The biology of solid tumor metastasis has been the subject of significant scientific and clinical interest for years and while experimental evidence reveals that metastasis is not solely a random event, very little is known about the biology of metastasis originating from prostate cancer. This is in spite of the fact that the majority of prostate cancer patients die with metastatic lesions to the bone. Progress in understanding this most important aspect of prostate cancer has been hampered by the lack of suitable animal models and an inability to accurately quantify bone metastases and their responses to therapy. Over the past decade, scientists in Japan and the United States have steadily advanced our understanding of the cellular, molecular and immunologic biology of primary and disseminated prostate cancer. It is this body of new information, combined with advances in imaging techniques and prostate cancer tumor markers, that prompted the need for an in-depth assessment of bone metastasis of prostate cancer. Accordingly, on December 12, 1990, a group of basic and clinical investigators from Japan and the United States convened in Gotenba, Japan, to hold the first conference devoted solely to the basic biology and clinical aspects of bone metastases originating from prostate cancer. The cross-fertilization of ideas that was fostered through in-depth discussion of technological advances among various basic and clinical disciplines not only further advanced our understanding of prostate metastases to the bone, but suggested approaches for precise quantitative assessment of these lesions and their treatment.

These proceedings of the 5th Prouts Neck Meeting on Prostate Cancer, held in October, 1989, highlight the many advances in the understanding of prostatic growth and function at the cellular and molecular levels which have been registered since the first Prouts Neck Meeting in 1985, a meeting which also focused on the then current concepts and basic approaches to understanding prostate cancer. Inter vening Prouts Neck Meetings in 1986, 1987 and 1988 were devoted to treatment, image cytometry and clinical markers. As before, the Prouts Neck tradition of bringing together an international, multidiscipli nary group of experts for 3 days to exchange ideas and new data, in the relaxed atmosphere of an old iun on the scenic Maine coast, proved to be an ideal combination for a highly successful conference. Accordingly, the Organ System Program of the National Cancer Institute plans to use the Prouts Neck model for future conferences on other solid tumors (bladder in 1990 and kidney in 1991) and will return to the prostate in 1992. A new dimension was added to the current program through the inclusion of a poster session to recognize the research of pre-and postdoctoral investigators. The posters were judged by Drs. Collette Freeman, Frank French, Shutsung Liao, Robert Matusik and Henry Sun. The three winners, in alphabeti cal order, were John Fabian, Robert Getzenberg and Ming Fong-Lin."

I. Prostatic Cancer Bone Metastasis: An International Perspective.- Clinical Dilemmas and Problems in Assessing Prostatic Metastasis to Bone: The Scientific Challenge.- Comparative Study of Prostatic Carcinoma Bone Metastasis among Japanese in Japan and Japanese Americans and Whites in Hawaii.- Prostate Cancer in the United States and Japan.- Analysis of Survival of Prostate Cancer Patients in Japan and the USA.- II. Biology.- The Cellular Basis for Prostate Cancer Metastasis.- Cytogenetic and Molecular Genetic Aspects of Human Prostate Cancer: Primary and Metastatic.- Hemodynamics of Prostate Bone Metastases.- Role of the Vertebral Venous System in Metastatic Spread of Cancer Cells to the Bone.- Clinical Significance of the Vertebral Vein in Prostate Cancer Metastasis.- Effects of Various Growth Factors on a Chondrocyte Differentiation Model.- Potential Role of HBGF (FGF) and TGF-Beta on Prostate Growth.- Hormone Refractory Prostatic Cancer: The Role of Radiolabelled Diphosphonates and Growth Factor Inhibitors.- III. Models.- Localization of Basic Fibroblast Growth Factor (bFGF) in a Metastatic Cell Line (AT-3) Established from the Dunning Prostatic Carcinoma of Rat: Application of a Specific Monoclonal Antibody.- Use of a Reconstituted Basement Membrane to Study the Invasiveness of Tumor Cells.- Animal Prostate Carcinoma Models: Limited Potential for Vertebral Metastasis.- A Model for Studies on Human Prostatic Carcinoma.- IV. Pathology.- Studies on the Pathogenesis of Osteoblastic Metastases by Prostate Cancer.- Analysis of Bone Metastasis of Prostatic Adenocarcinoma in 137 Autopsy Cases.- Nucleolar Organizer Regions in Prostate Cancer.- Flow Cytometric Analysis of Prostatic Carcinoma with and without Bone Marrow Metastasis.- V. Evaluation.- Evaluation of the Response of Bone Metastases to Therapy.- Computed Tomographic Evaluation of Bone Metastases in Prostatic Cancer Patients.- Magnetic Resonance Imaging of Bone Metastases.- Bone Marrow MRI in Prostate Cancer.- Bone Mineral Density for Patients with Bone Metastasis of Prostate Cancer: A Preliminary Report.- Quantification of Changes in Bone Scans of Patients with Osseous Metastases of Prostatic Carcinoma.- The Usefulness of Serum Acid Phosphatase in Monitoring Patients with Advanced Prostate Carcinoma.- VI. Treatment.- Radiation Treatment of Prostate Bone Metastases and the Biological Considerations.- Clinical Course of Bone Metastasis from Prostatic Cancer Following Endocrine Therapy: Examination with Bone X-Ray.- Palliative Radiotherapy of Bone Metastasis.- Clinical Study of Bone-Related Relapse in Prostate Carcinoma.- Surgical Treatment of Metastatic Tumors of Long Bones and the Spine.- Hormone Therapy of Prostatic Bone Metastases.

I. Intracellular Communications.- Tissue Specificity and Cell Death are Associated with Specific Alterations in Nuclear Matrix Proteins.- Mechanism of Growth Regulation in Androgen Responsive Cells.- The Impact of Androgen, Extracellular Matrix, and Stroma upon Proliferation and Differentiation of Benign and Malignant Prostate Epithelial Cells.- Therapeutic Approaches to Activating Programmed Cell Death of Androgen-Independent Prostatic Cancer Cells.- Cell Motility and Structural Harmonics in Prostate Cancer.- Panel Discussion.- II. Growth Factors - 1.- Studies of the Endocrine and Paracrine Effect of Tumor Produced Factors in Human Genitourinary Cancers.- Fibroblast Growth Factor: Implications in the Etiology of Benign Prostatic Hyperplasia.- Fibroblast-Mediated Human Epithelial Tumor Growth and Hormonal Responsiveness In Vivo.- Polyamine Requirement of Prostate Cancer Cell Proliferation.- Heparin-Binding (Fibroblast) Growth Factor/Receptor Gene Expression in the Prostate.- Characterization and Partial Purification of a Non - Heparin-Binding Prostate Growth Factor From Cancerous Human Prostate.- Panel Discussion.- Growth Factors - 2.- Transforming Growth Factor a: A Potential Autocrine Growth Regulator in Prostatic Carcinoma.- Prostatic Growth Factors (PrGFs) - From the Identification of Probasin to the Role of PrGFs.- Urogenital Sinus Derived Growth Inhibitory Factor.- Growth Factor Antagonists in Prostate Cancer: Suramin and Cytotoxic Polyamines as Potential Therapy.- Transforming Growth Factors in Human Prostate Cancer.- Gene Products as the Motivating Force in the Prostate Cell's Response to Androgens.- Panel Discussion.- III. Steroid Receptors.- Molecular Biology of Prostate - Specific Antigen.- Structure and Expression of the Androgen Receptor in Normal Tissues and in Prostate Carcinoma Cell Lines.- Structural Analysis and Gene Expression of TR2 Receptor and TR3 Receptor.- cDNA Cloning, Antibody Production and Immunohistochemical Localization of the Androgen Receptor.- New Approaches to Studies on the Androgen Receptor.- Specific Receptors for Vitamin D3 in Human Prostatic Carcinoma Cells.- Panel Discussion.- IV. Poster Presentations.- Role of Androgens and Extracellular Matrix in the Growth and Differentiation of Benign and Malignant Prostatic Epithelial Cells.- Tissue Specificity and Cell Death Are Associated with Specific Alterations in Nuclear Matrix Proteins.- ElTect of Transformation on Rat Prostatic Fibroblasts: Alterations In Extracellular Matrix and Cytoskeleton Gene Expression with Retention of Androgen Responsiveness and Androgen Receptor Expression.- A Potential Role for the MDR-1 Gene in the Development of Androgen-Independent Tumors.- Relevance of Low Androgen Levels and Adrenal Androgens in the Growth of Transplantable Human Prostatic Carcinomas.- Growth-Stimulating Effect of Growth Factor(s) from Androgen Independent Tumor Cells (CS 2-Cell) on Androgen Responsive Tumor Cells.- The Cellular Form of Human Prostatic Acid Phosphatase May Function as a Phosphotyrosyl Protein Phosphatase in Cells.- Expression of Prostate Antigen in LNCaP Cells in Culture.- Allelic Expression of the Mouse Ren-1 Genes in the Anterior Prostate (Coagulating Gland).- V. Dna Structure and Gene Expression.- Genomic Alterations in Prostatic Cancer.- Regulation of Gene Expression in the Prostate.- Androgen Regulation of HBGF I-(aFGF) and Characterization of the Androgen-Receptor mRNA in the Human Prostate Carcinoma Ceil Une - LNCaP/A-dep.- DNA Methylation, Differentiation and Cancer.- Evidence for tbe Involement of Genetic Differences and Mesenchymal Factors in the Progression of Oncogene - Induced Prostate Cancer in Reconstituted Mouse Prostate.- Differential Hybridization Analysis as a Tool to Study Prostatic Cancer Metastasis.- Molecular Biology of Androgen Acceptors in Prostatic Cancer Cells.- Panel Discussion.- Panel Discussion.- Panel Discussion.- Panel Discussion.- Panel Discussion.- Contributors.