Breast Cancer after Exposure to the Atomic Bombings of Hiroshima and Nagasaki

Information on breast cancer among survivors of the atomic bombings has now accumulated to the point where a fairly definite carcinogenic effect seems established. In women exposed to 90 rads or more, breast cancer developed at a rate two to four times the rates observed in the comparison group of the study sample and in the reported rates for Miyagi Prefecture. The onset of breast cancer relatively early in life, before the menopause, distinguished the irradiated from the control group.