Cancer of the Breast as a Familial Disease

Abstract
Mammary carcinoma is a familial disease. When it appears in a family the succeeding generation of women are not only predisposed to develop it, but they develop it approximately 10 to 12 years earlier. Clinicians should be alert to these possibilities. The fact that the difference in age of onset between mothers and daughters, and aunts and nieces, is similar, is an argument in favor of a genetic rather than a viral mechanism for the transmission of mammary cancer.