Abstract
The bimodal 5-yr distribution curve of human breast [cancer] observed from Jan., 1970-May, 1976, was partly explained as a result of a 2-peak curve of comedocarcinoma, 2 unimodal early curve of solid and cribriform carcinoma and a late unimodal curve or plateau of papillary carcinoma. The association with the mammary lobules of these tumors is discussed.