I Oncogenes/Growth Factors-Their Role in Breast Cancer.- 1. An Analysis of Three Proto-Oncogenes in Primary Human Breast Tumor DNAs: The c-mos, the C-erbB-2 and the Epidermal Growth Factor Receptor Genes.- 2. Proviral Activation of Potential Oncogenes in Tumors Induced by Mouse Mammary Tumor Virus.- 3. Quantitative and Qualitative Changes in Oncogene Expression During Carcinogenesis.- 4. Mammary Tumor-Associated Growth Factors: Origins and Possible Functions.- 5. The Oestrogen-Induced pS2 Gene and the Oestrogen Receptor in Breast Cancer.- 6. Workshop on Oncogenes and Chemical Effectors of Neoplastic Transformation.- II Mammary Gland Development, Differentiation and Pathology in Relationship to Malignancy.- 7. Immunological Markers in the Study of the Development of the Mouse Mammary Gland and Its Tumors.- 8. Cloning the Polymorphic Gene for the Mammary Mucin Abnormally Glycosylated in Carcinomas.- 9. Regulation of Tissue-Specific Gene Expression in the Mammary Gland: The Role of the Extracellular Matrix.- 10. The Possible Role of Abnormal Fibroblasts in the Pathogenesis of Breast Cancer.- 11. Myoepithelial and Endocrine Differentiation in Breast Carcinoma.- 12. Human Monoclonal Antibodies Directed Against Viral Antigens.- 13. Cytotoxic Effector Mechanisms Involved in the Immunity Against Mammary Tumors.- 14. Mesenchymal-Epithelial Interactions in Normal and Malignant Mammary Cells.- 15. Breast Cancer Differentiation and Progression: Analysis with Monoclonal Antibodies and Flow Cytometry.- III New Developments in Clinical Applications.- 16. Mammary Epithelial Antigens as a Breakthrough in Breast Cancer Research: Now Where to?.- 17. CA15-3 and Related Antigens as Serum Markers for Monitoring Breast Cancer.- 18. Nuclear DNA Content and Prognosis in Breast Cancer.- 19.Perspectives for the Clinical Use of Aromatase Inhibitors.- 20. Monoclonal Antibodies for Improved Evaluation of Breast Cancer Prognosis.- 21. Hormone Receptors and Interactions Workshop Summary.- IV New Perspectives in the Prevention and Control of Breast Cancer.- 22. The Role of Diet in the Etiology and Causation of Breast Cancer.- 23. Is Primary Prevention of Breast Cancer Achievable?.- 24. Large Scale Screening Programs in Breast Cancer Prevention.- 25. Successful Research Findings: What Comes Next?.