Opening Remarks, Chairman of Cancer Control Commission of UICC.- Opening Remarks, Chairman of Cancer Prevention Committee.- Pr?sentation de lOrdre du Jour, avec Commentaires, Chairman of the Symposium.- Considerations G?n?rales sur les Risques de Canc?risation Pouvant Resulter de lEmploi de Certains Agents Chimiques en Th?rapeutique.- Discussion.- Principles of Methodology Relating to the Potential Carcinogenicity of Medical Drugs.- Discussion.- Some Aspects of Medical Drug Testing for Carcinogenic Activity.- Discussion.- A Program for the Investigation of the Possible Chronic Hazards of Drugs.- Discussion.- Statistical Approach to the Evaluation and Prediction of Possible Carcinogenic Action of Drugs.- Discussion.- Quantitative Aspects in Chemical Carcinogenesis.- Discussion.- Carcinogenic Hazards from Arsenic and Metal Containing Drugs.- On Potential Carcinogenicity of the Iron Macromolecular Complexes.- Discussion.- Risques canc?rog?nes des Traceurs radioactifs utilis?s pour le Diagnostic.- Evaluation of Possible Carcinogenicity of Petroleum Products in Therapeutic Use.- Discussion.- A Propos de lActivit? oncog?ne de quelques hydrocarbures halog?n?s utilis?s en Th?rapeutique.- Discussion.- Drugs with Lactone Groups as Potential Carcinogens.- Discussion.- Pyrrolizidine (Senecio) Alkaloids and other Natural Drugs as Potential Carcinogens.- Discussion.- Progesterone and Mammary Carcinogenesis.- Discussion.- On Blastomogenic Effect of Antithyroid Drugs.- Discussion.- On Potential Carcinogenicity of Some Hydrazine Derivatives Used as Drugs.- Plastics Carcinogenesis, Some Experimental Data and Its Possible Importance for Clinic and Prophylaxis of Cancer.- Plastic Carcinogenesis; Suggestions for the Use of Plastics in Surgery, Orthopedics.- Discussion.- Biochemical Aspects of Carcinogenesis with Special Reference to Alkylating Agents and Some Antibiotics.- Discussion.- Metabolism of Drugs in Relation to Carcinogenicity.- The Point of View of the Pharmacologist.- DisclC&