10 appears 20–30 h after infection. viral IL-10 expression interferes with antigen presentation and the antiviral immune response [423]. IL-10 functions during pregnancy. The uterus provides a site of immune privilege for the development of a fetus. Successful pregnancy is said to be a Th2 phenomenon [2127]. In an abortion-prone mouse model system, a defect in IL-10 production appeared to be responsible for fetal loss; treating the mice with IL-10 prevented fetal resorption [313]. The pregnancy hormone progesterone induces the production of IL-10 [709]. In human trophoblasts, IL-10 is an inhibitor of matrix metallopoteinase-9 production, a protease believed to have a role in parturition [1682]. IL-10 production in the placenta was shown to decrease at term. Lower IL-10 levels would allow the expression of MMP-9 during parturition and a shift from Th2 to Th1 immunity [709]. IL-10 may have a role in human diseases involving inflammation and inappropriate immune response. In volunteers treated with a single i.v. dose of IL-10, T cell levels were decreased. In endotoxin treated volunteers, pretreatment with IL-10 lowered fever and several proinflammatory cytokines [300, 1525]. IL-10 depresses lung granulocyte number and capacity for degranulation [1525]. IL-10 inhibits collagen production in fibroblasts. In patients with chronic hepatitis C, IL-10 normalized serum ALT (marker for hepatic inflammation), improved liver histology and reduced

182 fibrosis [1440]. Most patients with psoriasis benefited from treatment with IL-10 [77, 1627]. In Crohn’s disease, responses to IL-10 were observed in 23.5% patients. In another study, patients treated post surgically to prevent recurrence of Crohn’s disease did not show any benefit [336]. IL-10 treatments were well tolerated; observed toxicities, were moderate and reversible. In another approach, blocking antibodies to IL-10 were used to treat a small group of SLE patients. The patients were treated for 21 days; five/six patients benefitted from the antibody therapy [1142]. The immunosuppressive and antiinflammatory properties of IL-10 may be of value in tissue transplantation [125]. But it should be noted, certain mouse studies did not show any IL-10 benefit [1022]; in some cases IL-10 exacerbated graft vs. host disease [163]. Although IL-10 is generally antiinflammatory, it has certain proinflammatory effects, which may complicate its use in therapy. For example, one study showed that IL-10 potentiated IFN-γ release in LPS-treated volunteers [1066]. IL-10 may be elevated in cancer patients, naturally due to immune response or due to IL-10 production by tumors. Increased IL-10 could be involved in tumor growth and immune escape [882, 1173, 1574]. It has been shown that Epstein-Barr viral IL-10 is an autocrine growth factor for certain B cell lymphomas [121, 957]. IL-10 is also a growth factor for human myeloma cells, apparently by induction of a gp130 R dependent (e.g. LIF) process [689]. IL-10 may interfere with antigen presentation. Using antigen-pulsed DCs, repetitive vaccination induced CD4+ cells, which produced IL-4 and IL-10 [282]. IL-10 appeared to induce T cell anergy [282, 1173, 1934]. In tumor cells, IL-10 decreased expression of HLA class I, which would decrease recognition by effector cells [1243]. In Hodgkin’s disease, elevated IL-10 was determined to be an independent prognostic factor for treatment failure [174, 1727]. It thus appears IL-10 may have a role in tumor progression. It should be mentioned that during immunotherapy, IL-10 levels might rise [1996]. This could be a reason for lack of response. One might not expect IL-10 to be useful in a tumor vaccine. However, interesting results were obtained in mice vaccinated with mammary adenocarcinoma cells engineered to produce IL-10 [30, 624]. Some mice developed long term immunity. In another study, transgenic mice overexpressing IL-10 in antigen presenting cells rejected an immunogenic melanocytoma [678]. In another study, mice received tumor cells expressing both IL-10 and IL-12. 50–70% showed remission of metastases to lung, colon and breast tumors. Vaccination with

Cytokines cells expressing either IL-10 of IL-12 alone yielded little or no response. CD8 and CD4 cells were both involved and tumor specific antibodies were induced [677].

Interleukin-11 Hematopoietic Progenitor/ Thrombocytosis Stimulator; Regulator of Inflammation IL-11 was discovered as a factor produced by a bone marrow stromal cell line, which supported the growth of an IL-6-dependent plasmacytoma cell line [1543]. It is a 22 kDa glycoprotein [455, 456]. IL-11 is a member of the IL-6 cytokine family. It is produced by stromal cells in hematopoietic tissues [1543], fibroblasts [486, 1653, 2290], epithelial cells [485], chondrocytes and synovial cells [1200] and by airway smooth muscle cells [484]. IL-11 is induced by IL-1, TGF-β, histamine, eosinophil major basic protein and by certain viruses [484, 485, 481]. The receptor for IL-11 shares the gp130 subunit with receptors for the other IL-6 family members [1138, 1944]. IL-11 stimulates the growth and differentiation of hematopoietic progenitor cells and megakaryocytes [1404, 1405]. It influences very early stem cells and more committed precursor cells. In mouse cells, IL-11 acted synergistically with IL-3 and IL-4 to stimulate growth of primitive blast colony forming cells [1504, 1405]. IL-11 stimulates B cells and the production of immunoglobulin [1543, 2244]. IL-11 has a remarkable effect on platelet production and this is its main clinical use [456]. IL-11 inhibited the differentiation of fibroblast lines into adipocytes; IL-6 and TNF-α had similar effects [937]. IL-11 inhibited the production of IL-12 by macrophages [1104]. IL-11 is involved in bone metabolism; it is said to be critical for osteoclast development [625]. Also IL-11 is among the several cytokines capable of inducing acute phase protein release from hepatic and nonhepatic cells [1340]. IL-11 regulates Th2 responses and the production of inflammatory cytokines [2022, 2296]. IL-11 is secreted during respiratory tract infections, airway inflammation, and asthma [481, 1229, 2103] and certain other inflammatory responses such as Lyme disease [53]. IL-11 also ameliorates inflammatory bowel disease and oral mucositis [958]. IL-11 protects and restores damaged, inflamed tissue by the secretion of protease inhibitors [1202]. In an ovalbumin allergy model, lung overexpression of transgenic IL-11 decreased antigen-induced eosinophilia, inflammation and endothelial VCAM-1 in

Walter M. Lewko and Robert K. Oldham lung tissue. Th2 cytokines IL-4, IL-5 and IL-13 were diminished [2102]. IL-11 also has protective effects during radiationinduced thoracic injury [1623] and intestinal damage [455]. IL-11 protects against immune complex lung injury [1095] and oxygen-induced lung damage [2123]. In the care of cancer patients, IL-11 augments bone marrow recovery and platelet production. It is approved for use in patients with non-myeloid malignancies to prevent thrombocytopenia and to reduce the need for platelet transfusion following chemotherapy. It has been shown in breast cancer patients, for example, that treatment with rhIL-11 increased bone marrow megakaryocytes [1503]. Blood platelet counts were increased and patients experienced less thrombocytopenia [645]. In patients with thrombocytopenia requiring platelet transfusions, treatment with rh-IL-11 significantly decreased the need for transfusions with subsequent chemotherapy [1978]. RhIL-11 is well tolerated by adults and children. Adverse events are generally mild or moderate and reversible [1843]. Il-11 may have a role in progression of breast cancer. IL-11 and its receptors were higher in tumors than normal tissue and higher in node positive tumors than node negative tumors. Higher expression of IL-11 in tumors was linked to poorer survival of patients [708]. IL-11 also induces the formation of osteoclasts, which appear to be involved in the metastasis of breast cancer to bone [918, 1353, 1830].

Interleukin-12 Immune Stimulation, Inflammation, Hematopoiesis, Regulator of Innate and Adaptive Immunity IL-12 is a key cytokine with far reaching influences. It serves as a link between the innate and adaptive immune response systems [993, 2025, 2186]. IL-12 is a well studied cytokine. It was reviewed in some detail in a previous edition [1110]. The following is a brief overview with a discussion of certain new reports related to cancer. IL-12 was discovered in B cell lines as a factor, which acted with IL-2 to stimulate proliferation, IFN-γ secretion and cytotoxicity in NK cells and T cells [596, 737, 1149, 1560, 2054]. It has been referred to as natural killer cell stimulating factor [993], T cell stimulating factor-1 [649], and cytotoxic lymphocyte maturation factor [1891]. IL-12 is a 70,000 mw glycoprotein; it is composed of two chains, α (also called p35) and β (p40)

183 [680]. These chains are produced from two distinct genes, on separate chromosomes [680, 1822]. The α subunit has homology with IL-6 and G-CSF [1293]. The β subunit is unusual in that its structure is more like that of a receptor than a cytokine [603]. Expression of these two genes does not appear to be coordinated. Curiously, many cells in the body produce the α subunit without making β [368]. But both chains must be transcribed within the same cell for the production of active IL-12 [2185]. Regulation of IL-12 secretion generally occurs at the level of β chain synthesis [368] though this wasn’t the case in DCs prepared from newborns where low IL-12 production appeared to be due to lack of the α chain. Low DC IL-12 may be one reason why newborns have relatively poor cellular immune response [646]. Mouse cells secrete an IL-12 β-β homodimer that acts as a physiological antagonist of IL-12 [1252, 595, 731]. It is not clear whether the β-β homodimer has a function in humans. IL-12 is produced by macrophages, dendritic cells, neutrophils, microglial cells, keratinocytes and transformed B cells [368, 1189, 804, 1608]. IL-12 is not typically secreted by tumors except certain cancers of B cells origin [2185]. IL-12 production in macrophages is stimulated by bacteria, viruses, parasites [368, 804, 2185] and by contact with T cells through CD40–CD40L interaction [1817]. IL-12 production is enhanced by IFN-γ (Th1 cytokine) and inhibited by IL-10, IL-4 (Th2 cytokines), TGF-β and IFN-α/β [2108]. IL-12 receptor contains two chains, IL-12Rβ1 and IL-12β2. They have homology with the β chain (gp130) of the IL-6R family [318]. Both subunits are required for IL-12 function. β1 is responsible for binding. β2 is the subunit that signals [2200, 2201]. IL-12R is expressed mainly on NK cells and T cells [416]. It is not expressed on Th2 cells [1939]. In PBMC, IL-12R was upregulated by activation with PHA or IL-2 [416]. IL-12R signaling involves Tyk2, Jak2, STAT3 and STAT4 and p38 MAPK [97, 326, 873, 2282, 2303]. IL-12 promotes the development of cellular immune response. It does this by stimulating the production of IFN-γ and Th1-related cytokines in PBL, T cells and NK cells [284, 317, 824, 993, 1028, 1283, 1284, 1554, 2202]. IL-12 also stimulates hematopoiesis. It acts on progenitor cells together with growth factors such as GM-CSF [130, 1431, 1432, 1433]. IL-12 increases DC production of cytokines (GM-CSF, IL-1β, IL-6, IL-12, TNFα and IFN-γ) and antigen presentation [675, 1028, 1412]. IL-12, together with IL-2, stimulates the growth and differentiation of B cells [885]. IL-12 induces LAK cells when added to cultures of PBLs for 3–5 days. LAK cells are also induced by IL-2. At least part of the IL-2

184 effect on LAK appeared due to IL-12 for antibodies to IL-12 decreased the response [597, 1431]. In anti CD3 activated TIL, IL-12 stimulated growth and tumor cell lysis [50]. The effect of IL-12 was not prevented by antibodies to IL-2. When IL-12 was added to cultures with a low, suboptimal dose of IL-2, there was an additive effect on growth and cytotoxicity [50]. Growth induced by IL-12 alone was transient. Maintenance of growth after 72 h required IL-2. IL-2 appears to be more potent than IL-12. It remains to be seen whether IL-12-treated TIL cells have added clinical benefit. IL-12 appeared to be involved in inflammatory diseases such as multiple sclerosis, diabetes, and arthritis [2025]. However, more recent studies suggest IL-23, which is proinflammatory and structurally related to IL-12, may be responsible for certain effects attributed to IL-12, specifically in experimental allergic encephalitis. Further, IL-12 may be more regulatory, suppressing TNF and other proinflammatory cytokines [2279]. IL-12 secretion by antigen presenting cells may be responsible for differences in immune response between females and males [2161]. Females tend to have more vigorous humoral and cellular immunity. Females also have a higher incidence of autoimmune disease. An interesting study showed that activated AP cells from SJL female mice secreted IL-12 but not IL-10 and favored Th1 response. These female mice suffered a high incidence of experimental allergic encephalomyelitis. In males, AP cells produced IL-10 but not IL-12 and had a much lower susceptibility to the disease. Castration or estrogen treatment increased IL-12, decreased IL-10 and increased the incidence of this autoimmune disease [2161]. Anticancer activity of IL-12 may be related to any of a number of direct or extended effects that this cytokine has on Th1 differentiation, CTLs, dendritic cells, macrophages, NK cells, NK T cells, and vascular endothelial cells [1848]. IL-12 induces several cytokines; IFN-γ is a major down stream mediator of IL-12 antitumor activity [1898, 2297]. As a single agent, IL-12 inhibited a number of mouse model tumors [216, 1425]. Mice bearing B16 F10 melanoma, M5076 sarcoma and Renca renal carcinoma benefitted from treatment with IL-12. The antitumor effect did not require NK cells but did depend on T cells, specifically CD8+ T cells [216]. Mice with sarcomas, treated with IL-12, showed decreased tumor growth, increased longevity and in some cases complete regressions. Interferon γ was required for the IL-12 effect and it appeared to be mediated by CD4+ and CD8+ T cells [1425]. Downstream the chemokine IP-10 (interferon inducible protein) was responsible for

Cytokines IL-12-induced, CD8+ mediated immunity to mouse neuroblastoma [1559]. In mice with brain tumors, IL-12 induced a T cell response, decreased tumor size, and prolonged survival time [1690]. These studies suggest that systemic IL-12 may be of benefit in the treatment of CNS cancers. Several studies have shown that IL-12 inhibits angiogenesis in tumors [249, 349, 460, 606, 1898, 1964]. The process involves a complex interaction between several types of cells. IL-12 does not appear to act directly on endothelial cells [460, 1898]. Rather IL-12 induces IFN-γ, which in turn induces IP-10 and Mig; these two chemokines act directly on endothelial cells, to induce vascular damage, clotting and tumor necrosis [52, 64, 350, 1874, 1898, 1964]. Vasostatin is another antiangiogenic factor. In nude mouse studies, treatment with vasostatin or IL-12 inhibited tumor growth. Together they effectively blocked Burkitt’s lymphoma, colon carcinoma, and ovarian carcinoma [2230]. IL-12 engineered cells show promise as anticancer vaccines. IL-12 transfected tumor cells [264, 1152] or fibroblasts [2299] inhibited the growth of some established tumors and induced the rejection of subsequent tumor implants. In a model using an MHC I negative small cell lung cancer growing in nude mice (no capacity for CTL response), cells engineered to produce both IL-15 and IL-12 did not grow; coinjected wild type tumor was also rejected. This study showed that IL-12 could stimulate innate antitumor immunity and that macrophages appeared to be involved [427]. Dendritic cells transfected by bombardment with DNA-coated gold particles containing genes for tumor antigens express antigen and presented it. Co-transfection of these dendritic cells with IL-12 or IFN-α consistently enhanced the induction of specific CTLs in vaccinated mice [2039]. IL-2 and IL-12 interact; receptors are mutually stimulated [416] and they have additive or synergistic effects on NK cells [394], T cells [596, 1284] and macrophages [2157]. Administration of IL-12 with pulse IL-2 induced complete regression of established mammary carcinoma in treated mice [2158]. IL-12 has also been reported to potentiate the effects of tumor cell vaccines engineered to secrete IL-2 for colon cancer [2048] and glioma [981]. Time-release microcarriers have been used to deliver a single dose of adjuvant IL-12 by intratumoral injection. IL-12 alone and especially with GM-CSF, activated T effector/memory cells, killed regulatory T cells and increased CD8+ effector cells. Elimination of suppression and development of cytotoxic T lymphocytes eradicated metastatic tumors [960].

Walter M. Lewko and Robert K. Oldham The preclinical studies with IL-12 were quite encouraging. This cytokine had many effects similar to those of IL-2 and appeared to be less toxic. For these reasons and others, IL-2 and IL-12 may prove to be effective in combination or sequential biotherapy. Similarly, IL-12 gene insertion may prove an effective strategy for increasing tumor immunogenicity. Finally, ex vivo expansion of T cells with IL-12 in addition to IL-2 might be rendered more specific and more cytolytically effective. Studies from our laboratory and others indicate that IL-12 is effective in stimulating cytolytic populations of tumor derived T cells and may be of benefit in the development of T-cell based therapy. There have been several reports on phase I/II studies using IL-12. Patients with cutaneous T cell lymphoma, injected with rhIL-12, had a response rate (CR + PR) of 50% [1661]. IL-12 has also been tested in patients with renal cancer [84, 635, 1379, 1484, 1588, 1650], melanoma [84, 635, 1075, 1367, 1650, 1928] and ovarian cancer [829, 1096]. IL-12 has been used in combination with Herceptin in breast cancer patients [1534] and with IFNα2b in with renal cancer and melanoma patients [832]. Vaccination studies have been carried out using IL-12 as an adjuvant with peptide-pulsed antigen presenting cells [581] and using transfected, IL-12-secreting autologous tumor cells [1928]. Patients have also been injected intratumorally with transfected, IL-12-secreting fibroblasts [917]. Collectively, these studies showed that IL-12 induced immune response; NK cell and specific CTL activities were increased and serum cytokine levels were elevated, in particular, IFN-γ. Toxicities were significant but manageable. Lymphopenia was the most common problem. Clinical activity was observed but the response rates were disappointingly low (generally less than 10%) and not durable. In order to improve the response rate, IL-12 may have to be administered in combination with other cytokines, IL-2 for instance [635].

Interleukin-13 Regulation of Inflammation; Allergy IL-13 is a Th2 cytokine that has a role in parasite infections, allergy and the regulation of inflammation. Recombinant IL-13 has a molecular weight of about 14,000. It is related to IL-4 [1274, 2310]. Activated Th2 CD4+ T cells, CD8+ T cells [908, 1275, 1315, 1597], mast cells [225], eosinophils [2180], basophils, dendritic cells and certain B cell lines produce IL-13. The gene of IL-13 is located on human chromosome 5 together with genes for IL-3, IL-4, IL-5 and IL-9 [1271].

185 The receptor for IL-13 has two subunits, IL-4Rα and IL-13Rα1 [741, 758]. This complex also binds and responds to IL-4. Signaling involves Jak1 and Tyk2 [943, 944]. In addition, there is IL-13Rα2, which may be soluble or membrane bound [244, 445, 1940]. The soluble form appears to be a non-signaling decoy receptor [2197]; the membrane bound form may have certain functions [302, 531]. IL-13 appears to have remarkable effects on T cells; Th2 cells are stimulated and Th17 cells are inhibited. But the receptor for IL-13 is not found on T cells; these effects of IL-13 must be indirect. In DC for example, IL-13 inhibits expression of IL-6, a key factor necessary for Th17 differentiation [985, 1276, 2310]. In monocytes, IL-13 is anti-inflammatory and pro-allergy. IL-13 decreased production of several pro inflammatory cytokines including IL-1α, IL-1β, IL-6, IL-8, IL-10, IL-12, GM-CSF, G-CSF, MIP-1α, TNF-α, GROα and prostaglandin E2 [422, 1315, 1598, 2198]. IL-13 also inhibited antibody-dependent cell-mediated cytotoxicity [422]. IL-13 caused remarkable changes in monocyte phenotype and adherence. It stimulated levels of complement receptors CD11b and CD11c. IL-13 also stimulated MHC class II levels. IL-13 increased CD23 (an IgE receptor). IL-13 also increased CD49e and CD29, which together form VLA5 (integrin α5β1, a fibronectin receptor) [162]. IL-13 depressed levels of CD64, CD32 and CD16 (IgG receptors) [422]. IL-13 decreased CD14 (LPS receptor) [162, 339]. IL-13 protected animals from the lethal effects of LPS-endotoxemia [1382]. IL-13 increased production of IL-1 receptor antagonist [422, 1408]. IL-13 is also a potent suppressor of nitric oxide production in activated macrophages, epithelial cells and mesangial cells [139, 172, 286, 1733]. IL-13 does this by regulating levels of nitric oxide synthase and substrate arginine available for production [286, 1733]. Further, IL-13 inhibited the production of HIV-1 virus in cultured human macrophages [1343]. In B cells, IL-13 increased proliferation, the synthesis of immunoglobulin, and IgE class switching [328, 398, 1275, 1597]. IL-13 also enhanced the expression of MHCII and CD23 (an IgE receptor) [1277]. Essentially all of these effects of IL-13 in B cells are similar to those of IL-4. IL-13 has various additional activities. In neutrophils, IL-13 induced the secretion of interleukin-1 receptor antagonist [337]. IL-13 also stimulated the production of IL-6 in human keratinocytes [415] and in human microglial cells [1773]. In NK cells, IL-13 induced the production of IFN-γ and cytotoxicity [1315]. IL-13 is a chemotactic factor for human osteoblasts [1131]. In endothelial cells, IL-13 stimulates production of VCAM enhancing T cell adhesion [620]. IL-13 is a chemoattractant for monocytes

186 [1200] and stimulates production of monocyte chemoattractant protein-1 in vascular endothelial cells [633]. IL-13 is involved in inflammatory diseases. IL-13 regulates rheumatoid arthritis. Cultured explants of synovial tissue from patients contained elevated levels of IL-1β, TNF-α and PGE2. Transfection with IL-13 depressed the production of these inflammatory factors [2198]. While IL-13 is generally antiinflammatory, it does have certain proinflammatory effects. IL-13 has a central role in the development of allergic asthma [681, 2175]. IL-13 is a Th2 cytokine. It fosters humoral immune response and the production of IgE. Bronchoalveolar lavage cells from asthmatic patients challenged with ragweed allergen produced high levels of IL-13 [813]. Antigen stimulated CD4+ cells of patients with allergic rhinitis produced more IL-13 compared to normal controls. There are some reports on IL-13, relating to cancer. Renal cell carcinomas produce IL-13 and IL-13R [1474]. Addition of IL-13 to the medium of cultured cells inhibited growth up to 50% [1475]. Human glioma cells contained unusually high levels of the IL-13R. Tumor growth was inhibited by an IL-13-exotoxin conjugate [393, 830]. IL-13 is angiogenic. It stimulated the formation of vessel-like structures from endothelial cells in collagen culture and in vivo it stimulated outgrowth of vessels in the rat cornea assay [574, 703]. The mechanism appeared to involve the production of VCAM, which in its soluble form is angiogenic. IL-4 is used together with GM-CSF for in vitro production of dendritic cells in human vaccination studies. IL-13 substitutes for IL-4 in the production of dendritic cells [33]. It remains to be seen whether IL-13 may be of advantage in the development of anticancer vaccines.

Interleukin 14 B Cell Development and Memory IL-14 was discovered in the conditioned media of Burkitt’s lymphoma cell lines. It was originally referred to as high molecular weight B cell growth factor (HMWBCGF) [39–41]. It is a rather large glycosylated protein with a variable mw of 53–65 kDa, depending on carbohydrate content [42]. IL-14 is produced by PHA stimulated CD8+ T cells, CD4+ T cells (Th1 and Th2), NKT cells, follicular dendritic cells [342, 1704] and B cell lymphomas [552, 553]. Its mRNA has been detected in unstimulated vascular endothelial cells [1455]. IL-14 stimulates B cell growth and differentiation [39, 41]. It also appears to induce and maintain B cell

Cytokines memory [40, 1479]. Mice that were transgenic for IL-14 developed autoimmunity and B cell lymphomas, which resembled systemic lupus in patients [1803]. IL-14 is secreted by B cell malignancies and may have a role in the development of these diseases [552].

Interleukin 15 NK Cell Activity, Maintenance of T Cell Memory IL-15 was discovered as a factor in culture media of monkey kidney epithelium that supported IL-2 dependent growth in a T cell line. The same factor was identified in a human bone marrow stroma cell line [647]. IL-15 was also discovered independently, as the factor IL-T in a T cell leukemia cell line [108, 228]. IL-15 is a 14–15 kDa, 114 amino acid protein. It a member of the four α helix bundle cytokine family to which IL-2 belongs [647]. Many of its activities are similar to those of IL-2. While IL-2 is produced mainly by activated T cells, IL-15 is produced by a rather wide variety of cells types including peripheral blood mononuclear cells, epithelial cells, fibroblasts, placenta, skeletal muscle, heart, lung, liver, kidney [647], and keratinocytes [1334]. IL-15 was not detected in activated T cells [647]. While IL-2 synthesis is regulated at the level of transcription and mRNA stability, IL-15 is regulated at the translational level [107] which is less common but has been shown to occur for certain cytokines (e.g. IL-1β, TNF-α, TGF-β3, TGF-β1, GM-CSF). A pool of mRNA, readily available for translational activation, may allow rapid production of IL-15 when required, as in response to an intracellular infectious agent [107]. The IL-15R is composed of three subunits: IL-15Rα, IL-2Rβ and γC. The β and γc subunits are shared with IL-2 receptors; IL-2 and IL-15 have similar signaling patterns and cytokine activities [626]. And although the IL-15Rα chain binds IL-15 specifically, it is structurally related to IL-2Rα [46, 627]. IL-15R is expressed in a greater variety of cell types than the IL-2R [46, 627]. Interestingly, mast cells respond to IL-15; they have a different IL-15 receptor and signal transduction pathway [1945]. There is a soluble form of the IL-15Rα chain. It is released from cells by proteolysis. It binds IL-15 with high affinity and it acts as an IL-15 antagonist [1369] There is evidence that IL-15 can exist in a membrane-bound form, which is capable of reverse/bidirectional signaling when engaged by its receptor.

Walter M. Lewko and Robert K. Oldham This membrane bound IL-15 was upregulated in monocytes by IFN-γ [219]. IL-15 stimulates proliferation and differentiation of NK cells, B cells, and T cells. Knockout mice lacking IL-15Rα were deficient in NK cells, NK-T cells, CD8+ T cells and γδ T cells [1145, 1457, 2172]. In NK cells, IL-15 stimulated differentiation and activation [249, 1145, 1381, 1477, 2172]. IL-15 upregulated expression of NKGD2 receptors, which are involved in antitumor activity [1930]. IL-15 is also chemotactic for NK cells [29]. In B cells, IL-15 stimulated proliferation and secretion of IgM, IgG, and IgA [71]. In activated cytotoxic T lymphocytes, it increased growth and cytotoxicity [617]. IL-15 stimulated the growth of an IL-2 dependent CTL cell line [228]. IL-15 has been shown to rescue tolerant CD8+ T cells for use in adoptive anticancer therapy [1975]. IL-15 also increased growth and activity of γδ T cells [591, 1457]. IL-15, like IL-2, induced formation of LAK cells in cultures of peripheral blood lymphocytes [228, 617]. In primary cultures of tumor infiltrating lymphocytes, IL-15 replaced IL-2, inducing outgrowth and cytotoxicity of tumor derived activated T cells (TDAC) [1111]. In TDAC cultures that were initially induced with IL-2 and dependent on IL-2 for growth, IL-15 could replace IL-2 for the maintenance of growth [1111]. With increased awareness of the importance of IL-2 in Treg immunosuppressive function, there has been consideration for replacing IL-2, in the development of CTL for immunotherapy, with IL-15 alone or in combination with IL-21 [56, 2275]. IL-15 is synergistic with IL-12 in the induction of mouse Th1 clones [92]; IL-15 appears to have a strong pro-Th1 tendency. In transgenic mice, overexpression of IL-15 augmented Th1 response to infection with intracellular bacterium [1457]. Increased IL-15 is associated with inflammatory diseases including rheumatoid arthritis [1268, 1692], pulmonary sarcoidosis [12], multiple sclerosis [982] and inflammatory bowel disease [972, 1715]. On the other hand, IL-15 has been shown to inhibit allergy. IL-15 overproduction in transgenic mice had a negative effect on the development of allergic asthma, a Th2 disease; IL-15 depressed pulmonary eosinophilia and the production of Th2 cytokines [860]. But it should be noted IL-15 may have some pro Th2 effects; in mice primed with dust mite allergen, IL-15 stimulated IL-5 production by allergen-specific human Th2 clones and resulting eosinophil activation [1354]. While similar in function, there are differences between IL-2 and IL-15. IL-2 has a role in tolerance by inducing T cell suicide [1710, 1933, 2168], in activation-induced T cell death [1092, 1626, 2062] and it is involved in the inhibition of T cell memory maintenance

187 [1026]. On the other hand, IL-15 has anti-apoptotic effects [223] and increases the survival of CD8+ memory cells [1026, 2284]. In mast cells, IL-2 has little or no effect while IL-15 stimulates growth and response to IL-3 and stem cell factor [1945, 2091]. Human T cell lymphotropic virus codes for tax protein; when T cells were infected, tax expression increased the production of IL-15 [94, 95] and IL-15Rα [1227]. IL-15 appears to be responsible for the abnormal proliferation of T cells associated with infection by this virus [95]. The anti-apoptotic effects of IL-15 may have a role in psoriasis, a chronic proliferative inflammatory skin disease. Keratinocytes produce IL-15 and the IL-15 R. Compared with normal epidermis, biopsies of psoriatic skin lesions were high in IL-15 and IL-15 binding capacity [1693]. Cellular immunity is responsible for allograft rejection. A study showed that blocking the effects of IL-15 using soluble IL-15Rα chain prolonged the survival of heart grafts. This indicated that IL-15 has a role in graft rejection and that IL-15 antagonists may be therapeutically useful in the treatment of graft recipients [1845]. In a nude mouse xenograft tumor model, MHC I negative small cell lung cancer cells, engineered to secrete IL-15, grew more slowly and had a slightly reduced take rate; tumors were infiltrated with NK cells and the depletion of NK prevented the antitumor effect. Interestingly, when engineered to secrete both IL-12 and IL-15, the tumors were completely rejected, as were coinjected wild type tumors. Tumors were infiltrated with macrophages, NK cells and granulocytes. Activated macrophages appeared to be the major effector cells [426]. It has also been shown that in NK cells, IL-15 potentiates IL-12-induced secretion of IFN-γ, MIP-1, and IL-10 [521]. These studies show the importance of natural immunity and the synergistic action of IL-15 and IL-12 in the process. And in adoptive immunotherapy, Certain tumors express IL-15R and are candidates for cytokine-based therapies. An antibody (Mikbeta1) to the IL-2/IL-15β subunit has been tested in Phase I and found not beneficial in T cell large granular lymphocyte leukemia [1363].

Interleukin-16 Chemoattractive; Proinflammatory; Immunoregulatory; Anti-HIV IL-16 was originally described in 1982 as the lymphocyte chemoattractant factor (LCF) secreted by mitogenstimulated peripheral blood mononuclear cells [268,

188 270, 360]. IL-16 is produced mainly by CD8+ T cells. It is also produced by CD4+ T cells [2205], B cells [921, 1797], fibroblasts [1770], eosinophils [1129], mast cells [1697], dendritic cells [922] and epithelial cells [70]. IL-16 is also secreted by brain tissue; it may have a role in the interaction between the immune and nervous systems [1038]. IL-16 is synthesized as a proprotein. Nascent IL-16 lacks the usual signal peptide found on most secreted proteins [102]. This lack of a signal peptide is also a characteristic of IL-1 [89], IL-18 [1488] and FGF [3, 884]. Pro-IL-16 is cleaved to its active form by caspase-3, an enzyme in the same family as caspase 1 (ICE) which is responsible for the activation and secretion of IL-1β and IL-18 [2286]. Regulation of IL-16 release depends on the cell type. CD8+ T cells produce IL-16 constitutively and store it in the active form; histamine, serotonin, mitogen and antigen stimulate IL-16 release [271, 1047, 1048]. CD4+ cells, on the other hand, store inactive pro-IL-16; T-cell activation increases caspase-3 activity, pro-IL-16 processing and the secretion of active IL-16 [2203]. In bronchial epithelial cells, histamine, IL-1β and TNF-α stimulate secretion. Dexamethasone inhibits secretion; regulation of IL-16 may be part of the glucocorticoid antiinflammatory effect [70]. In fibroblasts, IL-16 mRNA is produced constitutively. Inflammatory cytokines such IL-1β induce the release of active IL-16 by a caspase-3 dependent mechanism [1770]. The amino acid sequence for IL-16 is distinct; it has little or no homology with other known cytokines. The monomer of IL-16 appears to be inactive; it aggregates to form a 56,000 mw tetramer, which is the active cytokine [102, 359, 360, 2286]. The C-terminal region is particularly well conserved between species and appears to be the region most critical for cell binding and activity [102, 941]. Interestingly, the N-terminal prodomain cleaved from pro-IL-16 by caspase-3 has a cellular function. It translocates into the nucleus and induces G0/G1 arrest, regulating cell division [269, 1631, 2287]. CD4 appears to be the primary receptor for IL-16. Cells that respond to IL-16 invariably express CD4. Anti-CD4 Fab fragments inhibit signaling by IL-16 [270, 358, 359, 360, 361, 1618]. Transfection of CD4 cDNA into CD4−cells enabled the cells to respond to IL-16 [358, 361]. The absence of CD4 in a mutant clone eliminated IL-16 response [1191]. IL-16 binds cell surface CD4 and induces signaling [1021, 1700]. A peptide of IL-16, based on the proposed CD4-binding sequence, blocked IL-16-induced chemotaxis in cultured splenocytes and decreased airway hyperresponsiveness in peptide-treated mice [385]. HIV-1 (gp120) binds CD4

Cytokines and inhibits chemokine signaling. In migrating lymphocytes, IL-16 induces protein kinase C; PKC inhibitors block migration induced by CD4 engagement [1532]. In macrophages, signaling involved the phosphorylation of two MAP kinase family members: the stress activated protein kinase/Jun N-terminal kinase (SAPK/JNK) and p38 MAP kinase. These two pathways are commonly activated by environmental stress signals such as UV irradiation and by certain other proinflammatory cytokines such as IL-1 and TNF-α [1021]. In T cells, the binding of IL-16 to CD4 resulted in activation of the src family tyrosine kinase p56 lck, which is associated with CD4 [1700]. In NK cells that expressed CD4, ligation induced cytokine secretion and cell migration [141]. The data favoring CD4 as the receptor are strong. But there is evidence in knockout mice genetically lacking CD4, that IL-16 was in fact still capable of inducing cytokine production and lymphocyte migration [1239]. In a mast cell line that lacks CD4, IL-16 mediated chemotaxis and signaling in a manner that could be blocked by antibodies to CD9. This suggested that CD9, a cell surface protein known to be involved in migration and cell adhesion, serves as an alternative receptor for IL-16 [1604]. IL-16 influences several cell types. The major effect is chemoattraction but it also has effects on immune response and HIV replication. IL-16 responsive cells are typically CD4 positive [269, 271]. IL-16 sensitive cells include CD4+ T lymphocytes [270, 357, 359, 1532], monocytes [357, 739, 1240], dendritic cells [739, 921, 922, 411], eosinophils [1618], mast cells [1604] and, interestingly, brain cells that are also CD4+ [1038]. In resting T-cells, IL-16 induced signaling and activation with migration and increased IL-2 receptor levels [357, 358, 360, 1532, 1700, 1981]. Several chemotactic agents induce migration in both CD4+ and CD8+ T cells; IL-16 is specific for CD4+ cells [2271]. It modulates and desensitizes certain chemokine receptors, thereby orchestrating T cell recruitment [1613]. Further, IL-16 appears to prime CD4+ cells for IL-2 and IL-15-induced growth [357, 1532]. IL-16 has several roles during antigen presentation. In monocytes and macrophages, IL-16 induced migration and the secretion of several cytokines including IL-1β, IL-6, IL-15 and TNF-α [1240]. In DC’s and macrophages, IL-16 stimulated levels of CD25 (IL-2R) and the costimulatory molecules CD80 and CD83 [739]. Further, IL-16 may act together with thrombopoietin during DC development to induce tolerogenic dendritic cells capable of inducing anergy in T cells [411]. And in lymphnodes, resident B cells and DC’s produce IL-16

Walter M. Lewko and Robert K. Oldham involved in the trafficking of Th cells and inward migration of additional dendritic cells [921, 922]. Delayed type hypersensitivity is mediated by antigen specific Th cells and involves cell movement. The role of IL-16 in DTH was studied in mice [2255]. IL-16 was expressed in DTH tissues but not in controls. Extracts of DTH tissue exhibited chemoattractant activity and IL-16 neutralizing antibodies inhibited this activity. When mice were pre-treated with antibodies, swelling, leukocyte infiltration and chemokine levels associated with DTH were depressed. These results suggested IL-16 had an important role in the recruitment of leukocytes and secretion of cytokines associated with DTH reactions [2255]. While IL-16 stimulates immunity it also has regulatory effects. CD4 is part of the TCR/CD3 complex responsible for antigen-induced activation of T cells. HIV-1 gp120 and antibodies that bind CD4 tend to interfere with activation [1476]. IL-16 also has immunosuppressive effects. It inhibited mixed lymphocyte reactions, deactivated T cells and lowered IL-2 secretion [1686]. Other studies have shown that skin cells transfected with IL-16 were immunosuppressive suggesting that IL-16 might be used to prevent graft rejection [572]. IL-16 induces migration and it also appears to regulate migration. When IL-16 bound CD4, there was a selective loss of chemokine receptor 5 activity. The two receptors were mutually inactivating. When MIP-1β bound CCR-5, T cell migration induced by IL-16 was inhibited. HIV-1 gp120 also appears to inhibit chemokine receptor signaling [1235]. IL-16 is one of several factors secreted by CD8+ T cells, which inhibit viruses. (Others antiviral factors include MIP-1α, MIP-1β and RANTES). Specifically, IL-16 interferes with HIV-1 replication in T cells [43, 103, 1191, 1734, 2294, 2295], macrophages and dendritic cells [2028]. The mechanism of inhibition appears to involve the interaction of IL-16 with CD4. A factor is produced which binds the core enhancer DNA, inhibits HIV-1 promoter activity and as a result blocks viral replication [1191]. IL-16 also blocks HIV-1 uptake by the cells [2028]. Decreased virus entry may be due to IL-16-induced CD-4 downregulation [739]. In a clinical study, HIV-1 infected patients were followed over an 8 year period. During the asymptomatic phase, serum IL-16 levels were maintained or increased. With disease progression, there was a drop in IL-16 [43]. These results support a natural role and potential therapeutic benefit of IL-16 in the control of HIV infection. IL-16 is involved in the development of several inflammatory diseases. IL-16 levels were elevated in fluid and tissue samples from patients with systemic

189 lupus erythematosus, asthma, inflammatory bowel disease and Crohn’s disease [1076, 362, 750, 942, 1236, 1049]. In related animal models, blocking antibodies to IL-16 ameliorated these diseases. On the other hand, IL-16 appeared to regulate inflammatory cytokines in a rheumatoid synovitis mouse model [986]. The synovial infiltrate contained activated CD4+ T cells secreting the proinflammatory cytokines IL-1β, IFN-γ, and TNF-α. CD8+ T cells produced a factor, which lowered the inflammatory cytokines. Anti IL-16 antibodies blocked the effects of this factor while treatment with rIL-16 mimicked the factor. It appeared that CD8+ T cells might have anti-inflammatory effects, which are at least in part mediated by IL-16 [986]. IL-16 has not been extensively studied in cancer. Nonetheless, its involvement in the activation and migration of several cell types including CD4+ T cells, dendritic cells and macrophages suggests it may have a role in antigen presentation, the development of tumor infiltrating lymphocytes and anticancer vaccination. Its antiviral effects may block HIV-related cancers.

Interleukin-17A Proinflammatory, Hematopoietic, Neutrophil Development The IL-17 cytokine family has six members. IL-17A, the first discovered, is a 155 amino acid, 20 kDa glycoprotein [555, 2232]. IL-17 family members have little or no homology with cytokines outside the family [555, 2232]. The gene is on chromosome 2q31. IL-17A was originally referred to as CTL-associated antigen-8 (CTLA-8) [1688]. Herpesvirus saimiri encodes a similar protein [2231]. IL-17 is produced by CD4 T cells, CD8 T cells and γδ T cells [1, 951, 555, 1144, 2232]. Bacterial endotoxin, IL1β, IL-6, IL-18, IL-23 and TGF-β stimulate IL-17A production [852, 1325, 712]. IL-17A is produced primarily by CD4 T-cells that are now referred to as Th17 cells [718]. These cells along with Th1, Th2 and Treg cells are major controllers of immune response. It is now believed that Th17 cells are responsible for many autoimmune diseases that were originally classified as Th1 diseases. The discovery of Th17 cells solved a problem in the observation that mice lacking the Th1 cytokine IFNγ suffered more, not less, autoimmunity than controls. The development of Th17 lineage appears to have two phases. In the first phase, Th0 cells differentiate into Th17 cells in response to TGFβ and IL-6 (or IL-1β; a proinflammatory signal is needed) and then there is an expansion/survival phase,

190 which is stimulated by IL-23. Th17 differentiation is inhibited by IL-2 and IFNγ (type 1 cytokines), IL-4 and IL-13 (type 2 cytokines), and IL-35 (Treg cytokine) [149, 718, 985, 1025, 1218, 1451, 1536, 2070]. Receptors for IL-17 have been found in most tissues tested. There are at least five members of the IL-17 receptor family. These receptors have little or no homology to other known cytokine receptors [2231, 2233, 1370]. IL-17 functions in host defenses against infection. Bacterial products induce IL-17 secretion [852]. IL-17 is required for defence against several types of infection, for example, bacterial pneumonia [2236]. IL-17 is involved in hematopoiesis. It appears to promote recovery in response to radiation damage [1961]. IL-17 is involved in inflammation. It stimulates production of molecules such as proinflammatory cytokines, chemokines, CSFs, prostaglandin, MMPs, NOS and antimicrobial peptides in a variety of cells including macrophages, fibroblasts, epithelial cells, keratinocytes, endothelial cells, mesothelial cells and dendritic cells [231, 513, 555, 1768, 878, 890, 1980, 2178]. IL-17 has particularly remarkable effects on neutrophil production and tissue infiltration. IL-17-treated fibroblasts release CSFs that stimulate neutrophil differentiation [555]. In transgenic mice that produced excess IL-17, there was enhanced hematopoiesis in general and granulopoiesis in particular. Peripheral WBC counts increased fivefold and neutrophils increased tenfold [1766]. In gastric mucosa, infection by H. pylori stimulated production of IL-17. IL-8 levels were increased and the tissue became infiltrated. Antibodies to IL-17 inhibited IL-8 secretion and antibodies to IL-8 blocked PMN leukocyte migration [1174]. Similar responses occurred in inflamed intestinal and bronchial epithelial cells [93, 1046]. Dysregulation of IL-17 appears to have a role in the pathology of allergic and autoimmune inflammatory diseases [18, 275, 276, 279, 1011, 1174]. In mice with collagen-induced arthritis, IL-1 and IL-17 levels were elevated; blocking antibodies for IL-17 alleviated joint destruction whereas IL-1 blockade had no effect, suggesting IL-17 was the more direct cause of arthritic damage [1169, 1414]. In patients with arthritis, synovial fluid IL-17 stimulated formation of osteoclasts, which caused tissue destruction [1011]. IL-17 also increased the production of gelatinase in human macrophages [879], aggrecanase and metalloproteinase in chondrocytes [230] and nitric oxide in osteoarthritic cartilage [88]. IL-17 has potential in cancer therapy. IL-17 stimulates bone marrow stromal cells to produce G-CSF, SCF and IL-8 for the production and mobilization of hematopoietic stem cells [1767]. This may be useful for stem cell transplantation. IL-17 promotes the maturation of

Cytokines dendritic cells [57]. This may have a role in cancer vaccination. It has also been shown that Chinese hamster ovary cells engineered to produce IL-17 were less invasive and metastatic [764]. There is also evidence that IL-17-transfected tumor cell vaccines can stimulate the generation of tumor specific cytotoxic T cells [133]. In a study on B16 melanoma in mice, tumor antigen specific CD4 Th cells that had been polarized in culture, were adoptively transferred into mice with growing tumors; interestingly, the Th17 cells had superior antitumor activity compared to Th1 cells, the type traditionally associated with anticancer activity [1395]. However, there are reports that by its proinflammatory properties, IL-17 may stimulate development of cancer. It has been shown that IL-17 increased the growth of cervical tumors transplanted in nude mice [1967]. In prostate, normal tissues produced little IL-17, but most benign prostate hyperplasia specimens and prostate cancers showed high IL-17 expression, mainly in T-cells but also in epithelial cells [1887]. In lung cancer cell lines, IL-17 had no direct effect on tumor cell growth but had a remarkable stimulatory effect on secretion of several angiogenic CXC chemokines. In SCID mice, lung cancer cells engineered to produce IL-17 grew larger and were more vascular than controls suggesting a role for IL-17-induced chemokines and angiogenesis in tumor growth [1467].

Interleukin-17B Proinflammatory Cytokine IL-17B has 27% amino acid identity with IL-17A. The gene is on chromosome 5q32–34 [1113]. IL-17B mRNA is produced by cells in the pancreas, small intestine, and stomach but not by activated T cells. IL-17B does not bind the IL-17 receptor. Rather it specifically binds the protein IL-17Rh1 (IL-17 receptor homolog 1). At least one additional IL-17 family member, IL-25, also binds IL-17Rh1 [1073, 1807]. The mRNA for this receptor has been detected in pancreas, kidney, thyroid, liver, brain and intestines. Receptor levels in intestine were increased during inflammation [1807]. In a monocyte cell line, IL-17B stimulated production of IL-1β and TNF-α while IL-17 had little effect. In activated fibroblasts, IL-17 stimulated production of IL-6 while IL-17B had no effect [1113]. These results showed that though the two cytokines are structurally related, they have distinct activities. In mice, IP injection of rIL-17B induced influx of neutrophils. This was probably not a direct effect but due to stimulated release of chemotactic factors [1807].

Walter M. Lewko and Robert K. Oldham

Interleukin-17C Proinflammatory Cytokine IL-17C has approximately 27% homology with IL-17. The distribution of IL-17C mRNA appears to be rather restricted. It was found in prostate and fetal kidney. Activated T cells did not produce it. The gene for IL-17C is on chromosome 16q24. The receptor used by IL-17C is not known; it does not appear to bind the IL-17 receptor [1113]. In a monocyte cell line, IL-17C stimulated production of IL-1β and TNF-α while IL-17 had no effect. In activated fibroblasts, IL-17 stimulated IL-6 secretion while IL-17C had no effect. These results showed that while IL-17 and IL-17C are related, they have distinct activities [1113]. Expression of IL-17C in mouse lung by adenovirus-IL-17C infection promoted neutrophilia and inflammatory gene expression such as IL-6 and IFNγ [825].

Interleukin-17D Proinflammatory, Inhibitor of Hematopoiesis IL-17D has 202 amino acids and as such it is the largest member of the IL-17 family. IL-17D is most homologous to IL-17B with 27% identity. The gene is on chromosome 13p11. IL-17D mRNA is expressed in a number of tissues including skeletal muscle, brain, adipose, heart, lung and pancreas. It was poorly expressed on activated CD4 T cells, CD8 T cells, monocytes and activated B cells [1880]. In cultured endothelial cells, Il-17D stimulated production of IL-6, IL-8 and GM-CSF. IL-17D had a suppressive effect of myeloid colony formation in agar gel assays [1880].

Interleukin-17E: see Interleukin-25 Interleukin-17F Proinflammatory, Asthma, Inhibitor of Angiogenesis Interleukin-17F is also referred to as ML-1 [930]. It has high homology with IL-17. The gene is on chromosome 6p. Activated CD4 T cells, monocytes, basophils and

191 mast cells produce IL-17F. It was not expressed by CD8 T cells or B cells [1881]. IL-17F is a homodimer; heterodimers with IL17A chain occur in mouse Th17 cells. Potency was intermediate of the two homodimeric forms in a chemokine release assay [1122]. The receptor for IL-17F is the protein IL-17RC. This receptor is related to IL-17R and IL-17A also binds it [1030]. IL-17F has a remarkable effect on vascular endothelial cells. It stimulated the production of endothelial IL-2, TGF-β and monocyte chemoattractant protein-1. In an in vitro assay for angiogenesis, IL-17F inhibited the formation of tubular, vessel-like structures [1881]. IL-17F may be acting directly or through the induction of cytokines such as TGF-β, which inhibit angiogenesis [1219, 1881]. IL-17F also stimulates the production of IL-6, IL-8 and GM-CSF in bronchial epithelium and it regulates cartilage matrix turnover [833, 929]. IL-17F is involved in asthma. In mice, expression of IL-17F in lung by adenovirus-IL-17F infection promoted neutrophilia and the expression of inflammatory genes such as IL-6 and IFNγ [825]. In humans, expression of IL-17F (but not IL-17) was increased in lung biopsies of asthma patients after allergen challenge. When added to cultured bronchial epithelial cells, IL-17F stimulated the production of IL-6 and IL-8 and cell surface ICAM-1; it recruits neutrophils into bronchial airways [930]. Polymorphism in the IL-17F gene appears to influence susceptibility to asthma. Japanese subjects with arg substituted at position 161 were protected from the disease; this variant blocked the induction of IL-8 by wild type IL-17F [931]. There are no reports on cancer for this relatively new cytokine, though IL-17F is of interest for its proinflammatory and antiangiogenic effects.

Interleukin-18 Interferon γ, NK and Th1 Response, Regulation of Inflammation IL-18 was discovered in mice with severe hepatitis induced by Propiobacterium acnes and the endotoxin LPS [1417]. IL-18 was originally called interferon-γ inducing factor (IGIF) for its remarkable stimulation IFNγ secretion. It is synthesized as a 192 amino acid proprotein, which is processed to the 156 amino acid active form [2045]. IL-18 is similar to IL-1β in that its nascent protein lacks the signal peptide usually found on secreted proteins [120, 1489] and proteolytic activation of the proprotein is carried out by caspase-1 (ICE) [688].

192 Activation is necessary for secretion; caspase-1-deficient macrophages do not secrete IL-18 as usual when treated with LPS [512, 618, 688, 1779]. IL-18 is produced by macrophages, dendritic cells [1489, 1600] and Kupffer cells [1779, 2045]; levels are increased by microbial infection or LPS treatment. IL-18 is also produced by adrenal cortex (in the area of cortisol production) [340], by skin keratinocytes [1895] and by airway epithelium [234]. In adrenal cortex, expression was increased by cold stress as a possible link between the environment and immune response [340]. Treating mice with contact allergens stimulated IL-18 expression in keratinocytes [1895]. In airway epithelial cells, IL-18 levels were related to Th1 status [234]. IL-18BP is a binding protein found in circulation, which has relatively high affinity for this cytokine. As a feedback loop, IL-18 induces IFNγ and interferon induces IL-18BP. It competes with the receptor for free IL-18 and in this way regulates IL-18 activity [963, 1465, 1640]. A relative lack of IL-18BP occurs in patients with hemophagocytic syndrome, a disease with elevated free IL-18 and characterized by a strong Th1 response [1260]. The IL-18R contains two subunits [180, 965, 2014]. The α subunit binds IL-18 and the β subunit performs signal transduction. Although the β subunit does not bind IL-18, as part of the receptor complex it enhances affinity for IL-18 [965]. Interestingly, the IL-18Rα subunit was originally discovered and named IL-1 receptor related protein (IL-1Rrp) for its molecular similarity to the IL-1 receptor, though this protein did not actually bind IL-1 [439, 1488, 1538]. At the time, it was referred to as an orphan receptor for lack of a known ligand; later it was determined to be the receptor for IL-18 [795, 1986, 2014]. The IL-18Rβ subunit is also a member of the IL-1R family. It is related to the IL-1R accessory protein. When IL-18 binds, it activates a pattern of cell signaling which is similar to that of IL-1 [392, 1000]. In knockout mice genetically defective for the IL-18 receptor, development of Th1 cells was impaired. NK cells had decreased cytotoxicity and IFN-γ production [796]. Overexpression of IL-18 in transgenic mice resulted in high levels of IgE, IgG1, IL-4, IL-5, IL-13 and IFN-γ, reflecting both Th1 and Th2 cell activation [796]. IL-18 and IL-12 have similar effects on several types of cells. These effects are often synergistic. In certain cases, IL-12 appeared to be required for IL-18 response. This seems to be due to the ability of IL-12 to increase IL-18 receptor levels. IL-12 upregulates both α and β subunits. Increased IL-18 receptor levels enhanced the capacity for response [521, 963, 1724, 2214, 2253]. IL-18 and IL-12 synergistically induce IFN-γ in T cells [998,

Cytokines 1300, 1652, 1894, 2253], B cells [2253], NK cells [1954, 2009], macrophages [1393, 1741] and in DCs [573]. IL-18 stimulates activated Th1 cells to grow and produce IFN-γ [1489]. It is well known that Th1 cell differentiation requires IL-12. Il-18 acts synergistically with IL-12 [1300]. IL-12 initiates differentiation; IL-18 intensifies the response. IL-2 is a costimulator of Th1 differentiation and growth [998]. IL-18 and IL-12 both increase IL-2 receptor levels. IL-18 stimulates Th1 cells but it did not appear to influence Th2 cell growth or production of IL-4 and IL-10 [998]. With Th2 differentiation, IL-18 receptor expression is lost and with it capacity to respond to IL-18 [2214]. Although IL-18 and IL-12 have related activities, there are differences. IL-12 initiates differentiation of Th1 cells; IL-18 does not initiate but enhances Th1 differentiation [1487, 1652]. IL-18 induced Th1 cells to produce IL-2; IL-12 did not [998]. In mouse activated PBLs, IL-18 stimulated GM-CSF production and depressed IL-10; IL-12 did not [2046]. IL-18 is generally considered a proTh1 cytokine, but IL-18 does stimulate Th2-related responses [995, 1033, 1199, 1684, 2162]. B cells contain receptors for IL-18 and IL-12. These two cytokines synergize in the production of immunoglobulin and IFN-γ [13]. IL-18 also stimulates IL-4 secretion in NKT cells [1085, 2251, 2254] and IL-13 secretion by NK cells [797]. Overexpression of IL-18 by B cells and T cells in transgenic mice induced high levels of both Th1 and Th2 cytokines [796]. IL-18 also acts synergistically with interferon-α/β in the secretion of IFN-γ by T cells. Virus infection induced macrophages to produce IFN-α/β and IL-18 (but not IL-12). Conditioned media from these macrophages induced IFN-γ in T-cells. Neutralizing antibody to IFNα/β blocked secretion of IFN-γ; antibody to IL-12 had no effect. These studies showed that the type I interferons acted synergistically with IL-18 in the production of immune interferon [1725]. IFN-α increased the levels of an adapter molecule (MyD88), which facilitated IL-18 receptor signaling [1724]. IL-18 has remarkable effects on NK cells. IL-12 and IL-2 are also well known stimulators of NK cells. IL-18 in combination with IL-12 or IL-2 induced much higher NK cell proliferation, IFN-γ secretion and antitumor activity than IL-12 or IL-2 induced when added alone or together [2009]. These results suggested an obligatory role for IL-18 in NK proliferation and function [2009]. Cell killing by Fas-mediated apoptosis is stimulated by IL-18. IL-18 upregulates Fas ligand (discussed below) in NK cells [2035] and in helper T-cells [381].

Walter M. Lewko and Robert K. Oldham In NK cells, IL-18 acts together with IL-2 and IL-12. The IL-18 treated NK cells were positive for perforin but killed target cells exclusively by FAS engagement [2035]. By its ability to stimulate interferon-γ secretion, IL-18 also stimulates Fas levels in many target cells. IL-18 has a role in the induction and regulation of inflammation. Neutrophils respond to IL-18 with increased production of cytokines, CD11b (complement receptor) and granule release. In a mouse model, IL-18 neutralizing antibodies suppressed footpad inflammation caused by carragean injection [1102]. PBLs treated with IL-18 produce pro-inflammatory TNF-α and in turn IL-1β and the chemokines IL-8 and MIP-1α [1601]. IL-18 also brings about regulation of inflammation. In T cells and NK cells, IL-18 together with IL-2 stimulated the production of IL-13, an inhibitor of inflammation [797]. IL-18 appears to be involved in rheumatoid arthritis [652, 1103]. Elevated levels of IL-18 are found in arthritic synovial fluid and serum [652]. In a collageninduced arthritis model, mice lacking IL-18 had a greatly reduced incidence and severity of arthritis compared with control mice. T cells from IL-18 deficient mice had a reduced capacity for antigen-induced cell division and secretion of proinflammatory cytokines [2131]. IL-18 has also been implicated in other inflammatory diseases including Crohn’s disease of the bowel [1577] and in sarcoidosis [662]. IL-18 appears to have a role as both a mediator and regulator of angiogenesis. In culture, IL-18 stimulated vascular endothelial cells to migrate and form capillary-like structures. In animals, implants containing small amounts of IL-18 stimulated the growth of new vessels [1535]. As a regulator, it has been shown that IL-18 suppressed angiogenesis and it did this by blocking bFGF-stimulated cell division in endothelial cells [240]. IL-18 has anticancer activity in many tumor models. Elevated IFNγ and NK cells are generally required, but depending on the system CD4+ or CD8+ T cells may be involved [1301, 1302, 1509]. Combinations of IL-2 plus IL-18 [1854, 2156] and IL-12 plus IL-18 [1117, 1509, 1624] generally have synergistic effects. These studies have been extended to an IL-2/IL-18 fusion protein [4], which produce NK and T cell responses with lower toxicity. Additionally, IL-18 is being tested, with some success, in cancer vaccines [840, 1228, 1852, 1969, 2210, 2224]. Further, it has been reported that NKT (generally considered to be a regulatory and immunosuppressive cell type) may have anticancer activity. NKT cells isolated and cultured with IL-12 plus IL-18 produced activated cells that inhibited tumors when transferred to mice [118].

193 It has been suggested that IL-18 may be involved in cytotoxic T cell development by acting as a bridge between the innate and adoptive immune systems [1962]. IL-18 stimulates IFN-γ levels and activates NK cells (Fas L) causing tumor cell apoptosis. This provides apoptotic bodies for dendritic cell antigen presentation and the induction of specific CTLs [1962]. IL-18 is being tested in cancer patients. In a phase I trial, IL-18 was administered to 28 patients, mainly renal cancer and melanoma. Increases in serum IFNγ, GM-CSF and other indications of cell activation were observed. There were two partial responses; further studies are warranted [1651]. It should be mentioned that while IL-18 has anticancer activity, certain cancers may be able to exploit the IL-18 system. For example, IL-18 binding protein is naturally secreted in response to IFNγ and it downregulates IL-18 activity. Many tumors secrete IL-18 BP. In this way the anticancer effect of IL-18 may be inhibited by the tumor [1545]. In certain cancers, it has been reported that IL-18 stimulates growth, angiogenesis, adhesion to endothelium and invasion [246, 962, 1535, 2075]. In these tumors IL-18 may contribute to progression. Further, IL-18 may have a role in immune escape. IL-18 upregulates Fas ligand in B16F10 melanoma cells. It is possible that tumor cell-Fas ligand may induce apoptotic death of effector cells resulting in immune suppression [311].

Interleukin-19 Inflammation IL-19 was discovered in LPS-stimulated monocytes [582]. It is a member of the IL-10 cytokine family (IL-10, IL-19, IL-20, IL-22, IL-24, IL-26, IL-28, IL-29). The gene for IL-19 is located together with IL-10 on chromosome 1q31–32. A homodimer appears to be the active form [582]. LPS and GM-CSF stimulate monocytes to produce IL-19. In LPS activated monocytes, IL-4 and IL-13 each enhanced [584] and IFNγ depressed IL-19 secretion [583]. Il-19 is also produced by keratinocytes of psoriasis lesions [1660]. IL-19 binds and signals through the IL-20 receptor (IL-20Rα/IL20Rβ). IL-19 does not bind the IL-10 receptor. IL-20R is expressed in skin, lungs, reproductive organs and various glands. Receptor levels are in inflamed tissues [462, 583, 1540]. Monocytes treated with IL-19 secrete IL-6, TNF-α, and reactive oxygen species [1125]. In T cells, IL-19 appears to favor Th2 differentiation and IL-4 secretion.

194 [583]. In PBMCs IL-19 induces IL-10 secretion and its own production. IL-19 production is in turn downregulated by IL-10 [902]. IL-19 appears to be involved in asthma [1124] and psoriasis [1114, 1660]. Asthmatic patients had twice the serum levels of IL-19 compared with controls; levels of IL-4 and IL-13 were also elevated. In culture, activated T cells treated with IL-19 secreted Th2 cytokines IL4, IL-5, IL-10 and IL-13 [1124].

Interleukin-20 Inflammation, Skin Development and Immunity IL-20 is a member of the IL-10 family. The gene for IL-20 is located on chromosome 1q31–32 together with the genes for IL-10, IL-19 and IL-24 [582]. IL-20 is produced by keratinocytes [1641], monocytes [2187] and glial cells [799]. IL-20 binds two receptors (IL-20Rα/IL20Rβ) and (IL-22Rα/IL20Rβ) [169, 1540]. IL-20R levels are elevated in psoriatic skin [169]. IL-20 signals by STAT3 activation [462, 463]. IL-20 appears to regulate keratinocyte involvement in skin inflammation [1641]. Overexpression of IL-20 in transgenic mice resulted in aberrant differentiation of epidermis, keratinocyte proliferation and abnormal skin resembling psoriasis. These mice also lack adipose tissue and their T lymphocytes show high apoptosis; they die soon after birth [169]. IL-20 stimulates the growth of CD34+ multipotential progenitors in a unique way, without imparting any tendency towards a particular developmental pathway, erythroid, granulocytemacrophage or megakaryocyte [1139]. In humans, IL-20 appears to be involved in psoriasis and skin inflammation [2128]. In lesions from patients, IL-20 and its receptor were elevated. IL-20-treated T cells produced increased levels of keratinocyte growth factor [2128]. Glial cells can produce IL-20 and LPS stimulates release. This suggests that IL-20 may have a role in inflammation of the brain [799]. In arthritis patients, synovial fluid contains elevated IL-20; synovial fibroblasts treated with IL-20 secreted IL-6 and IL-8. In rat model, IL-20 blockade decreased severity of arthritis. It appears that IL-20 is involved in joint inflammation [809]. There is evidence for IL-20 being pro-angiogenic and anti-angiogenic. Endothelial cells contain IL-20 receptors. When treated with IL-20 these cells proliferate, migrate and form tubular structures; bFGF, VEGF and

Cytokines IL-8 are released. However, in studies of lung cancer, IL-20 inhibited COX-2 and prostaglandin E2 production in epithelial and endothelial cells, and it inhibited PMA-induced angiogenesis [805, 746].

Interleukin-21 NK, T and B Cell Development, Immunomodulation IL-21 is a pleiotropic cytokine, which is structurally related to IL-2, IL-4, and IL-15 [78, 1520, 1540]. IL-21 is produced mainly by Th2, Th17 and follicular T cells [316]. The receptor for IL-21 has two subunits, IL-21Rα and IL-2Rγ. IL-21Rα is related to IL-2Rβ and IL-4Rα; IL-2Rγ is the subunit common to several IL-2 family receptors. The IL-21 receptor is expressed on T, B, and NK cells [78, 699, 1520]. T cells are stimulated and regulated by IL-21. Typical Th2 responses (e.g. to schistosomes, airway inflammation) depend on IL-21 [570, 1561]. IL-21 also supports the clonal expansion of virus and tumor antigen specific effector CD8+ T cells [2059, 1120, 1121]. IL-21 sustains the expression of CD28, an important costimulatory receptor [34, 1134]. It increases or decreases IFN-γ production depending on conditions [1903, 1932, 2208]. But IL-21 also regulates CD8+ T cell expansion when required by inducing apoptosis [113]. In mice, plasmid DNA vaccines expressing HIV-1 env glycoprotein showed increased T cell response when combined with IL-21 [177]. At least in part, increased generation of CD8+ cytotoxic T cells may be the due to a suppressive effect IL-21 has on Foxp3 regulatory T cells (Li 08) or the response of Th cells to Tregs [1550]. IL-21 is involved in NK cell expansion, function and regulation. In human bone marrow cultures, IL-21 stimulated NK cell proliferation and maturation [1539]. In cultured mouse cells, IL-21 increased NK function even as it depressed growth [919]. IL-21 appears to be able to modulate cytotoxicity towards certain target cells. In human NK, IL-21 depressed the NKG2D receptors while enhancing others [227]. When NK cells were treated with IL-21, human breast cancer cells coated with Trastuzumab were more effectively killed by ADCC [1655]. IL-21 influences development of B cells and Ig production. IL-21 induces differentiation of naive and memory B cells into antibody-secreting plasma cells [501, 1521]. Depending on the conditions, IL-21 may increase or decrease growth or induce apoptosis [1540, 1285]. IL-21 regulates Ig class switching. It is a switch

Walter M. Lewko and Robert K. Oldham factor for IgG1 and IgG3; IL-21 depresses IgE [1522, 1551, 1931, 2196]. IL-21 inhibits dendritic cell activation and maturation [192, 1902]. It is part of a negative feedback loop between dendritic cells and T cells in which activated dendritic cells stimulate T cells, inducing them to produce cytokines including IL-21 which in turn inhibits dendritic cells [1902]. IL-21 is involved in the Th system and regulation of inflammation. IL-21 is produced by Th17 cells and in an autocrine manner IL-21 sustains expression of the Th17 transcription factor RORγT and secretion of IL-17 [2129]. IL-21 has been studied in a number of different experimental tumors. It has been shown to have anticancer activity related to T cells [338, 427, 577, 1361, 1420], B cells [1835], NK cells [338, 577, 1420, 1849, 1951, 2101] and NKT cells [1849]. Several of these studies used IL-21 as an adjuvant in vaccines. Addition of IL-15 to IL-21 improved the response [177, 1420, 2275]. Regulatory T cells may limit vaccine immunogenicity. In one mouse study, use of IL-21 secreting tumor cells together with anti-CD25 antibodies to block regulatory T cells increased cure rate from 17% to 70% [338]. IL-21 has direct effects on the growth of some hematologic malignancies. In B cell chronic lymphocytic leukemia, IL-21 is able to induce apoptosis in CpG-treated [883] or CD40-stimulated cells [387]. On the other hand, IL-21 is a growth factor for certain adult T-cell leukemia [2042] and melanoma cells [198]. IL-21 is in clinical studies. Melanoma and renal cell carcinoma patients, treated with IL-21 in phase I, tolerated the cytokine reasonably well and showed evidence of anticancer activity [383, 1187]. IL-21 is also being used to develop more effective CD8+ T cells for adoptive immunotherapy [760]

195 There is a soluble IL-22 binding protein, which antagonizes IL-22 activity. The IL-22BP has homology with IL-22R, but it lacks the transmembrane cell-binding region. In effect, the IL-22BP is a decoy receptor [463, 1013]. IL-22 levels rise in LPS-treated animals. IL-22 appears to function during inflammation and immune response. IL-22 mainly targets non-circulating cells involved in innate immunity including epithelium, keratinocytes, and hepatocytes. In keratinocytes, IL-22 induces hyperplasia, migration, antimicrobial proteins and production of proinflammatory molecules [178, 2191]. In liver cells, IL-22 increases the production of acute phase proteins [466]; it also induces LPS binding protein, which neutralizes this proinflammatory and Th17-inducing microbial product [2189]. IL-22 also has a mild inhibitory effect on IL-4 production by Th2 cells [2212]. IL-22 levels are elevated and it appears to be involved in certain inflammatory diseases including rheumatoid arthritis [847], psoriasis [1186, 2191, 2291], inflammatory bowel disease and Crohn’s disease [49]. IL-22 does stimulate inflammatory molecules, and may cause pathology but it also appears to be involved in resolution of inflammation and tissue regeneration. In mice, IL-22 has been shown to ameliorate experimental autoimmune myocarditis [287] and ulcerative colitis [1922]. In pancreatic acinar cells, IL-22 induces pancreatitis-associated protein [11]. IL-22 has a protective effect during liver injury. IL-22 induced antiapoptotic factors in hepatocytes and stimulated growth suggesting a role for IL-22 in liver cell survival and tissue repair [1611]. With regard to cancer, there is a report that IL-22 inhibited the growth of EMT6 breast cancer in treated mice by cell cycle arrest [2125].

Interleukin-23 Interleukin-22 Inflammation IL-22 is a member of the IL-10 cytokine family. It was originally referred to as IL-10-related T cell-derived inducible factor (IL-TIF). Activated Th17, Th1 and Th2 cells produce IL-22 [464, 465, 1123, 1186, 2188, 2212]. IL-22 is also expressed by IL-9 stimulated mast cells [464] and by activated NK cells [2190] The IL-22 receptor consists of two chains, IL22Rα and IL-10Rβ. Each chain separated binds IL-22 but both chains, associated, are necessary for activity. Signaling is through STAT 1, 3 and 5 [1012, 2212].

T cell Stimulation, Inflammation, Regulator of Adaptive and Innate Immunity IL-23 is composed of two subunits. The p19 subunit is related to p35 of IL-12. And p40 is identical to p40 of IL-12. Activated dendritic cells, macrophages and keratinocytes produce IL-23 [1502, 1533, 1575]. The IL-23 receptor is composed of IL-23 Rα and IL-12Rβ1. IL-23 activates Jak-STAT signaling characteristic of the IL-12Rβ1 subunit [1573]. The IL-23 receptor is expressed on DC, macrophages and T cells [1533]. The effects of IL-23 are similar to but distinct form IL-12. In mouse cells, IL-23 induces proliferation of memory T cells (CD4+ CD45RB low). IL-12 does not [1502].

196 IL-23 does not stimulate IFN in mouse T cells. In human T cells, IL-23, like IL-12, increases IFN-γ production, though to a lesser degree than IL-12. IL-23 also stimulates growth in human memory CD45RO T cells [1502]. T cells express ICOS (inducible costimulator) protein, which is a CD28 family member. ICOS is important for enhancement of Th and CD8+ T cell responses. In human T cells, ICOS is increased by IL-23 and IL-12; it is inhibited by IL-4 [2122]. This may provide a powerful way for IL-23 and IL-12 to amplify T cell responses. IL-23 induces inflammation [1502]. IL-23 appears to be involved in encephalomyelitis, arthritis and inflammatory bowel disease [298, 363, 1399, 2242, 2279]. Transgenic mice overexpressing IL-23 p19, had severe multiorgan inflammation, impaired growth, infertility and early death. Blood contained increased levels of neutrophils, IL-1α, TNF and acute phase proteins [2132]. TGF-β and IL6 induce Th17 differentiation; IL-23 stimulates and maintains the Th17 cells [10, 1058]. The reason for heightened inflammation and pathology may be explained by the lack of regulatory IL-10 in IL-23differentiated T cells. When induced with TGF-β and IL6 only, T cells secrete IL-10 in addition to IL-17 and the other proinflammatory cytokines [1267]. Microbial products induce macrophages and DCs to secrete IL-23. IL-23 is required for neutrophil production. Mice that were p40-deficient lacked neutrophils; treatment with IL-23 (but not IL-12) restored neutrophil levels [1841]. In dendritic cells, IL-23 stimulated IL-12 production, as did IL-12 itself. Further, IL-23 treated DC’s promoted immunogenic antigen presentation of an otherwise tolerogenic peptide, which IL-12 did not do [128]. IL-23 has been shown to be an effective adjuvant in anticancer vaccines for colon carcinoma [1143, 1795, 2112], melanoma [1143, 1497, 1516], and glioma [2267]. Prior depletion of regulatory T cells enhanced antitumor response. IL-23 induced IFNγ; CD8+ T cells mediated antitumor immunity [1497]. There is also evidence for non-T cell mediated antitumor immune effects of IL-23 in human pancreatic and esophageal tumors in nude mice [1794, 2043]. Some human tumors have elevated IL-23 levels. There is evidence that the proinflammatory nature of IL-23, compared with IL-12, may actually be responsible for the tumor growth and progression in certain cancers [1057].

Interleukin-24 IL-24 was discovered in melanoma cells that had been treated to induce differention, using IFNβ plus mezerein (a protein kinase c activator) [889]. IL-24 was originally

Cytokines called mda-7 (melanoma differentiation antigen-7). Its counterpart in mice is called FISP [1738, 1790]. In human cancer, Mda-7 is a tumor suppressor; expression of the gene in melanoma cells inhibited proliferation and induced apoptosis [889]. Loss of mda-7 expression was associated with disease progression [488]. Later, when the cytokine nature of mda-7 became clear, it was designated IL-24 [261, 278, 810, 1731]. IL-24 is a member of the IL-10 family [261]. The gene is located in the IL-10 cluster on chromosome 1q31–32 [810]. Activated T cells and macrophages produce IL-24. It is also expressed by many tumors [1582, 2187]. Expression is stimulated by IL-1, IL-2 and several other cytokines but not by Th2-related cytokines [1582]. IL-24 signals through two receptors IL-20R1/IL-20R2 and IL-22R1/ IL-20R2 [2104]. IL-24 is a pro-inflammatory cytokine; it stimulates the production of IL-6 and TNF [261]. Overexpression of MDA-7 in tumor cells, by adenovirus-IL-24 gene transfer, suppresses a variety of cancer types including breast, cervical, colorectal, glioma, lung, mesothelioma, ovarian, pancreas, prostate and sarcoma [242, 277, 278, 810, 1071, 1201, 1712, 1731, 1914, 1915, 1916, 2289]. Susceptible tumors exhibit decreased growth and increased apoptotic death; IL-24 also inhibits angiogenesis [295, 1617, 1731]. Radiation resistance may be reversed by IL-24 treatment [1914, 1915, 2218]. Conversely, IL-24 resistance, as due to overexpression of antiapoptotic survival factors, may be reversed by irradiation [1914]. There is much interest in IL-24 for the treatment of cancer [540, 854, 1070]. IL-24 depresses growth, induces apoptosis, inhibits angiogenesis and increases radiosensitivity in a variety of tumors, with little toxicity towards normal cells. There is particular interest in the use of mda-7 for gene therapy [854]. Adenovirus-IL24 infected cells which produce IL-24 are inhibited; bystander tumor cells are also affected [1913]. Several experimental adenovirus constructs have been developed to optimize the process. INGN 241 has successfully completed phase I trials [366, 2010].

Interleukin-25 Proinflammatory; Regulation of Th17 IL-25 is a member of the IL-17 family. It is also referred to as IL-17E. Th2 cells, eosinophils, mast cells, macrophages and microglial cells produce IL-25 [844, 915, 985, 1807, 2109]. IL-25 binds IL-17Rh1, the same receptor used by IL-17B [1073, 1807]. There are high levels of this receptor in kidney and moderate levels in other organs. IL-25 stimulates production of type 2 cytokines that protect against intestinal helminths [508, 1518, 1519].

Walter M. Lewko and Robert K. Oldham Transgenic mice that overproduce IL-25 had increased expression of Th2 cytokines IL-4, IL-5, IL-10 and IL-13, G-CSF and the Th1 cytokines IFN-γ and TNF-α as well. The TG mice had eosinophilia, elevated IgE and IgG1, and immune cell infiltration in many organs. These mice also suffered epithelial hyperplasia, hypertrophy in several organs and jaundice [1526]. IL25 appears to be involved in several inflammatory diseases. In mice, overexpression of IL-25 in lung by adenovirus-IL-25 infection induced airway hyperreactivity with Th2-like responses including IL-4, IL-5, IL-13 and eotaxin production, eosinophil infiltration, mucus production [825]. In eosinophils, IL-25 enhanced survival, increased expression of surface adhesion molecules [301] and stimulated production of proinflammatory IL-6, IL-8, MIP-1α, and MCP-1 [2195]. Lung tissue from asthmatic patients and atopic skin lesions show elevated expression of IL-25 and its receptor [2109]. IL-25 induces catabolic activity in articular cartilage and may be involved in arthritis [230]. It appears that during inflammation, Th2 cells and eosinophils/basophils may collaboratively reinforce one another to cause the disease state [2109]. While IL-25 seems to cause inflammation, IL-25 also appears to regulate it. For example, IL-25 controls Th17 inflammation. IL-25 −/− mice are much more sensitive than normal mice to the debilitating effects of experimental autoimmune encephalitis. In the CNS, microglial cells produce IL-25, which in turn induces IL-13 in Th2 cells. IL-13 downregulates DC activity and lowers the cytokines IL-1β and IL-6, which drive Th17 differentiation. In this way, IL-25 secretion in brain may be responsible for alleviation of damage associated with IL-17 in experimental encephalitis [985].

Interleukin-26 Epithelial Immune Response IL-26 is a member of the IL-10 family. It is also referred to as AK155 [532, 988]. IL-26 was discovered as an overexpressed protein in cultured T cells transformed by herpesvirus saimiri [792, 988]. The gene for IL-26 is located on chromosome 12q15. T cells, in particular activated memory T cells, and NK cells produce IL-26 [2187]. Secreted IL-26 binds heparin where it is stored in an inactive form until it is released [792]. The receptor for IL-26 is IL20R1/IL-10R2 [792, 1802]. Epithelium is a major target for IL-26. Treatment with IL-26 enhances expression of ICAM-1 and secretion of IL-8 and IL-10. By targeting colon epithelial

197 cells and skin keratinocytes, IL-26 may have a role in mucosal and cutaneous immunology [792].

Interleukin-27 Adaptive and Innate Immune Response; Regulation of Inflammation/Th17 IL-27 is a member of the IL-12 family. This cytokine has two subunits, p28 and EBI3 (Epstein-Barr virus induced gene 3). Activated dendritic cells and monocytes produce IL-27. Microbial and host factors stimulate production. The IL-27 receptor is WSX-1. The major targets of IL-27 are CD4+ T cells and NK cells [1713]. In naive T cells, IL-27 supports proliferation and increases IL-12R levels. IL-27 stimulates IFNγ production in NK cells and in activated T cells; in naïve T cells, IL-27 induces T-bet, IL-12R and Th1 differentiation [747, 2258]. Il-27 regulates inflammation. In mice where the IL-27/IL-27R system was defective, infection resulted in severe chronic inflammation. IL-17 inflammatory effects were exaggerated [115, 1663, 1911, 2176]. IL-27 regulates inflammation at several levels. It stimulates regulatory cells to secrete IL-10 [115]. IL-27 also appears to act directly on Th cells to suppress Th17 cell development [1911, 2258]. IL-27 also acts directly on activated granulocytes and macrophages to suppress production of reactive oxygen [2176]. IL-27 has anticancer activity. Expression of IL-27 in colon cancer cells has been shown to be immunogenic [309, 772]. Tumors secreting IL-27 were rejected. Mice developed tumor specific protective immunity. Interferon γ, CD8+ T cells and NK cells appeared to be involved [309, 772]. Poorly immunogenic B16F1 melanoma cells, engineered to secrete IL-27, were also inhibited. This growth inhibition was due to NK cells; added IL-12 was synergistic [1497]. IL-27 has also been found to be antiangiogenic [1811].

Interleukin-28A, Interleukin-28B, Interleukin-29 Type III Interferons; Antiviral, Antitumor IL-28A (IFN-λ2), IL-28B (IFN-λ3) and IL-29 (IFN-λ1) are three recently discovered cytokines in a new class of interferons, referred to as the lambda or Type III interferons. They are produced by activated (e.g. viral RNAtreated) dendritic cells, monocytes and macrophages. IFNα and TNFα enhance the λ interferon response to

198 viruses by increasing expression of toll-like receptors and signaling molecules. The λ interferons are related to the type I interferons and to IL-10. The receptor used by these cytokines is IL-28RαIL-10Rβ. The λ interferons activate typical IFNinducible genes including MHC I and II, oligoadenylate synthetase and MxA. λ interferons inhibit replication of certain viruses in vitro and stimulate antiviral immune response in treated mice [54, 1241, 1288, 1514]. IFN-λs are involved in the exquisite cell interactions involved in immune regulation. Monocytes, macrophages and dendritic cells produce IFN-λs and these cells are influenced by them, IFN-λ secretion increases with LPS-induced dendritic cell differentiation and maturation. Keratinocytes may be activated; Th1/Th2 ratios and cytotoxic T cell activities may be enhanced [2190]. And it has also been shown that IFN-λ-treated dendritic cells induce proliferation of Treg cells, which eventually suppress effector T cell activity [1292]. IFN-λs also have anticancer activity. In cultured neuroendocrine carcinoma cells, IL-28A and IL-29 inhibited cell proliferation and induced apoptosis (2300). IFN-λ secreting tumor cells implanted in animals stimulated NK and CD8 T cells immune response, resulting in decreased growth and metastasis in melanoma, fibrosarcoma and colon tumor models [1065, 1466, 1728].

Interleukin-31 Pruritis, Allergic Inflammation IL-31 is a cytokine that is produced by T cells, in particular, Th2 cells. IL-31 receptor is composed of two chains, IL-31 Rα and oncostatin M Rβ. The IL-31R is found in activated monocytes, epithelial cells and in sensory neuron bodies associated with skin. IL-31 appears to be responsible for itch sensation. Transgenic mice overexpressing IL-31 develop itching skin lesions analogous to human atopic dermatitis. IL-31 is elevated in mouse and human dermatitis lesions, but not in human psoriatic skin lesions. Pruritis in a mouse model appeared to be related to IL-31 secretion [431, 1438, 1859, 1952]. IL-31 is involved in asthma. In lung epithelium, IL-31 induced EGF, VEGF and inflammatory chemokines [855] and inhibited cell proliferation [291]. IL-31 also has regulatory functions. Mice that are IL31R−/−have exaggerated Th2 responses; when injected with schistosome eggs, these mice developed severe lung inflammation, granulomas and fibrosis. Levels of

Cytokines IL-4, IL-5 and IL-13 were elevated. IL-31 signaling appears to limit the type 2 inflammatory process [1558].

Interleukin-32 Inflammation IL-32 was discovered as the transcript NK4 in activated immune cells. Many types of cells produce IL-33 when exposed to inflammatory conditions. IL-33 has no homology with other known cytokines. IL-32 has six isoforms. Activated NK cells, T cells, and IFNγ-treated epithelium and monocytes produce IL-32 [438, 900, 964]. IL-32 induces inflammation by way of p38 MAP kinase and NF-κB signaling [1444]. IL-32 induces monocytes to produce TNFα, IL-8, PGE2 and other inflammatory factors. It signals through NFκB and MAP kinase [692]. IL-32 synergizes with the microbe sensing NOD receptor system for the induction of IL-1 and IL-6 by muramyl dipeptide. But IL-32 had no such stimulating effect on the TLR system [1443]. In addition to inflammation, IL-32 also influences specific immunity. IL-32 induced differentiation to macrophages from blood monocytes and, interestingly, from dendritic cells [1444]. Apoptotic T cells were high in IL-32. Forced expression of IL-32 induced apoptosis. This suggested that IL-32 is involved in AICD. This effect of IL-32 on T cells may be by a non-secreted, intracrine mechanism [630] There is evidence IL-32 is involved in several diseases including rheumatoid arthritis, psoriasis, Crohn’s disease and chronic obstructive pulmonary disease [438]. In tissue biopsies from patients with rheumatoid arthritis compared with osteoarthritis, IL-32 was increased and levels correlated with disease severity [900]. Of 171 genes tested, four genes were overexpressed in RA fibroblasts, and the gene for IL-32 was most pronounced [229].

Interleukin-33 Inflammation, Allergy IL-33 is an IL-1 family member. It is produced by vascular endothelium and certain fibroblasts. IL-31 is synthesized as a precursor and cleaved by caspase-1, in a manner similar to IL-1 processing. The IL-33 receptor is the IL-1 receptor-related protein ST2. It signals through NF-κB and MAP kinases.

Walter M. Lewko and Robert K. Oldham IL-33 enhances expression of Th2 cytokines IL-4, IL-5 and IL-13. In mast cells, IL-33 stimulates maturation, survival and the production of IL-8 and Th2 cytokines. In treated mice, IL-33 induces severe mucosal inflammation [28, 434, 839, 1750]. IL-33 and Th2 cytokines were required for expulsion of intestinal nematodes [821]. In mice, Il-33 has been shown to protect against the development of atherosclerosis [1310]. In endothelial cells, IL-33 appears to also have an intracellular role, apart from its receptor. It translocates into the nucleus where it binds chromatin and as a nuclear protein it represses transcription [247].

Interleukin-35 Treg Cytokine, Regulation of Th17 IL-35 is a heterodimeric cytokine that is composed of IL-12α and IL-27β chains. nTreg cells (CD4+ CD25+ Foxp3+) produce IL-35. The secretion of this cytokine is upregulated when Treg cells are activated by contact with effector T cells. IL-35 appears to have a major role in regulation for IL-27β−/− Treg cells show loss of function. For example, they do not control homeostatic proliferation as wild type cells do; they do not cure inflammatory bowel disease. Recombinant IL-35 has been shown to induce Treg cell proliferation and production of IL-10. It suppressed the expansion of CD4+ CD25−effector T cells and it inhibited differentiation and IL-17 production by Th17 cells. And in treated mice, rIL-35 decreased the severity of collagen-induced arthritis [335, 1451].

4-1BB Iigand Costimulation of T Cells, T Cell Memory 4-1BB ligand (4-1BBL) is a 30 kDa transmembrane glycoprotein. T cells, stromal cells of thymus and spleen, and antigen presenting cells including monocytes, B cells and dendritic cells express this ligand [23, 389, 639, 1059, 1584]. The receptor is 4-1BB (CD137). It is a 30–35 kDa transmembrane protein, which is related to the TNFR [1585, 1761, 1763]. The human gene is located on chromosome 1p36 in a cluster of related genes [1763]. There is a soluble form of this receptor, the product of alternative mRNA splicing [1787]. 4-1BB was originally discovered as an activation-induced antigen on T cells [23, 639, 1044, 1045, 1765]. 4-1BB is also produced by B cells, dendritic cells, monocytes and

199 NK cells [1761, 2160]. It is also found on epithelial, endothelial, and neural cells [184, 1622]. In T cells, the engagement of 4-1BB induces proliferation, cytokine secretion, cell survival and the suppression of AICD. 4-1BB stimulates memory response to second antigen challenges [147, 238, 317, 389, 639, 827, 1585, 1764, 1948]. 4-1BB is one of several costimulatory signaling systems, which may supplement, modify and, to a degree, replace costimulation through the B7/CD28 system [213, 389, 390, 391, 715, 828, 833]. 4-1BB is stimulatory but it is also regulatory; it preferentially induces proliferation of CD8 T cells over CD4 T cells [1818]. 4-1BB signaling tends to suppress Th2 responses and humoral immunity [789, 1319]. In this way, 4-1BB signaling can ameliorate Th2-related allergy and autoimmunity [312, 1927]. In NK and NKT cells, stimulation of 4-1BB induces activation and the secretion of cytokines. Mice lacking 4-1BB have depressed NK numbers and activity [1289, 2078]. NK cells are well known as cytotoxic effector cells but they also appear to help CTL differentiation. When stimulated with antibodies to 4-1BB, NK cells produce IL-2 and IFNγ, which increase the growth and cytotoxicity of antigen-specific T cells [1289, 2160]. 4-1BB ligation likewise stimulates dendritic cells to secrete IL-6 and IL-12, which enhance antigen-specific T cell response [2159]. In this way 4-1BB costimulates T cells directly and indirectly by its cytokine stimulating effects in several types of cells. On binding its receptor, 4-1BB ligand is capable of reverse signaling. In T cells, reverse signaling suppresses immune response and induces apoptosis [1764]. In monocytes, reverse signaling induces IL-6, IL-8, TNF-α and ICAM-1 but inhibits the production of IL-10 [1059]. Several studies show that 4-1BB stimulation serves as an adjuvant in vaccines against cancer [693, 862, 1029, 1116, 1233, 1290, 1312, 1333, 1718, 2138, 2211, 2215, 2280] and viruses [146, 390, 1958]. For example, in mice with melanoma, survival was shorter in mice that lacked 4-1BB compared to normal 4-1BB+ mice. Treatment of normal mice with agonistic antibodies to 4-1BB further increased survival [906]. Agonistic antibodies to 4-1BB enhanced the efficacy of a tumor lysatedendritic cell based vaccination [1866]. 4-1BB ligand has been detected in several carcinoma cells. These tumors cells costimulate T cells and IFNγ production. Reverse signaling stimulated tumor cell IL-8 production and depressed growth [1717]. Several mouse studies showed the benefit of injected mabs to 4-1BB suggesting it may be another receptor for which antibodies may be useful in the treatment of human cancer.

200

CD27 ligand Costimulation of T and B Cells; B Cell Differention; Apoptosis CD27 ligand (CD27L, CD70) is a cell surface glycoprotein. It is a member of the TNF family [638]. Activated B cells [1093], T cells [8, 1505], NK cells [2226], dendritic cells [224] and certain B cell malignancies [1619, 928] produce CD-27L. It is expressed preferentially on CD45RO memory CD4 T cells [8]. In dendritic cells, CD27L is induced by CD40L or by TLR stimulation [224]. Upon binding its receptor, CD27L may back-signal to increase cytotoxicity in γδ T cells [1505], antibody production in B cells [1094] and growth of certain B cell malignancies [928]. CD27 is the receptor for CD27L [187, 638, 763]. CD27 is a 50 kDa transmembrane glycoprotein. It is a member of the TNFR family [233, 762, 2060]. CD27 is expressed on naive and memory T cells [8, 155, 1924, 2060], germinal center and circulating memory B cells [984, 1253, 2015], B cell leukemias [2061] and on NK cells [1923]. CD27 is considered a memory marker for T cells [2015] and B cells [985]. Activation of T cells markedly increases CD27 and induces the release of a soluble form of the receptor, which can be found in blood and urine. The soluble form appears to be a proteolytic product [761, 762, 1146]. Elevated levels are characteristic of infection, autoimmunity and B cell malignancies. Soluble recombinant CD27 is an antagonist [87]. The CD27–CD27L system is costimulatory for the induction of T cells. Stimulating antibodies to CD27 induce T cell activation, proliferation and cytotoxicity [66, 638, 992, 1924, 2060]. Naive (CD45+) T cells and CD45RO memory cells respond to CD27 ligation [8, 992]. In NK cells, CD27 expression is upregulated by IL-2. CD27 ligation stimulates NK activation and cytotoxicity [1923]. For memory B cells, CD27 appears to be part of the switch between memory and activated plasma cells. engagement inhibits differentiation of B cells into Ig-secreting plasma cells [1616]. It favors the development of memory B cells with high antigen affinity [1615]. CD27 engagement induces apoptosis in activated T and B cells. The cytoplasmic segment of CD27 is rather short. Unlike TNF and Fas, CD27 does not have a death domain. However, this receptor does associate with a cytoplasmic protein, Siva, which has a death domain segment and Siva mediates CD27-induced apoptosis [1591]. In the treatment of cancer, there is interest in the CD27 system for its ability to stimulate T, B, and NK

Cytokines cells. When vaccine tumor cells are transfected with CD27L, there is enhanced immune response [348, 1153, 1453]. CD27 ligation supports the clonal outgrowth of tumor-specific T cells [638, 762]. Further, the CD27 system appears to be important in the production of T cells for adoptive cell immunotherapy [811, 1589]. IL-2 induces growth of tumor-specific T cells and part of its stimulatory effect is due to upregulation of T cell CD27L. Blocking antibodies to CD27L depressed IL-2-induced growth. It appears that CD27 signaling mediates IL-2-induced T cell proliferation [811, 1589]. It should be noted, CD27L [928, 1093] and CD27 [2061] are found on B cell malignancies and these molecules can have a role in tumor progression. Also, CD27L has been observed on certain non-hematological tumors including renal cell carcinoma [429] and brain tumors [732, 2177]. Tumor cell-CD27L causes apoptosis in T and B cells and might have a role in immune escape [429, 2177].

CD30 ligand T Cell Costimulation, Selection; Apoptosis; Regulation of Ig Class Switching CD30 ligand (CD153) is a 40 kDa transmembrane glycoprotein in the TNF family. It is found on macrophages [1840], B cells [598, 2259, 2260], CD4 and CD8 T cells [2259], megakaryocytes, neutrophils, erythrocyte precursors [598], eosinophils [1570], mast cells [541] and many though not all leukemias [599]. On binding its receptor, CD30L has the capacity to signal back into its parental cell [2165]. Reverse signaling in neutrophils stimulates an oxidative burst and IL-8 production. In T cells, reverse signaling stimulates proliferation and IL-6 production [2165]. CD30 is the receptor for CD30L. It is a 105–120 kDa transmembrane protein and a member of the TNFR family [473, 605, 1840]. The intracellular segment contains two binding sites for TNFR-associated factors (TRAFs 1, 2, 3) which function in signaling [601]. The CD30 antigen was originally discovered as Ki-1, a marker for Reed Sternberg cells in Hodgkin’s lymphoma [1759]. CD30 is found on activated T, B, and NK cells [35, 186, 489, 2088]. CD30 expression is transient; in T cells it depends on activation and CD28 signaling [621]. CD30 is a marker for activated, cytokine secreting helper T cells (Th0, Th1 and Th2) [704]. In particular, CD30 expression is associated with Th2 response [1255]; CD30 is stimulated by IL-4 and inhibited by IFN-γ [621]. CD30 is expressed on subsets of activated

Walter M. Lewko and Robert K. Oldham CD45RO+ memory T cells [35]. CD30+ cells produced IFN-γ and IL-5 while CD30− cells produced more IL-2. CD30+ T cells showed enhanced ability to provide help for B cells producing Ig [35]. Soluble CD30 is shed from cells and found in blood. CD30 shedding is increased by activation of CD30 and by treating cells with PMA. The protease responsible is TACE, the enzyme that processes and releases TNF-α [711]. Elevated levels of sCD30 are found in the blood of patients with immune disorders such as lupus erythematosis and rheumatoid arthritis and in patients with colon cancer and Hodgkin’s disease. In Hodgkin’s lymphoma patients, sCD30 correlates with poor prognosis [2256]. Changes in levels may be used to monitor a disease [711, 868, 904]. The specific biological effects of the CD30L–CD30 system are difficult to discern. Expression of the receptor is transient and certain effects appear to be opposed. CD30 engagement is costimulatory for the growth and differentiation of specific T cells [621, 683, 1840]. But the CD30L–CD30 system also inhibits function and induces apoptosis [1407, 1840]. CD30-deficient mice, have impaired negative selection of thymocytes suggesting a fault in apoptosis [36]. CD30 transgenic mice overexpressing CD30 in the thymus showed enhanced thymic negative selection [303]. Moreover, CD30 signaling induced TCR-dependent apoptosis in a T cell hybridoma cell line [186]. Lack of CD30 expression is also associated with the development of autoimmune T cells in experimental diabetes [280, 729, 1041]. On the other hand, in NOD mice that are genetically prone to diabetes, neutralizing antibodies to CD30L interfered with the development of the disease [280]. In a cytotoxic large granular lymphocyte cell line, CD30 activation depressed effector functions including FasL, perforin and granzyme production while inducing the effector cell’s own apoptotic program [1407]. CD30 thus appears be able to coordinate gene expression in NK and T cells to control effector selection, growth and differentiation and then downregulate cytotoxic functions, inhibit growth and induce effector cell death. T cells influence B cell antibody production and class switching by way of the CD30L–CD30 and CD40L–CD40 systems. CD40 ligation stimulates Ig class switching. CD30L reverse signaling inhibits class switching at the level of CD40 signaling [273, 274]. CD30 is also required for the development of B cell memory responses [593]. Mast cells expressing CD30L appear to have a role in Hodgkin’s disease. Mast cells were the predominant CD30L-positive cell type in tumors and these cells were capable of stimulating growth of Hodgkin and Reed

201 Sternberg cells [1336]. CD30L also appears to have a role in cutaneous inflammation. In atopic dermatitis and psoriatic skin lesions, mast cells were the predominant CD30L-positive cell type. On binding CD30, back signaling in these mast cells induced the secretion of IL-8 and other inflammatory chemokines. This mast cell activation occurred in an IgE-independent manner [539]. Eosinophils express CD30L and they stimulate the growth of co-cultured CD30-Hodgkin’s lymphoma cells [1570]. Eosinophils also express CD30; treatment with agonistic Mabs to CD30 induced eosinophil apoptosis [142]. A relatively small subset of normal lymphocytes express CD30 but it is overexpressed in several diseases making it an attractive target for therapy. In T cells CD30 is increased in autoimmune disease and in allergy [614]. The CD30 antigen is also found on virally transformed and HIV-infected lymphocytes [729]. It is highly expressed in Hodgkin’s disease, anaplastic large cell lymphoma and certain other malignant lymphoid disorders [1759]. In many lymphoid cell lines, CD30 ligation induces apoptosis but there are cases in which CD30 has no effect or stimulates growth [683, 1081, 1185]. Where CD30 ligation induces apoptosis in Hodgkin’s lymphoma cells, the presence of soluble CD30 was found to interfere. This may explain why sCD30 correlates with poor prognosis in these patients [2259]. Antibodies are being developed which bind specifically to cellular CD30 epitopes that are lacking on the shed receptor [1411]. In patients with Hodgkin’s disease, bispecific (Anti-CD16/CD30) antibodies have been tested with some success in a phase I/II trial. This construct was designed to activate NK cells and target the tumor cells [721]. SGN-30 is a humanized monoclonal antibody that inhibits Hodgkin’s disease tumors in nude mice [2088]; it is currently undergoing clinical trials.

CD40 ligand Costimulatory, Proinflammatory; B, and T Cell Stimulation CD40 ligand (CD154) is a 35 kDa membrane protein. It is expressed by CD4 T cells [1691] and by CD8 cells [1707]. The levels of this powerful cytokine are rather well controlled. It is produced during CD4 cell activation and down regulated upon binding its receptor [109, 260, 2058, 2240, 2241]. A soluble form of CD40L is released from CD4 T cells upon activation [653]. Soluble CD40L is biologically active and will substitute for cell-bound CD40L [955, 1055].

202 CD40 is the receptor for CD40L. It is a 50 kDa membrane protein, constitutively expressed, mainly on B cells [266], and to a lesser extent on dendritic cells, macrophages [21], T cells [511], fibroblasts [2241], thymic epithelial cells [585] and endothelial cells [786]. CD40 is also present on some tumor cells. The CD40/ CD40L system stimulates immune response, inflammation and apoptosis depending on the cell type and the conditions. In B cells, CD40 signaling causes activation, maturation and survival [400, 946, 1294]. The triggering of B cells through CD40 is critical for the induction of Ig production [72]. In the absence of CD40, B cells were tolerogenic [221, 952]. Binding Th2 cell CD40L induces reverse signaling and the secretion of IL-4 that in turn stimulates B cells [167]. The CD40 system provides help during CTL development. CD40L on CD4 T cell interacts with CD40 on AP cells (DC, B cell, virus-cell or tumor cell) to induce antigen processing, presentation and cytokine secretion [136, 756, 1645]. CD40 engagement also increases DC survival, costimulatory molecules B7.1 and B7.2, ICAM-1, and cytokines such as IL-12, which stimulate T cells and NK cells [136, 159, 263, 267, 1645, 1753]. The CD40L–CD40 system is necessary for a good immune response. CD40L-deficient mice were defective in antiviral immunity and memory CTL response [181]. Mice defective in the CD40 system were very susceptible to infection with Leishmania [236, 912, 1861]. Treating mice with stimulatory anti-CD40 Mabs produced a good T cell immune response to an otherwise weak Listeria monocytogenes immunogen [1658]. CD40 activation also appears to be required for allograft rejection; blockade of the CD40 system generally prevents rejection and induces tolerance [470, 651, 863, 1064]. CD40L is a proinflammatory cytokine. Engagement of CD40 induces the production of inflammatory cytokines in fibroblasts and macrophages [21, 2241], and the upregulation of surface adhesion molecules such as ICAM and VCAM on fibroblasts and endothelial cells [786, 1062, 2241]. Treating animals with soluble CD40L intranasally induced lung inflammation with infiltrating neutrophils and macrophages. IFN-γ intensifies CD40Linduced inflammation [2163]. Platelets contain both CD40 and its ligand and may be involved in CD40related inflammation and immune responses [377, 953]. CD40 on lung fibroblasts appears to have a role in pulmonary fibrosis [2241]. CD40–CD40L interaction is also required for a number of experimental autoimmune diseases. In animal models for myasthenia gravis [848], multiple sclerosis [615, 667], arthritis [471] and diabetes [105],

Cytokines CD40 activation exacerbated the disease while blocking CD40 depressed it. Development of autoimmunity is complex and sometimes paradoxical. The absence of CD40–CD40L interactions might induce autoimmune disease [1034]. Patients with rare X-linked mutations in the CD40L gene develop hyper-IgM syndrome, show defects in thymus-dependent immune responses, antibody production and germinal center formation. These patients suffer recurrent infection, increased cancer and autoimmune disease [441, 727]. The CD40 system regulates apoptosis, positively or negatively, depending on the target cells. In dendritic cells, for example, CD40 ligation on immature DCs induced survival and maturation, whereas CD40 ligation on LPS-matured DCs induced apoptosis [405]. Where CD40 induces apoptosis, it up-regulates Fas. Where CD40 inhibits apoptosis, it increases levels of the survival protein bcl-X [858, 2113]. The CD40–CD40L system has some remarkable antitumor effects. In normal B cells, CD40 ligation stimulated growth. In neoplastic B cells CD40 ligation tended to inhibit growth and induce apoptosis [575]. Certain solid tumors express CD40. When this is the case, CD40L might act directly on the tumor cells to induce death by apoptosis [756, 765, 2086]. CD40 ligation stimulates chemokine release. In human cervical carcinoma cells, CD40L induced macrophage chemoattractant protein-1 (MCP-1) and IFN-γ-inducible protein 10 (IP-10). The addition of IFN-γ had a synergistic effect [32]. These chemokines are involved in the recruitment of effector T cells. IP-10 is also angiostatic [1788]. As mentioned, CD40 ligation activates antigenpresenting cells and secretion of IL-12 by DCs. Good cytotoxic T cell responses were observed in animals treated with stimulating anti-CD40 mabs, or immunized with tumor cells engineered to produce CD40L [430, 433, 446, 567, 695, 740, 1415, 1863]. CD40 ligation enhanced the outgrowth and longevity of T cells [1256]. CD40–CD40L interactions were required for protective anticancer immunity by vaccination [1196, 695]. When CD40 signaling was blocked, no systemic antitumor immunity developed [1195]. CD40 signaling stimulates NK activity and related antitumor effects [245, 1415, 2038]. P815 mastocytoma cells engineered to produce CD40L were promptly rejected when injected into mice. NK cells mediated the anticancer effect. Production of IL-12 was required but effector CTL cells were not [1415]. In another study, mice were treated with stimulatory anti-CD40 mabs to activate signaling [2038]. Three different types of tumors were tested; growth and metastasis were inhibited. NK cells were required. The effect of CD40 was not

Walter M. Lewko and Robert K. Oldham direct but probably through APCs that produced NK cell stimulating IL-12 [2038]. A phase I trial of rhuCD40L in patients with solid tumors and NHL, encouraging preliminary results were seen including one long-term complete response [2087]. In a phase I vaccine trial, patients with CLL were treated with CD40L-producing autologous tumor cells. Leukemia cell counts decreased and lymph node size was reduced again suggesting that CD40L may be therapeutically useful [2154].

Chemokines Cell Activation, Migration, and Recruitment; Inflammation; Angiogenesis Chemokines include a rather large number of proteins, which have a variety of activities but function primarily as chemoattractants and activators of leukocytes [1656]. They induce cell migration, recruitment and infiltration into sites of inflammation, homing to sites of immune cell differentiation and passage across cellular barriers. They are involved in T cell activation and the polarization of Th1/Th2 cells [687, 1656]. Chemokines may also act on non-hematopoietic cells. They facilitate cell movement during inflammation, wound repair and morphogenesis. Chemokines are also involved in pathology, tumor growth and metastasis. HIV viruses use certain chemokine receptors (CXCR4) for entry into cells [524]. Chemokines are relatively small 7–14 kDa proteins. Most chemokines contain four conserved cysteines in the amino terminal region. Chemokines are classified based on the sequence in the region of these cysteines. 1. CXC chemokines (α chemokines): the first two conserved cysteines are separated by a single nonconserved amino acid. CXC chemokines may be classified further based on the presence or absence of Glu-Leu-Arg (ELR) just preceding the first conserved cysteine. There are at least five receptors for CXC chemokines. These receptors are members of the rhodopsin-like, seven transmembrane domain receptor family [1147]. As examples of chemokine– receptor interactions, CXCR1 and CXCR2 bind IL-8 and GCP-2 (granulocyte chemotactic protein-2) [5]. CXCR3 binds IP-10 (interferon-induced protein-10) and Mig (monokine induced by γ interferon) [894]. SDF-1 (Stromal derived factor-1), a pre-B-cell growth factor as well as a chemokine,

203 appears to be the only ligand for CXCR4 [1409]. ELR CXC chemokines tend to activate migration in neutrophils, the non-ELR CXC chemokines tend to activate lymphocytes. 2. CC chemokines (β chemokines): the first two conserved cysteines are together. There are nine known receptors for these chemokines termed CCR1, CCR2, etc. Well studied CC chemokines include MIP-1α (macrophage inflammatory protein-1α), MIP-1β, MCP (Monocyte chemoattractant proteins) 1, 2, 3, RANTES and eotaxin. CC chemokines are chemotactic for most types of leukocytes (T, B, DC, NK, eosinophils, basophils, DC), but not for neutrophils. [1656]. 3. C chemokines: two of the four conserved cysteines are missing, the first and the third. Lymphotactin is a C chemokine. NK cells produce it. Lymphotactin is specifically attractive for lymphocytes [949]. 4. CX3C chemokines: the first two conserved cysteines have three intervening non-conserved amino acids. There is a specific receptor Cx3CR-1 for these cytokines [849]. Fractalkine (neurotactin) is a Cx3C chemokine. It has two active forms; one is a membrane bound protein. The other is a soluble protein released from the membrane by the protease TACE [2030]. Fractalkine is expressed in neurons, microglial cells, fibroblasts and endothelial cells. It is upregulated during inflammation. Fractalkine is a chemoattractant for T cells, NK cells and monocytes and it induces adhesion [119, 1530]. In the brain fractalkine appears to be antiapoptotic, a survival factor for microglial cells [171]. ELR+ CXC chemokines are angiogenic; they stimulate endothelial cell migration and tube formation; these include IL-8, GRO (growth-related oncogene)-α, GRO-β, GRO-γ, GCP-2 and ENA-78 (epithelial neutrophil-activating protein 78) [1906]. The receptor CXCR2 is responsible for ELR+ angiogenesis [5]. Non-ELR CXC chemokines tend to be inhibitors of angiogenesis. IP-10 and Mig are angiostatic [1204, 1906]. Both cytokines bind receptor CXCR3 [2142]. The anticancer activities of several cytokines may involve the downstream production of angiostatic chemokines such as IP-10 and Mig [32, 52, 222, 1788]. Ephrins and ephs, their receptors, are also involved in cell migration. They act as chemodirectants during morphogenesis, inflammation and immune response. Ephrins and ephs are found on a wide variety of cells. In contrast with the chemokines, which mainly stimulate migration and adhesion, the ephrins are chemorepulsive agents which tend to be transiently expressed

204 at times when the movement of cells needs to be redirected. Chemokines are involved in many inflammatory diseases and in the development of cancer. Cell movement and angiogenesis are hallmarks of malignancy. Elevated levels of angiogenic chemokines are associated with tumor progression and metastasis [63, 976, 1167]. IL-8 production has been correlated with tumor vascularity and progression [976, 2250]. Chemokines are of interest in the design of therapeutic agents, including antitumor vaccines. For example, lymphotactin is produced by NK cells and attracts T cells [949]. A vaccine using tumor cells co-transfected to produce lymphotactin and IL-2, induced potent antitumor immunity in mice [432]. In another study, a vaccine with Lewis lung carcinoma antigen-pulsed dendritic cells, transfected to produce lymphotactin, induced a much more potent antitumor response than a control vaccine lacking lymphotactin. In mice with established tumors, vaccination with the antigen-pulsed lymphotactin-DCs inhibited metastasis. Only one relatively small 104 DC dose was required to immunize the mice [241].

Fas ligand Inducer of Apoptosis Fas ligand (FasL) is a transmembrane protein in the TNF family. It is expressed on activated lymphocytes and on a variety of other cells including certain tumor cells. In T cells, FasL is induced by TCR activation. Its production is inhibited by retinoids and glucocorticoids [2107, 2228], by inhibitors of protein kinase C and calcium mobilization [2107], and by cyclosporin [217]. Fas is the receptor for FasL [1410, 1839, 1976]. Fas (also known as Apo 1, CD95) is expressed on lymphocytes and many different types of cells including tumor cells. There are soluble forms of Fas; they are generated by alternative mRNA splicing [253]. The FasL– Fas system is responsible for the induction and regulation of programmed cell death in the peripheral immune system. Apoptosis is a way to regulate and terminate an ongoing immune response, or to eliminate useless or potentially damaging immune cells [1019, 1184].The importance of the FasL/Fas system in the regulation of lymphocytes can be seen in the autoimmune diseases and lymphoproliferative disorders in mice, associated with mutations in the FasL (gld) and Fas (lpr) genes [330, 1410, 1698, 1976]. Various types of cancer and tumor cell lines express FasL [135, 700, 1452, 1469, 1703, 1814, 1897]. The Fas–FasL

Cytokines system is involved in activation-induced cell death in lymphocytes. The tumor cells that express FasL are generally negative for Fas and tend to be resistant to apoptosis [700, 1468, 1469]. The expression of FasL may explain the general phenomenon of immune resistance (immune privilege), by which certain normal tissues (eye chamber, testis) and tumors are able to evade immune effector cells. Cells that express surface FasL may induce apoptotic death in lymphocytes [670, 700]. In tumor biology this idea has been referred to as “FasL counterattack.” in which infiltrating lymphocytes may be killed upon contact with FasL+ tumor cells [135, 1468, 1469]. This theory is interesting but controversial. Certain reports show that tumors expressing FasL may be rejected [61, 124, 519, 1778]. In transplantation research, some have tried to engineer graft tissues with FASL to make them less immunogenic but with they have met with variable success [31, 916]. Tumor cells may contain Fas. When this is the case, tumor development and therapy may be influenced by Fas-induced apoptosis. Dendritic cells express FASL, as well as other proapoptotic cytokines TNF, LTα1β2, TRAIL, and may kill tumor cells directly [1166]. CTLs express FASL. Irradiation was found to increase Fas on tumor cells and prior irradiation enhanced apoptotic response to adoptive CTL therapy [281]. Vitamin E stimulated Fas and Fas ligand levels in certain cultured breast cancer cells and induced death by apoptosis [2037]. In some leukemias and solid tumors, drugs such as adriamycin and methotrexate induce Fas and FasL causing death [566]. Capillary leak syndrome involves endothelial cell damage. It is associated with chronic infection and it is a dose-limiting toxicity in the use of IL-2 and certain other cytokines to treat cancer patients. Capillary damage appears to be due to cytotoxic lymphocytes [375]. Studies using perforin knockout mice and mice with defective FasL and Fas genes showed that both perforin and Fas-FasL were responsible [1612].

FLT-3 ligand Stimulator of Early Hematopoietic Stem Cells and Dendritic Cells Flt-3 ligand is a membrane-bound cytokine. In structure and activity, it is related to macrophage colony stimulating factor and stem cell factor [710, 1175]. The human gene is located on chromosome 19 [1176, 1265]. It is expressed by a wide variety of hematopoietic and nonhematopoietic tissues [710, 1176]. Flt-3 ligand is produced in both membrane bound and soluble forms, both active.

Walter M. Lewko and Robert K. Oldham Soluble forms are produced by proteolysis [1177] or alternative mRNA splicing [1176, 1265]. Soluble Flt-3 ligand is elevated in serum of patients with certain anemias [1179]. In patients on myelosuppressive chemotherapy, elevated plasma Flt-3 ligand is prognostic for poor recovery from thrombocytopenia [170]. Flt-3 (fms-like tyrosine kinase-3, CD135) is the receptor for Flt-3 ligand. It is a transmembrane protein. Flt-3 was named for its similarity to fms, the receptor for M-CSF [1679, 1680]. Flt-3 is also referred to as flk-2 (fetal liver kinase 2) [1251] and Stk-1 (stem cell tyrosine kinase-1) [1837]. It is a 158 kDa glycoprotein. The human gene is on chromosome 13q12 [1680]. This receptor is expressed mainly by hematopoietic stem cells and progenitor cells [1248]; it is low or missing on most mature cells [370, 1251, 1286, 1837]. Flt-3 ligand binds and activates the receptor. Dimerization of Flt-3 ligand appears to be required for receptor dimerization and signaling [710, 1177, 1178]. Flt-3 ligand has a role in the proliferation, survival and differentiation of hematopoietic progenitor cells [1269]. Mice lacking Flt-3 ligand have reduced numbers of myeloid progenitors, B-lymphoid progenitors, NK cells, and dendritic cells [1272]. Mice lacking Flt-3 appear healthy. However, their stem cells are deficient in their ability to reconstitute lymphoid and myeloid cells when transplanted into irradiated mice [1192]. Mice injected sc with Flt-3 ligand show a remarkable increase in hematopoietic precursors [193, 194]. Flt-3 ligand stimulates the growth and survival of early progenitor cells [909, 1298, 1448]. GM-CSF, IL-3, SCF, IL-11 and IL-12 are synergistic [909, 1298] while TNF-α and TGFβ are inhibitory [2068]. Flt3 ligand acts together with IL-7 or SCF to stimulate B cell development from progenitors in bone marrow and thymus [768, 823, 1272, 1424, 2067]. Flt-3 ligand has a remarkable influence on the development of dendritic cells. Mice treated with Flt-3 ligand produce greater numbers of dendritic cells [452, 1224, 1819, 1890]. Spleen cells with markers for dendritic cells went from less than 1% of total in controls to 20% in Flt-3 treated mice [1224]. DCs from treated mice expressed more costimulatory CD80 and CD86 [1890]. Patients treated with Flt-3 ligand, also showed a remarkable increase in dendritic cells [1221]. Flt-3 ligand and stem cell factor cooperate to induce recruitment and expansion of CD34+ CD14+ dendritic cell precursors (CFU-DC). Flt-3 ligand and SCF are not required for the differentiation step. Other cytokines, including GM-CSF, IL-4, TGF-β and TNF-α stimulate maturation of the expanded precursors [367]. Flt-3 ligand also stimulates the production of NK cells [194]. Treatment of mice increased the number of

205 NK cells in blood, bone marrow, spleen and liver [1555, 1801]. It appears to do this by stimulating proliferation of pro-NK cells and the production of mature, non-activated NK. Flt-3 ligand increases NK cell responsiveness. IL-2 rapidly induces proliferation, cytotoxicity and LAK activity in Flt3 ligand-treated cells [1801]. Flt3 ligand influences certain non-hematopoietic cells. Osteoclasts respond to M-CSF with increased differentiation; Flt-3 ligand can substitute for M-CSF [1069]. Neural stem cells express Flt-3; Flt-3 ligand inhibited EGF and FGF-2 induced proliferation. Neurons are also Flt-3+. In culture, Flt-3 ligand synergized with nerve growth factor to promote neuron survival [195]. Flt-3 is expressed by many myeloid and lymphocytic leukemias [157, 370, 1286, 453, 1271, 1678]. When cells are positive for the receptor, flt-3 ligand may stimulate growth in culture. In AML, 20–25% of adult patients have a mutation in flt3. This mutation is an internal tandem duplication. The presence of this mutation is an adverse prognostic factor. This is a gain of function mutation that confers growth advantage on the cells [2151]; signaling is constitutively activated [725]. Selective tyrosine kinase inhibitors are being tested in patients with flt3+ tumors. In a trial on elderly patients with AML, responses were observed for lestaurtinib (CEP701) in both mutated and wild type Flt3 tumors [989]. Tumor bearing mice treated with Flt3 ligand generate antitumor responses. Several preclinical studies have shown this in lymphoma, leukemia, and several types of solid tumors [283, 320, 499, 1183, 2097]. Soluble and membrane bound forms of Flt-3L were effective. Dendritic cells and CD8 T cells appeared to be responsible for antitumor activity though NK cells might also be involved [1546, 1555, 1804, 1826]. In a mouse model for metastasis, local irradiation plus subsequent Flt-3 ligand treatment enhanced survival. This appeared to be due to increased presentation of antigen derived from dying tumor cells. In vivo manipulation of dendritic cells was used to induce immune response in three mouse model tumors. Mice were treated with several daily Flt3 ligand injections to induce DCs, then with CG oligonucleotide to mature the DCs in the presence of tumor peptide antigen. Existing tumors were inhibited and the mice were protected against a new challenge [1490]. It should be noted again that Flt-3 ligand acts together with other cytokines. For example, Flt-3 ligand and CD40 ligand were shown to be synergistic in the induction of antitumor immunity. Blocking CD40 obviated the effect of Flt3 ligand [179]. Flt3 ligand does not directly influence the growth of most types of non-hematological tumor cells in culture, although it has been reported that neural crest tumors

206 express Flt-3 and that cell lines treated with Flt-3 ligand showed increased growth and decreased apoptosis [1999]. Flt-3 is an apparent site of immune suppression. Vascular endothelial cell growth factor is produced by many tumors; it is an angiogenic factor and it is also immunosuppressive. VEGF interferes with Flt-3mediated DC production. It appears to do so by inhibiting the activation of the transcription factor NF-κB [1483]. There is interest in Flt-3 ligand for the treatment of cancer patients undergoing stem cell transplants. Patients may be pre-treated with Flt-3 ligand to mobilize stem cells to increase the number available for harvest. Flt-3 may also be used to expand these cells in culture. Studies in normal volunteers and in cancer patients showed that Flt-3 ligand is relatively safe. Few side effects were observed [1098, 1221]. As seen in mice and other animals, Flt-3 ligand caused a remarkable increase in stem cells and dendritic cells in blood and other tissue sites [1221]. Flt-3 ligand is effective alone but most likely it will be used in combination with other cytokines such as G-CSF and GM-CSF [193, 194, 1920]. In culture, stem cells and progenitor cells may proliferate for several weeks when Flt-3 ligand is added alone or together with other cytokines such as IL-1, Il-3, Il-6, IL-11, IL-12, erythropoietin, SCF and thrombopoietin [381, 578, 872, 1564, 1568, 1860]. Flt-3 ligand appears to maintain the stem cells, to sustain long-term hematopoiesis after reimplantation [381, 1564]. Trials have begun in cancer patients, using Flt-3 ligand to treat patients or to generate dendritic cells for vaccination. In a preliminary study, colon cancer patients injected with Flt3 ligand showed increased lymphocytes in blood, increased percent dendritic cells in PBMCs and increased dendritic cells infiltrating tumors [1366]. In another report, patients were vaccinated with antigen-pulsed autologous dendritic cells. The patients were pre-treated with Flt-3 ligand to mobilize DCs. The DCs were harvested, loaded ex vivo with a peptide of carcinoembryonic antigen and then reinfused. The preliminary results were promising. Two of 12 patients showed dramatic regressions; one had a mixed response. Anticancer activity correlated with the generation of specific CD8 T cells [549].

Leukemia inhibitory factor T Cell Development, Regulator of Inflammation, Embryonic Development Leukemia inhibitory factor (LIF) is a member of the IL-6 cytokine family [2273]. It is a pleiotropic cytokine; many of its effects overlap with those of IL-6. LIF is produced by fibroblasts [2008], macrophages [51] endothelial cells

Cytokines [1168] thymic epithelium [1067] and synoviocytes [395, 249]. The gene for LIF is on chromosome 22q12 where it colocalizes with the gene of OSM. In immune cells, secretion of LIF is stimulated by endotoxin, IL-1 and TNF [1297]. In thymic epithelial cells, EGF and TGF-β stimulate LIF production [1743]. The receptor for LIF has two subunits, LIFRβ and the common gp130 utilized by IL-6 family cytokines [602]. LIF has a role in the production of CD4 and CD8 T cells. LIF is secreted by thymic epithelium [1067]. Too much or too little LIF causes abnormal T cell development [1295]. In transgenic mice that overproduced LIF, thymic epithelial architecture was disrupted and cortical thymocytes were decreased [1804]. In LIF deficient mice, thymocytes were produced but they were insensitive to ConA activation [498]. LIF regulates inflammation. Depending on the setting, LIF may be pro- or anti-inflammatory. LIF knockout mice showed abnormal inflammatory response in nervous tissues [579, 1926, 2003]. Injection of rLIF into skin and joints induces swelling and infiltration [248, 1277]. LIF is elevated in ulcerative colitis; LIF stimulates the growth of cancer cells and may thus have a role in the development of colon cancer associated with this inflammatory disease [622]. LIF is proinflammatory, but there is also evidence LIF can inhibit inflammation. In knockout mice lacking LIF, inflammation is exacerbated in footpads injected with Freund’s complete adjuvant. Delivery of LIF using an adenoviral vector suppressed inflammation [2296]. In psoriasis, LIF and IL-11 have similar depressive effects on inflammation and cytokine production [2022]. LIF is involved in septic shock. The blood of patients had elevated LIF as well as TNF, IL-1 and IL-6; the level of these cytokines was correlated with the severity of the disease [2077, 2118, 2119]. LIF and IL-6 appear to be induced by TNF-α [880]. Blocking antibodies for LIF depress the lethality of endotoxemia [166]. Interestingly, treatment of mice with LIF before a lethal dose of endotoxin favored survival of the mice [26, 2117]. This may be due to induction of acute phase proteins that have antiinflammatory, protective effects [1258]. LIF has growth, differentiation and metabolic effects in non-hematopoietic tissues [759, 1042, 1295, 1297]. LIF reversibly inhibits the differentiation of embryonic stem cells [1449]. In fetal pituitary corticotropes, LIF inhibits cell division, stimulates differention and increases ACTH production [1884]. LIF regulates neuronal differentiation and increases survival [1345]. It stimulates bone development and extracellular matrix metabolism. LIF regulates mammary cell growth and development [1137]. Maternal expression of LIF is required for blastocyst implantation [1892].

Walter M. Lewko and Robert K. Oldham Mice injected with LIF suffer weight loss associated with cachexia. Weight loss is a characteristic of several gp130 signaling cytokines, IL-6, IL-11, CNTF and NNT [1784]. LIF has some remarkable effects in cancer. As mentioned, it is required for normal immune and inflammatory response. In tumor cells, LIF has both negative and positive direct effects on growth. LIF was discovered based on its ability to arrest growth and induce differentiation in murine myeloid leukemia cells [604]. In cultured human glioma cells, LIF inhibits growth and induces astrocytelike differentiation [701]. But LIF can stimulate growth in many types of tumor cells including human multiple myeloma [2285] colon cancer [964], breast cancer [425, 500, 948] and prostate cancer [948]. Other cytokines in the IL-6 family similarly influence tumor cell growth based on gp130 signaling [2285]. There is interest in agents that regulate growth by this signaling pathway.

LIGHT Costimulatory Molecule; T Cell Activator; Inducer of Apoptosis LIGHT is a 240 amino acid cytokine that was first discovered in the cDNA library of activated T cells. It is a member of the TNF family [1044, 1254]. LIGHT is homotrimeric and it is produced in both soluble and membrane bound forms, both active. LIGHT is expressed by T cells, granulocytes, monocytes, immature dendritic cells and certain tumors [719, 1368, 1957, 1959, 2278]. LIGHT binds two receptors, HVEM (herpes virus entry mediator) and lymphotoxin β receptor (LTβR) [2278]. HVEM is a member of the TNFR family [1044, 1352, 1958]. It is the cell receptor for herpes simplex infection [1344, 1254]. HVEM is also referred to as TR2 (TNF-related receptor 2) [1044] and ATAR (another TRAF-associated receptor) [808]. It is a 283 amino acid transmembrane protein. Signaling involves TRAF binding and the activation of NF-κB, Jun N-terminal kinase and AP1 [808, 1231, 1254]. HVEM is localized on T cells, B cells, NK cells, monocytes, endothelial cells and immature dendritic cells [720, 1044, 1344, 1958]. Its levels are up regulated by cell activation and down regulated by LIGHT [1958]. HVEM is also a receptor for lymphotoxin-α [1254]. In T cells, LIGHT costimulates proliferation, cytokine secretion and surface protein levels [720, 1044]. Disruption of LIGHT, interferes with lymphnode formation, depresses T cell proliferation in a MLR, the secretion of IL-2, IFN-γ, IL-4 and TNF-α [720, 1739]. Disruption of LIGHT also prolongs allograft survival [2237].

207 As typical of TNF-family members, LIGHT induces apoptosis. Normally, only cells that express both HVEM and LT-β receptors are susceptible to LIGHT-induced cell death. No apoptosis was observed in cells expressing only one of them [719, 2278]. Because lymphocytes do not express LT-β receptor, LIGHT does not cause apoptosis in these cells. TR6 (also called DcR3) is another member of the TNF receptor family. TR6 is a soluble, non-signaling protein that binds both LIGHT and FasL and is, therefore, a decoy receptor. TR6 appears to have a regulatory role in LIGHT and FasL mediated cell death [2265]. LIGHT is expressed on immature dendritic cells. Engagement of LIGHT costimulates T cell proliferation. Blockade of LIGHT, using soluble recombinant receptors, inhibits DC-mediated allogeneic T cell response [1957]. LIGHT stimulates inflammatory response. Triggering HVEM together with toll-like receptors on neutrophils synergistically stimulates respiratory burst, degranulation, secretion of IL-8 and opsonization of particles [722]. At an early stage in liver regeneration, lymphocytes infiltrate the hepatic tissue. Hepatocyte cell division is stimulated and this depends on the expression of T cellLIGHT and liver cell-LTβR [45]. LIGHT costimulates T cell anticancer immunity. Typically immune cells express LIGHT but it is also found in melanoma cells and on microvesicles released from melanoma; co-culture of microvesicles with lymphocytes in the presence of IL-2 costimulated CD8 T cell proliferation and apoptotic death in the melanoma cells [1368]. Human breast cancer cells transfected with LIGHT cDNA triggered immune response and regression in an in vivo model system [2278]. NK cells express HVEM; tumor cells that express LIGHT activate NK cells to kill tumors in a manner that requires IFNγ and CD8 cells. The NK cells provided help (IFN) in the activation of CTLs [509]. With respect to apoptosis, LIGHT triggers cell death in tumor cells. Normally, two receptors (HVEM and LTβR) are required for LIGHT-induced apoptosis but in tumor cells only one, the LTβR, was necessary [1662].

Lymphotoxin-a (Tumor Necrosis Factor b) Lymphoid Organogenesis; Inflammation; T Cell, B Cell, Bone Cell Development Lymphotoxin α (LT α) was discovered in the conditioned medium of activated T cells [505, 1078, 1695]. It was named for its lymphocyte origin and its toxicity to certain cells. The gene for human LTα is on chromosome 6,

208 close to the TNF-α gene. LTα is a TNF family member; it is also referred to as TNF-β [9, 1553]. LTα is produced by Th1 cells, CD8 T cells, early B cells, NK cells and also by astrocytes. LTα is synthesized as a 202 amino acid precursor with a signal peptide and it is cleaved to 171 and 194 amino acid forms [9]. LTα selfassociates to form homotrimers (LTα3) with a conformation similar to TNF-α. It is a soluble cytokine. The homotrimer binds both TNFRI and TNFRII [209, 212, 777, 1112]. Because the TNFRII-LTα3 complex does not signal, for LTα3 TNFRII is a decoy receptor and an antagonist [1281]. LTα3 also binds herpesvirus entry mediator (HVEM), a receptor for LIGHT [1254]. Lymphoid organ development depends on LT-α and other cytokines such as LT-β, TNF-α and LIGHT. LT-α(−/−) mice, were born without lymph nodes or with defective nodes. Peyer’s patches were also lacking. Spleen histology was abnormal [110, 419, 1004, 1706]. Both LT-α and LT-β appeared to be required for normal lymphoid organogenesis [1249, 1445, 1636]. LT-α and TNF-α are involved in the formation of B cell follicles, T and B cell segregation, follicular dendritic cell clustering and the formation of germinal centers. Mice deficient in either LT-α or TNF-α failed to form germinal centers [502, 2110]. LT-α (−/−) mice have impaired effector T cells. These mice were much more susceptible than controls to HSV infection. CD8 T cells were induced normally but their effector functions were depressed. The cells failed to become CTL and did not secrete INF-γ when stimulated with antigen [1035]. LT-α was also required for the development of memory B cells and their capacity to respond to antigen [571]. LT-α has a major part in inflammation. It induces the expression of leukocyte adhesion molecules VCAM-1 and ICAM-1 on endothelial cells [265, 1581]. In a mouse model, antibodies to LT-α and TNF-α prevented allergic encephalitis [1694]. Transgenic mice overexpressing LT-α have remarkable inflammation in the sites of targeted expression. The infiltrate consists of T cells, B cells, macrophages, and dendritic cells [1020, 1569]. TNF receptors were studied in this system. Mice lacking TNFRI failed to develop inflammation. TNFRI appears to be the primary receptor involved in LTα-induced inflammation. Lack of TNFRII did not did not influence inflammatory response. Lack of the related cytokine lymphotoxin β did not prevent inflammation but altered the response [1705]. LT-α is involved in bone and tooth metabolism. TNF-α and LT-α stimulate osteoblast and osteoclast activity [1988]. IL-1 acts synergistically with TNF

Cytokines to stimulate bone resorption [1883]. In a model for periodontal disease, soluble recombinant receptors for IL-1 and LT-α, acted as antagonists and depressed recruitment of inflammatory cells, osteoclast activity, bone loss and periodontal destruction [83].

Lymphotoxin-b Lymphoid Organogenesis; Inflammatory; NK, Dendritic Cell Development Lymphotoxin-β (LT-β) is a 33 kDa transmembrane protein that was originally cloned from a T cell hybridoma [212, 685]. It is related to LT-α in structure and function. LT-β is expressed mainly on activated T cells, B cells and NK cells [2116]. LT-β chains form homotrimers and heterotrimers with LTα; LTα1-LT-β2 is the major form [209, 212, 777, 2116]. LT-β binds the LT-β receptor (LT-βR). This receptor is related to the TNF receptors. It binds LT-β in its trimer and heterotrimeric forms; it does not bind TNF-α or the LT-α homotrimer [209, 211, 212, 355, 766]. LIGHT is also a ligand for the LT-βR [2278]. Follicular stromal cells, monocytes, fibroblasts, smooth muscle and skeletal muscle cells express the LT-βR. It is also on human melanoma and adenocarcinoma cell lines [211, 402, 2051]. LT-β, LT-α, TNF-α and LIGHT are all critical in the development of lymphoid organs [1249, 1445, 1636, 1739]. LT-β was also required for the homing of dendritic cells to lymph nodes [2206]. LT-β induces IFN-β and this promoted survival of lymphocytes during murine cytomegalovirus infection [110]. LT-α and LT-β stimulate the development of NK cells. LT-β(−/−) mice had fewer NK cells [841, 861, 1846] and LT-βR was required for normal NK development [841, 2205]. The effect of LT-β was not dependent on IL-15, another essential cytokine in NK maturation [841]. It appeared that an effect of LT-β on marrow stromal cells was critical for an early step in NK development [2205]. LT-α and LT-β are required for the normal development of NK T cells. These cells are important in that they may be stimulated to quickly produce large amounts of IL-4, IFN-γ, and IL-10. They are involved in certain types of antitumor activity, the prevention of autoimmunity and protection against bacterial and parasitic infections. Mice that are LT-α(−/−) and LT-β(−/−) have reduced NK T cells and they are low in IL-4 and IL-10. Both LT-α and LT-β are needed suggesting LT-α1β2 (not the homotrimer) is the active form [483].

Walter M. Lewko and Robert K. Oldham LT-β has both cell mediated and direct effects on cancer. It is required for normal production of dendritic, NK, NK T and LAK cells. Mice lacking the LT-βR showed enhanced tumor growth and metastasis [861]. Direct LT effects have also been observed in certain human adenocarcinoma cells that have the LT-β receptor. Signaling through the LT-βR induced cell death in culture and arrested tumor growth in vivo [211, 1194]. Human melanoma cell lines also express the LT-βR. When the receptor was activated, growth was inhibited and proinflammatory cytokines were secreted [402].

Novel neurotrophin B Cell Development; Regulator of Inflammation Novel neurotrophin (NNT) is a member of the IL-6 cytokine family. It is also referred to as B cell stimulating factor-3 and cardiotrophin-like cytokine. NNT is a 225 amino acid protein. It is homologous with IL-6 family members, in particular cardiotrophin-1 (CT-1) and ciliary neurotrophic factor (CNTF). The gene for NNT is on chromosome 11q13 where it is close to the gene for CNTF (11q12). mRNA for NNT is produced by lymph nodes and spleen and to a lesser extent by other tissues [1783, 1808]. The receptor for NNT contains ciliary neurotrophin Rα, gp130 and LIFRβ. Signaling, involves the JAK/STAT pathway and the activation of STAT-3. In this way NNT resembles other IL-6 family members [384, 1088]. NNT stimulates B cells. Increased B cell production and secretion of IgM, IgE, IgG was observed in mice treated with NNT [1784, 1783]. These mice suffered weight loss. NNT, like certain other IL-6 family members, induces cachexia. As its name implies, this cytokine is stimulates nerve growth. In culture, NNT increased the survival of chick embryo neurons [1784]. Gene deficiency studies showed that NNT and the ciliary neurotrophic factor receptor were required for motor neuron development [396, 1099]. In mice, NNT induced the production of serum amyloid A protein. It also potentiated IL-1-induced secretion of glucocorticoids. Many of these effects are shared with certain other members of the IL-6 family, but there are differences. NNT was characteristic in that it did not induce hematopoiesis; NNT induced growth of M1 macrophage cells whereas IL-6. LIF, OSM and CT-1 inhibited M1 growth and induced differentiation [1784].

209

Oncostatin M Lymph Node/T Cell Development; Inflammation; Growth and Wound Repair Oncostatin M (OSM) is a 28 kDa cytokine. It was discovered in the conditioned medium of lymphocytes as a factor capable of inhibiting certain cancer cells [207, 1210, 2274]. Activated T cells, monocytes and neutrophils produce OSM [207, 213, 666, 826]. The gene for OSM is on chromosome 22q12 where it colocalizes with the gene for LIF. It is a member of the IL-6 cytokine family that utilizes gp130 as a receptor component [1664, 2273]. In humans, OSM binds and signals through two receptors. The first is the receptor for LIF, gp130-LIFRβ. It is responsible for effects induced in common by OSM and LIF [601, 602]. The second is gp130-OSMRβ, which is a specific OSM receptor and is responsible for the effects particular to OSM [1373, 1984]. OSM receptors are on a variety of cells including tumor cells. The OSM mechanism of signaling involves MAP kinase, JAK-STAT and the PIP3-kinase pathways [38, 99, 837, 1009]. Oncostatin M has remarkable effects on lymph node development and the production of lymphocytes. Thymus is a key site for T cell processing. But even in athymic animals a certain amount of T cell production occurs in bone marrow, liver, intestine and in lymphnodes. In transgenic mice overexpressing oncostatin M, thymus atrophies and T cells (immature and mature) accumulate in the lymphnodes [175, 325, 1209]. High OSM endows lymph nodes with the ability to sustain T cell development. OSM also mobilizes lymphocytes causing them to move into lymphnodes and to recycle into circulation. OSM has multiple effects related to wound repair and inflammation. It is a growth stimulator for fibroblasts [793] and vascular smooth muscle cells [679]. OSM is a fibroblast activator. It stimulates growth of 3T3 cells, dermal fibroblasts and synoviocytes [694]. OSM increases the production of extracellular matrix collagen [836, 837] and glycosaminoglycan [469]. It stimulates the production and activation of collagenases that degrade the extracellular matrix [705, 1644]. Lytic enzymes and collagen metabolism are part of the growth process in connective tissue. OSM also increases IL-6 production in fibroblasts [208] which itself stimulates fibroblast mitosis and collagen production [468]. Transgenic mice that overproduce OSM have developmental abnormalities and visceral fibrosis [1209].

210 OSM has both stimulatory and regulatory effects on inflammation. It is increased in the synovial fluids of rheumatoid arthritis patients [817]. In a mouse model for RA, OSM appeared to suppress inflammation and tissue damage [2092]. It stimulated the production of acute phase proteins, which are known to have antiinflammatory activity. [1642]. In fibroblasts, OSM inhibited the production of IL-1-stimulated proinflammatory cytokines IL-8 and GM-CSF [1643]. OSM also increases fibroblast production of tissue inhibitor of metalloprotease (TIMP) [1644], which inhibits collagenase activity and tissue destruction. On the other hand, OSM has been shown to have proinflammatory effects. When injected into joints, it caused cartilage resorption and inhibited proteoglycan production resulting in tissue damage [127]. And OSM alone, and together with IL-1 and TNF-α, stimulates production of several matrix metalloproteinases in cartilage [356, 1009]. As implied by its name, OSM has been shown to inhibit growth in several cancers including melanoma [207, 2274], myeloid leukemia [213], glioma cells [702] and breast cancer [1137]. There is interest in OSM for these cytostatic effects and for its role in immune response. But OSM has not been tested clinically. It should be noted, OSM is a growth factor for Kaposi’s sarcoma [1308]. Certain of its proinflammatory effects might exacerbate infiltration and angiogenesis [1605]

Osteopontin Pro Th1, Nitric Oxide Synthetase Inhibiting Cytokine Osteopontin (OPN) is a secreted phosphoglycoprotein. It is also referred to as early T lymphocyte activation protein-1 (Eta-1). OPN is produced by activated T cells, macrophages, osteoblasts, endothelial cells, brain and certain epithelial cells. Its expression is increased by IL-1, IFN-γ TNF-α, bFGF, phorbol esters, glucocorticoids and 1,25 dihydroxyvitamin D3 [79]. OPN is also produced by transformed cells [1785]. There are two receptors for osteopontin, integrin αVβ3 on endothelial cells, fibroblasts and other nonhematopoietic cells, and CD44 that is on leukocytes [79, 694]. The synthetic peptide GRGDSP blocks integrin binding and activation [694]. Integrin αVβ3, CD44 and osteopontin are cell surface extracellular matrix components which function structurally and in signaling. OPN has an important role in bone growth and remodeling. OPN binds osteoclasts and functions in osteoclast recruitment. OPN is a regulator of hydroxyapatite depo-

Cytokines sition for bone calcification [82, 182, 413]. OPN is not normally present in soft tissues, but it does accumulate at sites of abnormal calcium deposition, such as atherosclerotic lesions and calcified heart valves [542, 1875]. OSN appears to be controlling calcium deposition, for in OSN deficient mice, vascular calcification is exacerbated [1867]. In bone marrow, OPN appears to control stem cell migration and the size of the stem cell pool to prevent excessive expansion [1456, 1893]. Osteopontin controls the activation of T cells. It favors Th1 immune response [79]. Mice deficient in OPN fail to develop Th1 immunity during viral and bacterial infection; production of IL-12 and IFN-γ is decreased while IL-10 is increased [79]. Attenuation of experimental autoimmune encephalitis, a Th1-related disease, was observed in OPN deficient mice [881]. OPN appears to stimulate Th1 response at the level of dendritic cells. OPN promotes migration of dendritic cells from tissue sites to lymphnodes; it induces TNF and IL-12 (Th1) cytokines; and it increases adhesion and costimulatory molecules [1635]. Though it favors the Th1 pathway, OPN stimulates B cell proliferation and Ig production. Osteopontin is involved in acute and chronic inflammation. It has chemotactic, pro-inflammatory effects but it also has prominent regulatory functions. Elevated OPN levels have been observed in atherosclerosis [87], glomerulonephritis [816] and in granulomatous diseases [1430]. During heart failure, increased OPN levels are observed in myocardial cells [1831]. In a mouse model for rheumatoid arthritis, OPN appeared to cause joint destruction by promoting angiogenesis and cartilage cell apoptosis [2268]. However, OPN depresses nitric oxide synthetase and NO production in macrophages [694, 1657], kidney epithelium [814] and endothelial cells [1771]. Inhibition of nitric oxide appears to be a major regulatory function of OPN limiting damage during inflammation. In endothelial cells, OPN acts as a survival, cell adhesive and chemotactic factor. It organizes angiogenesis. Fibroblast growth factor 2 (3, 1068) stimulates OPN production by endothelial cells. In turn OPN induces monocyte chemotaxis. Tissue becomes infiltrated with monocytes. OPN stimulates monocytes to produce TNF-α and IL-8, which are both angiogenic [1068]. This mechanism could have a role in normal wound repair or in pathology such as cancer. Several properties of OPN may contribute to cancer cell growth and behavior. Variable osteopontin levels are observed in cancer. Increased OPN secretion was associated with decreased nitric oxide production and decreased killing of tumor cells by macrophages and

Walter M. Lewko and Robert K. Oldham endothelial cells. In this way, OPN may have a role in immune escape by cancer cells [413]. OPN also induces cyclooxygenase, and the progression of prostatic cancer [877]. OPN induces monocyte secretion of IL-1β [1421] and other growth and proangiogenic factors. OPN is expressed by normal brain and astrocytoma cells; it increases astrocytoma cell migration [440]. Hepatocyte growth factor activates a genetic program in epithelial cells for cell dissociation, growth and invasion. This program is upregulated during progression in many tumors. HGF induces osteopontin; antibody studies suggest that OPN mediates HGF-induced invasive behavior [1280]. Melanoma produces OPN; in melanocytes OPN functions as an antiapoptotic survival factor [608]. Osteopontin has been observed in many breast cancers. Its presence is often associated with calcification. Several studies have related osteopontin accumulation in breast cancer with decreased survival [770, 1696, 1834, 2036].

OX40 ligand Costimulation in T Cell, B Cell Development/Memory; Inflammation OX40 ligand (OX40L) is a member of the TNF family. It is a 32–34 kDa, 183 amino acid, membrane bound glycoprotein. OX40L is expressed mainly on dendritic cells [632, 1511], B cells [1908], endothelium and activated T cells [117, 851, 1571]. OX40 (CD134) is the receptor for OX40L. It is a 48 kDa, 250 amino acid, membrane glycoprotein. OX40 was originally described in CD4 T cells as a surface antigen, which was similar to the nerve growth factor receptor [1213, 1542]. It is found only on activated T cells [232, 2000]. Normally, its levels are very low and rise following activation [232, 655]. OX40 signaling involves TRAF-2, TRAF-3 and NF-κB [62]. The OX40L–OX40 system functions as a costimulator during antigen presentation for the activation and increased longevity of T cells, in particular CD4+ Th cells. Mice deficient in OX40 signaling show reduced T cell response to infection. B cell response appears to be normal [294, 1006, 1396, 1571, 2000]. OX40L–OX40 interactions occur in addition to B7-CD28 signaling [111, 660, 386, 887, 2243] between AP and T cells. OX40L acts synergistically with B7 to costimulate CD4 Th cell expansion and the secretion of IL-2, IL-4 and IL-5 [655]. OX40L was required for priming [1436] and sustained later stage CD4 T cell proliferation and memory [654, 655].

211 OX40L is capable of reverse signaling back into the cells that express it [1511, 1908]. In intermediate stage dendritic cells, OX40L ligation, by interaction with T cells or by agonist Mabs, caused reverse signaling to the dendritic cell, enhancing maturation and the secretion of cytokines TNF-α, IL-12, IL-1β and IL-6 [1511]. B cell-deficient mice produce a poor T cell response [1141]. B cells function during antigen presentation; they appear to stimulate T cells after their initial contact with DCs. OX40L has a role in this process. OX40L is expressed on splenic B cells. When B and T cells interact, OX40 engagement stimulates T cell growth and IL-2 release [1908, 1909]; reverse signaling through OX40L on the B cells induces B cell growth and differentiation. OX40 ligand is found mainly on antigen presenting cells. However, OX40L is also present on CD4 T cells and it appears to have a role in T cell response [1862]. When activated in culture, T cells that were genetically deficient in OX40L proliferated less than normal T cells and when they were transferred back into mice, survival was reduced [1862]. It thus appears that T cell OX40L provides additional signals to sustain CD4 T cell longevity. OX40 ligand has been shown to shut down IL-10 producing regulatory T cells. OX40 L inhibited the generation of the regulatory cells and additionally it inhibited IL-10 production in differentiated IL-10 producing regulatory T cells [865]. OX40L is expressed on vascular endothelial cells. It may function during inflammation in the binding and extravasation of activated OX40-expressing T cells [851]. The OX40–OX40L system appears to be involved in several inflammatory diseases including allergic encephalomyelitis [1436, 2134], graft versus host disease [1909, 1910, 2000], inflammatory bowel disease [751] and rheumatoid arthritis [215]. In certain cases, amelioration of the disease has been demonstrated when the animals were treated with anti-OX40 antibodies [751, 1910, 2134]. Exacerbation of inflammatory disease has been shown in transgenic animals overexpressing OX40 [1436]. Tumor infiltrating lymphocytes were also positive suggesting a role for OX40 in host response to cancer [472, 2073]. There is interest in costimulatory cytokines as adjuvants during vaccination. OX40 ligation by agonistic antibodies promoted memory with increased survival of specific T cells [655]. OX40 costimulation could even reverse established anergy [112]. It has been shown that OX40 signaling by several means enhanced immune response during cancer vaccination [27, 44, 379, 669, 836, 914, 1362, 1529] OX40 costimulation together

212 with GM-CSF was able to produce a strong response to the naturally occurring Her2/neu tumor antigen, capable of inducing regression in established tumors [1397]. OX40L and OX40 are on HTLV-infected T cell leukemias and the virus regulates expression. OX40L and OX40 may be involved in the development and growth of this cancer [117, 1321].

RANKL/TRANCE B Cell, DC, Osteoclast Development, Lymph Node Organogenesis RANKL (receptor activator of NF-κB ligand) is a membrane bound, TNF-related protein, It functions in the development of osteoclasts, lymphocytes and in lymph node organogenesis [450, 1003]. RANKL is also referred to as TRANCE (TNF-related activation-induced cytokine), osteoclast differentiation factor [2235] and osteoprotegerin ligand. RANKL is expressed on T cells [48, 903, 1003, 2193, 2194], B cells [2269], dendritic cells [48, 2192] and bone marrow stromal/osteoblast cells [48, 1950, 2269]. In T cells RANKL levels increase with TCR activation [2106]. RANK and osteoprotegerin (OPG) are receptors for RANKL. They are membrane-bound proteins and members of the TNFR family. RANK is found on a variety of cell types, in particular, osteoclast precursors [1003] dendritic cells [48, 1003, 2193, 2221] and B cells [2269, 2270]. OPG is also referred to as follicular dendritic cell-derived receptor-1 and osteoclastogenesis inhibitory factor [218, 825, 2221, 2235]. OPG has membrane bound and soluble forms [2221, 2269]. OPG and RANK are both upregulated by CD40L, an important cytokine in germinal center and B cell development [2269]. RANK is the active receptor, which induces response in target cells; OPG is a non-signaling decoy receptor that competes with RANK [1813, 2270]. Inhibitory activity is mainly associated with soluble form of OPG. The function of the bound form is not certain. There is a report that it may be able to induce apoptosis [2221]. Other investigators were unable to detect any signaling [2269]. RANKL has several functions in the immune system. In dendritic cells, it stimulates antigen presentation [48, 903, 1003, 2192], Bcl-XL antiapoptotic activity and survival [2193]. OPG suppresses this [2270]. The dendritic cells from OPG-deficient mice are altered in that they are activated and show increased capacity to stimulate T cells [2270]. RANKL stimulates normal B cell development. OPG also regulates this process. Mice lacking

Cytokines OPG have altered B cells; transitional B cells are increased and proB cells are more sensitive to IL-7 growth stimulation [2270]. RANKL is a morphogenesis factor; it is involved in the early development of lymphnodes. Mice deficient in RANKL and RANK had abnormal lymphnode development and B cell production [416, 1003]. Estrogens tend to inhibit B cell lymphopoiesis during pregnancy [970]. Estrogens stimulate stromal cell secretion of factors that are inhibitory [1845]. Estrogens also stimulate the production of OPG [778]. RANKL stimulates osteoclast maturation and bone development. Osteoprotegerin regulates osteoclast activity [1050, 1828, 2221]. Macrophages and osteoclasts share a common lineage [517]. Peripheral blood monocytes cultured with RANKL, G-CSF and TGF-β formed osteoclasts [807, 913, 1793]. B cells may also be involved in osteoclast development. B cells are a source of stimulatory RANKL. B-lymphoid progenitor cells are also a source of osteoclast precursor cells [1215]. Mice lacking the RANKL and RANK have problems with bone and vascular development. The mice lack osteoclasts and develop osteoporosis [218]. Mice deficient in OPG are viable but osteoclast activity goes unchecked and as they age, the mice develop severe osteoporosis [1328, 2270]. While little has been done with the RANK/RANKL system in cancer, there is interest in costimulatory molecules that may enhance anticancer immune response. It has been shown that DNA vaccines that include the RANKL gene and dendritic cell vaccines that express RANK/RANKL produce more potent T cell responses [1322, 2155]. It may be that controlling OPG will be useful during immune therapy and vaccination [2270].

Stem cell factor Early Progenitor and Mast Cell Growth Factor Stem cell factor (SCF) was discovered in rat liver as a protein responsible for the outgrowth of very early progenitor cells in bone marrow [2305]. SCF is also referred to as kit ligand, steel factor and mast cell growth factor [47, 345, 2006, 2169]. There are two forms of SCF, soluble and membrane bound, produced by alternative splicing of the same pre-mRNA [47, 345, 2006, 2007]. Several types of cells express SCF, including bone marrow stroma, fibroblasts, liver and spleen [1244, 1248]. The receptor for SCF turned out to be the product of the protooncogene c-kit [47, 345, 543, 2169, 2304].

Walter M. Lewko and Robert K. Oldham This receptor is a protein tyrosine kinase [2219]. It is found on stem cells, progenitor cells and mast cells [1947, 2033, 2143]. A ligand-induced dimerization is part of the receptor activation process. SCF induces the downregulation of its own receptor by internalization [2238]. SCF stimulates growth of early progenitor cells (hematopoietic, lymphoid, and myeloid). Other cytokines induce differentiation and SCF may act synergistically with them [373, 2007, 2033]. SCF has a particularly remarkable effect on mast cells. Mice genetically deficient for SCF suffer anemia and are very deficient in tissue mast cells [609, 977, 978]. SCF acts on early mast cell progenitors to stimulate outgrowth. IL-3 acts at a later stage to stimulate further growth and antiparasite activity [2266]. SCF depresses apoptosis and thus serves as a mast cell survival factor [834]. rhuSCF injected sc into patients activates mast cell degranulation and proliferation with a wheal and flare response at the injection site [346]. Mast cells and SCF may be involved in fibrosis. Fibroblasts are a major source of SCF. Mast cells stimulated by fibroblast SCF release histamine and eotaxin, the eosinophil chemokine [780]. SCF also stimulates mast cell adhesion to fibronectin of fibroblasts and other cells [382]. Mast cells induce fibroblasts to produce collagen. Protracted inflammation produces fibrosis [322, 1105]. In this way SCF may be involved in the development of fibrotic reactions characteristic of chronic inflammatory disease and tumors. In humans, IL-4 depresses the growth and survival of mast cells by down regulating the expression of c-kit [1824]. γδ T cells appear to have a role in innate and adaptive response to viruses and other parasites [1782]. The proliferation of γδ T cells appears to depend on SCF. Mice lacking SCF receptor lacked intestinal γδ T cells while αβ T cells were not affected [1054]. SCF and its receptor are produced by several different types of tumors [1244, 1427] and may stimulate growth. Tumors that have tested positive for c-kit and for SCF include small cell lung carcinoma [748, 1701, 1781], breast [1426], testicular [1907], uterine, cervical and ovarian cancer [853] and melanoma [1428]. While it is not unusual to have the same cell express both the cytokine and its receptor, SCF will usually influence tumor growth by a paracrine mechanism. In this way the normal fibroblast component of a tumor could serve as the source of SCF for c-kit+ carcinoma cells. For therapy, it is possible that SCF blockade may inhibit tumor growth or that presence of this cytokine or c-kit on tumor cells may be used to target antibodies, drugs or toxins. Interestingly, loss of c-kit expression has been observed

213 with progression in breast cancer [1426] and melanoma [1428] reminiscent of the loss of estrogen receptor, which occurs with progression in breast cancer. SCF is being tested for its ability to synergize with G-CSF (filgrastim) to mobilize CD34+ progenitor cells into peripheral blood. It has been shown that SCF in combination with G-CSF may be useful to stimulate hematopoietic recovery after chemotherapy [506, 2124]. SCF with G-CSF also decreased the number of aphereses needed to obtain progenitor cells for autologous transplantation [562].

Tumor Necrosis Factor a Inflammation, Immune Regulation, Apoptosis, Endothelial Damage TNF-α was first described in 1975 as a factor found in animals treated with BCG or LPS. It was named for its ability to induce hemorrhagic necrosis in tumors [250, 661, 2174]. TNF-α was later found to be identical to cachectin, a factor responsible for metabolic wasting in patients with advanced cancer or infection [150–153]. Human TNF-α exists in both soluble and membrane bound forms [1549]. The soluble 17 kDa protein is generated from the 26 kDa membrane-bound form by a protease, TNF-α converting enzyme (TACE) [161, 1377]. TNF-α forms a trimer in solution [75]. The soluble form is more potent and appears to be responsible for most TNF-α bioactivity. The membrane-bound form is also active; it binds and signals through its receptor and by reverse signaling back into its parental cell [91, 714, 753]. TNF-α is produced by a number of different types of activated cells including macrophages, T cells (CD4+ Th1 and CD8+) [634] and B cells [2029, 2116], dendritic cells [2293], neutrophils [2069], adipocytes [954], keratinocytes [1135], mast cells [158, 644], mammary epithelium [2049], colon epithelium [907], pancreatic β cells [2220], osteoblasts [1330], astrocytes [1077], neurons [1972] and steroid-producing adrenal cells [637]. Pathogen molecules such as LPS and bacterial DNA stimulate TNF production in macrophages [241, 1304, 1866, 1876]. TNF-α expression increases with activation of T cell receptors [634] and B cell receptors [2029]. TNF-α production is well regulated. In macrophages, for example, LPS induces TNF-α; then TNF induces IL-10 [1579, 2114] and IL-10 feeds back on TNF-α and other inflammatory cytokines [613, 802] in a regulatory loop. Release of TNF-α from macrophages is inhibited by glucocorticoids, progesterone [1309], and

214 by estrogens [288, 1614, 1796]. Glucocorticoids are well known antiinflammatory agents. Progesterone has some glucocorticoid activity; antiinflammatory effects may be beneficial during pregnancy. There are at least three receptors for TNF-α. TNFRI (55 kDa) and TNFRII (75 kDa) bind both TNF-α and LT-α. A third receptor, described in liver, binds TNF-α but not LT-α [1760]. Nearly all mammalian cells express TNFRI [659]. It appears to be responsible for most TNF-α effects [2094]. The cytoplasmic part of TNFRI contains a death domain that is involved in apoptosis. TNF-α signaling also involves activation of NF-κB and p38 MAP kinase pathways, which induce inflammation and other non-apoptosis responses [2066]. TNFRII preferentially binds membrane bound TNF-α [665]. TNFRII lacks a death domain though clearly it stimulates apoptosis [1976, 2288]. It seems that TNFRII does not induce apoptosis directly but rather it cooperates with TNFRI; a complex is formed which induces apoptosis (397). Mice lacking TNFRII appeared to develop normally but were less sensitive to TNF-α and its toxicity [495]. TNF receptors I and II are shed from cells and found in tissue fluids [493, 1060]. The soluble receptors are generated by the protease TNF receptor releasing enzyme [659, 738, 925, 1389, 1464, 1844]. Production of shed TNFR is specific and regulated. Activation by LPS or by TNF-α itself induces TNFR shedding from many types of cells [131, 344, 1083, 1587, 1889]. In patients with inflamed livers, soluble TNFR levels were correlated with disease severity [2184]. Shed receptors bind TNF-α and act as competitive antagonists. The soluble receptor thus has an antiinflammatory effect [892, 1889]. IL-10, an antiinflammatory and immunosuppressive cytokine, stimulates the release of soluble TNFR from monocytes as part of its mechanism of action [905]. TNF stimulates the secretion of a number of cytokines including TNF-α itself, IL-1, IL-6, IL-8, IFN-γ, GM-CSF, M-CSF, PDGF, IL-10 and NGF. Directly or indirectly, it increases the expression of several growth factor receptors, adhesion molecules, collagenases and plasminogen activator. TNF-α and IL-1 are key proinflammatory cytokines. They share several biological functions [150, 152, 1498] even though they are not related molecularly nor do they share receptors. It appears that both cytokines, on binding their receptors, activate several downstream protein kinases in common [691, 698]. TNF-α has a remarkable ability to induce death by apoptosis in many different types of cells for its role in the regulation of morphogenesis, inflammation and immune response [1726]. When TNF binds RI and RII, death domains are activated [1965, 2094]. p38

Cytokines MAPK and NFκB are also activated. Apoptosis is induced by a caspase protease cascade, starting with caspase-8. The caspases clip and activate a series of enzymes and other proteins, producing the morphology and DNA fragmentation observed in apoptotic cells [75, 2094]. TNF-α also induces Fas expression in cells such as CD4+ T cells, another way in which it causes cell death by apoptosis [2292]. TNF-α not only induces apoptosis but it also regulates it. Activation of NF-κB by TNF-α induces antiapoptotic survival factors that interfere with caspase activation (691). TNF signaling induces death and NF-κB, independently. Sensitivity to TNF-induced apoptosis was enhanced in cells that were not able to activate NF-κB. Thus TNF-α stimulates apoptosis and later suppresses it [2050, 2099]. TNF-α influences many processes in immune response. In dendritic cells, TNF stimulates maturation, activation and antigen presentation for the induction of specific T cells [1648]. TNF stimulates IL-12 secretion in macrophages and other cells; IL-12 enhances T cell development. In T cells, TNF-α and IL-1 together induce Th1 development and secretion IFN-γ [1809]. In many target cells, TNF-α and IFN-γ stimulate MHCI expression to enhance antigen presentation and susceptibility to CTL-induced killing [1515]. TNF-α is a major stimulator of outgrowth in γδ T cells. This response was correlated with TNFRII levels [1053]. TNF-α has a major part in the control of certain infections. For example, TNF-α works together with γ-IFN and IL-4 on macrophages to control tuberculosis [545]. In part, this is due to the induction of nitric oxide synthetase [126, 1729]. TNF-α also induces apoptosis in the mycobacteria-laden macrophages, sequestering the pathogens in apoptotic bodies [140, 457]. In neutrophils, TNF-α increased complement receptor CD11b, adhesion to endothelium, release of reactive oxygen, degranulation, phagocytosis and ADCC [586, 983, 1429, 1792]. TNF-α also increased cellular leukocyte adhesion molecules such as ICAM-1, VCAM-1 and E-Selectin in endothelium [1193], renal tubule epithelium [2209] and in liver [2184]. These adhesion molecules function during tissue infiltration to direct effector cell migration and activity. In capillary endothelium, TNFα is angiogenic and functions in wound repair [1084]. TNF stimulates fibroblast growth and enzyme secretion associated with vessel formation [698]. However TNF-α also causes damage and it is believed to be responsible for vascular leak syndrome [458, 1607]. TNF-α is involved in bone metabolism. TNF-α is produced by osteoblasts; it stimulates osteoblast mitosis [1330] and bone resorption by osteoclasts [1988].

Walter M. Lewko and Robert K. Oldham TNF-α is produced by lipocytes and it may have a role in obesity. TNF-α mRNA levels are increased in the lipocytes of obese patients; levels decrease with weight loss [954]. TNF-α is involved in inflammatory and autoimmune diseases. Most of the deleterious TNF effects appear to be mediated by TNFRI [37, 1685]. In septic shock, LPS and bacterial DNA act synergistically to stimulate TNF-α production [590]. Mice treated with recombinant soluble TNF receptor are protected from toxicity and death [1100]. Collagen-induced arthritis was attenuated in mice treated with antibodies to TNFRI and in mice genetically deficient for TNFRI [1355, 1991]. A protease inhibitor which blocks both TACE and matrix metalloproteases (induced by TNF) produced good responses in rat arthritis models [343]. Antibodies to TNF-α (Infliximab, Etanercept) have been approved for use in patients with rheumatoid arthritis and are being tested in patients with Crohn’s disease and psoriasis [292, 1203, 1454, 1721]. Interestingly, in experimental diabetes and in certain other inflammatory diseases, TNF-α appears to have a two-part influence. TNF-α expressed early was required for disease progression. With prolonged exposure, TNF-α suppressed inflammatory and autoimmune responses [315, 642, 1609]. Certain autoimmune diseases were exacerbated in mice lacking TNF and TNFR. The antiinflammatory effects of long term TNF appear to be due to the suppression of T cell growth and cytokine secretion, associated with downregulation of the T cell receptor [668, 730, 870, 1864]. TNF inhibits tumor growth. It does this several ways. In culture, TNF has a direct effect on many tumor cell lines [250, 1921]. The addition of IFN-γ often has a synergistic effect [563, 2174]. In animals, TNF acts systemically to bring about tumor regression [250]. TNF may act directly on the tumor cells, but its most remarkable effect is on tumor’s vascular endothelium [1435]. Vessels break down and clotting occurs, shutting off the tumor’s blood supply. TNF also stimulates the immune system and upregulates surface antigens involved in tumor cell recognition. TNF and IL-2 synergistically increased cytotoxicity in LAK cells [1517], NK cells [1513] and TIL [1118, 2047, 2111]. TNF may be useful as an adjuvant in tumor vaccines. In animal models, tumor cells engineered to produce TNF induced immune response [30, 162, 775]. The engineered cells were not as tumorigenic; animals with regressed tumors were immune to subsequent tumor challenge. Further, TNF-α has been used to produce dendritic cells for immunization. Dendritic cells prepared from bone marrow were grown in culture with

215 GM-CSF and TNF-α and then pulsed with specific tumor antigens prior to inoculating mice [262, 1259]. TNF-α generally inhibits tumor growth, however, there are cases in which it stimulates growth. TNF appears to be an autocrine and paracrine growth factor for certain ovarian cancers. TNF-α induced its own production. IL-1 also stimulated TNF-α levels and ovarian cancer growth [2207]. In the B16 mouse melanoma model, TNF-α stimulated tumor metastasis to lung. The induction of VCAM-1 by TNF-α may have been responsible [1486]. TNF-α causes thrombocytopenia. Studies in mice showed this depended on TNFRI. Since platelets did not have the TNFR, TNF-α appeared to be stimulating platelet activation and consumption indirectly, possibly by increasing thrombin, plasmin or 5-hydroxytryptamine which are platelet agonists [1941]. Clinical studies with tumor necrosis factor in cancer patients have been extensive. Unfortunately, the results are disappointing. TNF-α has many functions, perhaps too many to be useful clinically. At effective doses, TNF-α causes substantial multiorgan toxicity, hypotension and flu-like symptoms [1318]. As a single agent, it has not shown much antitumor effect [220, 522, 1836, 2149]. By administering TNF-α in isolated limb perfusion [559, 1128, 1496], in organ perfusion [25] and intravesicularly (bladder cancer) [1786], higher doses may be used while containing the toxicity. In these settings, TNF-α has been given in combination with INFγ and chemotherapy (e.g. melphalan). This largely avoids the systemic toxicities. More substantial effects have been observed. Unfortunately, TNF-α administered intrapleurally and intraperitoneally have not been very useful in the control of malignant effusions [771, 1877]. Current strategies with TNF-α emphasize in vitro use to produce dendritic cells and TNF gene transfected tumor cells for vaccines. The TNF gene is also being inserted into activated lymphocytes to exploit the capacity for tumor-specific T cells to home into the target site where TNF is released locally. Recombinant soluble TNF receptor and antibodies to TNF are being tested for control of TNF-related toxicities during immunotherapy. In one study, soluble receptor was administered in combination with IL-2. IL-2-related toxicity (due to TNF release) was modulated while the IL-2 antitumor response was preserved [2020]. Thalidomide, the infamous sedative and teratogen [1291], is once again being prescribed as an immunomodulatory agent and it is being tested in cancer patients. Thalidomide suppresses TNF-α production, inflammation and certain cell surface adhesion molecules [1356, 1462, 1719]. It is also antiangiogenic [953].

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TRAIL Apoptosis in Neoplastic Cells; Regulation of Inflammation Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL, also called apo-2 ligand) is a 281 amino acid transmembrane protein and a member of the tumor necrosis factor family [1576, 2166]. Most leukocytes and certain tumor cells express TRAIL [2166]. In T cells, TRAIL is induced by activation and by IFN-α/β [939, 1776]. Cyclosporin and glucocorticoids inhibit its expression [1406, 2107]. There are at least five receptors for TRAIL; TRAIL-R1 (DR4) [1528], TRAIL-R2 (DR5) [1555, 1751, 1772, 2089], TRAIL-R3 (DcR1) [404, 1341, 1805], TRAIL-R4 (DcR2) [403, 1232, 1527] and osteoprotegerin [490]. TRAIL receptors are found on many cells, often together with TRAIL. TRAIL-R1 and TRAIL-R2 contain cytoplasmic death domains and induce apoptosis in cells, mainly neoplastic cells. TRAIL may induce apoptosis or regulate cell growth in normal T cells, mast cells and hepatocytes [138, 401, 888, 896, 1856]. By comparison with TNF-α and FasL, TRAIL has little normal tissue toxicity [81, 19]. Two possible explanations for this lack of toxicity are competitive antagonism and induction of antiapoptotic proteins. TRAIL-R3 and TRAIL-R4 bind TRAIL but do not induce apoptosis. They lack cytoplasmic death domains and thus serve as decoy receptors [80, 1227, 1555]. In a similar way, osteoprotegerin is a soluble receptor that binds TRAIL and competitively antagonizes its apoptotic activity [490]. Cancer cells may produce OPG and for these tumors OPG can function as a paracrine survival factor [785, 1809]. Normal cells and TRAIL-resistant tumor cells generally express antiapoptotic proteins such as FLIP [671, 856, 2283] and IAP [403, 404, 420, 560, 2100]. These interfere with caspase activation and function as survival factors. Drugs that control survival factors potentiate anticancer effects of TRAIL [1140]. TRAIL is responsible for cell contact-induced tumoricidal activities of CD4 T cells [1985], NK cells [939], monocytes [672] and dendritic cells [289, 510]. In CD4 cells, for example, studies using blocking and activating antibodies showed that TRAIL-induced apoptosis is one of the ways cytotoxic CD4 T cells kill melanoma [1985]. The upregulation of TRAIL on T cells may be responsible for certain antitumor effects of interferons α and β [939]. Dendritic cells can kill tumor cells directly by TRAIL-induced apoptosis. In addition to decreased tumor burden, DC-TRAIL provides apoptotic bodies

Cytokines that stimulate dendritic cell maturation [1689] and serve as antigen for immune response [20, 779]. TRAIL regulates inflammation and autoimmune disease. This has been studied in mouse models for autoimmune arthritis [1856] and encephalomyelitis [757]. Blockade using soluble receptor to TRAIL exacerbated these diseases while TRAIL expression diminished them. TRAIL apparently decreases the activation of autoimmune T cells. The anticancer effects of TRAIL are remarkable but complex. Mice with genetic TRAIL deficiencies had increased risk for hematological malignancies [2276] and methylcholanthrene-induced sarcomas [352]. TRAILinduces apoptosis in most melanoma cell lines [1985, 2283]. In human colon and breast cancers growing in nude mice, activation of TRAIL receptors induced apoptosis and inhibited growth [81, 319, 2090, 2106]. These studies show that TRAIL and TRAIL R1 and R2 may have therapeutic potential in the treatment of cancer. But not all cancers respond. And in certain tumors TRAIL induces NF-κB, which promotes survival and growth [480]. Drugs that inhibited NF-κB signaling sensitized cells to apoptosis and increased anticancer response to TRAIL [104, 1140, 1172, 2098]. Clinical trials have been initiated in cancer patients using apoptosis-inducing TRAIL receptor antibodies [1580, 2001].

TWEAK Cell Growth, Survival; Angiogenesis; Inflammation TWEAK (tumor necrosis factor-like weak inducer of apoptosis) is a member of the TNF cytokine family. It is expressed in many types of cells. Tweak is synthesized as a membrane-bound protein that is cleaved to release a soluble, active, trimeric cytokine [304]. The TWEAK receptor is Fn14. It is a TNF receptor family member. Fn14 was discovered as a cell surface protein that was induced by fibroblast growth factor [523, 2164]. Fn14 is upregulated in injured blood vessels [2164] and in regenerating liver [523]. The cytoplasmic tail binds and signals through TNF associated factors-1, 2, 3 and 5 [206, 2164]. TWEAK activates NFκB, which translocates to the nucleus to induce genes; TWEAK activates caspases 3 and 8 in those cells that undergo Tweakinduced apoptotic death [206, 2019]. In a cultured monocyte line, TWEAK induced the cells to differentiate into osteoclasts. Fn14 was not the receptor for this differentiation since the cell line lacks

Walter M. Lewko and Robert K. Oldham Fn14 and inactivating mabs to Fn14 did not block the Tweak effect. This study suggested the existence of a second TWEAK receptor [1583]. It was recently reported that CD163 is an additional binding protein for TWEAK. It is present on monocytes and macrophages where it is known to function as a scavenger for hemoglobin. CD163 has been shown to compete with Fn14 for TWEAK; may serve as an alternative receptor [185]. TWEAK is a remarkably proinflammatory cytokine. It induces the expression of factors such as IL-6, IL-8, RANTES, MCP-1, IP-10 and ICAM-1 in a number of cell types including fibroblasts [305], keratinocytes [891], synoviocytes [305], bronchial epithelial cells [2216], macrophages [967], mesangial cells [237], astrocytes [1702] and endothelial cells [713]. Typically, the addition of IFN-γ has a synergistic effect. TWEAK levels are elevated in tissues of mice with experimental autoimmune encephalitis [417] and collagen-induced arthritis [1556]. TWEAK is angiogenic. It induces mitosis and migration in human endothelial and aortic smooth muscle cells. FGF-2 and VEGF, which are also angiogenic, stimulate TWEAK receptor levels. TWEAK induced strong vessel growth in the rat cornea angiogenesis assay [449, 713, 1180, 2164]. TWEAK appears to be involved in neoplastic progression. The Fn14 gene is rapidly induced during liver regeneration; Fn14 is overexpressed in hepatocellular carcinomas [523]. When human embryonic kidney cells were transfected to express TWEAK, these cells formed larger and more vascular tumors in nude mice [774]. Glioblastoma specimens and glioma cells in culture overexpress Fn14. And when glioma cells were treated with TWEAK, the cells became resistant to apoptosisbased therapy. Tweak activates the NFκB path for growth and survival. All told, blocking Fn14 may be of benefit in the management of glioblastoma and other TWEAK/Fn14 expressing cancers [2018].

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