The focus of the 22nd Annual Detroit Cancer Symposium was the presentation and discussion of cytotoxic agents, with a significant portion of the symposium including the exciting frontiers of drug discovery being explored by the National Cooperative Drug Discovery Groups (NCDDG) Program. The symposium brought together a large number of investigators from government, universities and pharmaceutical companies involved in the discovery and development of new anticancer agents. Exciting new leads were presented and the status of others presently under development was discussed. Of particular significance has been the initiation of renewed efforts in the area of natural product drug discovery, where the discovery of new cytotoxics is very promising at the moment. A number of major changes have occurred during the last decade in research on drug discovery of cytotoxic agents. Critical reviews of a number of the models and concepts underlying drug discovery represented a continuous thread throughout the meeting, being constantly discussed in terms of their advantages, disadvantages and capabilities of discovering solid tumor active anticancer agents. A recent development which is to be much applauded and which portends to great discoveries is the new relationship formed between Government, University of Industry. The NCDDG mechanism which stimulates this interaction is an inexpensive manner to greatly magnify the drug discovery and development effort nationally. Cytotoxic Anticancer Drugs: Models and Concepts for Drug Discovery and Development represents a forum which will become the major mode for bringing together these three different components in the equation to regularly discuss new results and ideas.

This unique volume traces the critically important pathway by which a "molecule" becomes an "anticancer agent. " The recognition following World War I that the administration of toxic chemicals such as nitrogen mustards in a controlled manner could shrink malignant tumor masses for relatively substantial periods of time gave great impetus to the search for molecules that would be lethal to specific cancer cells. Weare still actively engaged in that search today. The question is how to discover these "anticancer" molecules. Anticancer Drug Development Guide: Preclinical Screening, Clinical Trials, and Approval, Second Edition describes the evolution to the present of preclinical screening methods. The National Cancer Institute's high-throughput, in vitro disease-specific screen with 60 or more human tumor cell lines is used to search for molecules with novel mechanisms of action or activity against specific phenotypes. The Human Tumor Colony-Forming Assay (HTCA) uses fresh tumor biopsies as sources of cells that more nearly resemble the human disease. There is no doubt that the greatest successes of traditional chemotherapy have been in the leukemias and lymphomas. Since the earliest widely used in vivo drug screening models were the murine L 1210 and P388 leukemias, the community came to assume that these murine tumor models were appropriate to the discovery of "antileukemia" agents, but that other tumor models would be needed to discover drugs active against solid tumors.

Leading investigators synthesize the entire laboratory and clinical process of developing anticancer drugs to create a single indispensable reference that covers all the steps from the identification of cancer-specific targets to phase III clinical trials. These expert authors provide their best guidance on a wide variety of issues, including clinical trial design, preclinical screening, and the development and validation of bioanalytic methods. The chapters on identifying agents to test in phase III trials and on trial design for the approval of new anticancer agents offer a unique roadmap for moving an agent to NDA submission.

With the publication of these proceedings from the Second Drug Discovery and Development Symposium, this forum has become the main mechanism for bringing together the principal groups involved in both discovering and developing new approaches to the treatment of cancer. This Second Symposium emphasized the types of materials being discovered and their therapeutic activity. This is especially evident in the natural product discovery programs, where unique and active structures are being identified. The major contributors to the meeting were the investigators participating in the National Cooperative (Natural Products) Drug Discovery Groups [NC(NP)DDG]. These groups reflect an association among researchers at universities or cancer centers, pharmaceutical companies and the National Cancer Institute. Their sources of materials are varied, reflecting chemical inventories of pharmaceutical companies, organic synthetic compounds from the laboratory, cytotoxics as well as biologics and their hybrids, and natural products obtained from plants, marine organisms and microorganisms. The models employed in the discovery systems vary from broadly cellular based to specific enzymes to defined cellular functions. Each of them is believed important to the malignant state and will allow for the discovery of compounds which will have efficacy in cancer therapy. The goal of the participants is both to discover new anticancer agents and to develop them as efficiently as possible into clinically useful additions to treatment. Of importance is the fact that there are a number of promising leads which will soon be moving into the clinic thereby testing the effectiveness of this NC (NP) DDG approach.

The past decades have seen major developments in the understanding of the cellular and molecular biology of cancer. Significant progress has been achieved regarding long-term survival for the patients of many cancers with the use of tamoxifen for treatment of breast cancer, treatment of chronic myeloid leukaemia with imatinib, and the success of biological drugs. The transition from cytotoxic chemotherapy to targeted cancer drug discovery and development has resulted in an increasing selection of tools available to oncologists. In this Special Issue of Pharmaceuticals, we highlight the opportunities and challenges in the discovery and design of innovative cancer therapies, novel small-molecule cancer drugs and antibody–drug conjugates, with articles covering a variety of anticancer therapies and potential relevant disease states and applications. Significant efforts are being made to develop and improve cancer treatments and to translate basic research findings into clinical use, resulting in improvements in survival rates and quality of life for cancer patients. We demonstrate the possibilities and scope for future research in these areas and also highlight the challenges faced by scientists in the area of anticancer drug development leading to improved targeted treatments and better survival rates for cancer patients.

Experienced cancer researchers from pharmaceutical companies, government laboratories, and academia comprehensively review and describe the arduous process of cancer drug discovery and approval. They focus on using preclinical in vivo and in vitro methods to identify molecules of interest, detailing the targets and criteria for success in each type of testing and defining the value of the information obtained from the various tests. They also define each stage of clinical testing, explain the criteria for success, and outline the requirements for FDA approval. A companion volume by the same editor (Cancer Therapeutics: Experimental and Clinical Agents) reviews existing anticancer drugs and potential anticancer therapies. These two volumes in the Cancer Drug Discovery and Development series reveal how and why molecules become anticancer drugs and thus offer a blueprint for the present and the future of the field.

Animal Models in Cancer Drug Discovery brings forward the most cutting-edge developments in tumor model systems for translational cancer research. The reader can find under this one volume virtually all types of existing and emerging tumor models in use by the research community. This book provides a deeper insight on how these newer models could de-risk modern drug discovery. Areas covered include up to date information on latest organoid derived models and newer genetic models. Additionally, the book discusses humanized animal tumor models for cancer immunotherapy and how they leverage personalized therapies. The chapter on larger animal, canine models and their use in and their use in pre-investigational new drug (pre-IND) development makes the volume unique. Unlike before, the incorporation of several simplified protocols, breeding methodologies, handling and assessment procedures to study drug intervention makes this book a must read. Animal Models in Cancer Drug Discovery is a valuable resource for basic and translational cancer researchers, drug discovery researchers, contract research organizations, and knowledge seekers at all levels in the biomedical field. - Encompasses discussions on innovative animal models, xenograft, genetic models, primary models, organoid systems, humanized and other models in modern biology paradigms that are enhancing research in the field of drug discover - Covers the use of these models in personalized medicine, immunotherapy, toxicology, pre-IND assessments and related drug development arenas - Presents protocols, procedures, and a comprehensive glossary to help new readers understand technical terms and specialized nomenclature