1. Develop the means to reduce the effectiveness of external agents for producing cancer.--2. Develop the means to modify individuals in order to minimize the risk of cancer development.--3. Develop the means to prevent transformation of normal cells to cells capable of forming cancers.--4. Develop the means to prevent progression of precancerous cells to cancers, the development of cancers from precancerous conditions, and spread of cancers from primary sites.--5. Develop the means to achieve an accurate assessment of (a) the risk of developing cancers in individuals and in population groups, and (b) the presence, extent and probable course of existing cancers.--6. Develop the means to cure cancer patients and to maintain control of cancer in patients who are not cured. 2v.--7. Develop the means to improve the rehabilitation of cancer patients.--[8]. Summary report for cancer control.--[9]. Summary report of the chairman