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[A review of prevention against cancer of the breast].

Establishment of preventive countermeasures against cancer of the breast is earnestly desired because death from breast cancer has been rapidly increasing. In this paper preventive countermeasures against it was discussed from a point of view of system analysis. Primary prevention (prevention against occurrence of breast cancer) was discussed by multiple regression method and pass analysis. The result showed the today's most effective primary prevention was restriction of fat in food, however there might be more strong unknown risk factors. Secondary prevention (prevention against death from breast cancer) was also discussed with data of breast examination and breast self-examination in Kanagawa Prefecture. The result showed ratios of women who attended breast examination or practiced breast self-examination were not high, the effort to heighten these ratios was important and the most effective preventive countermeasures against breast cancer.