AAPLOG Statement on Abortion & Risk of Breast Cancer Bibliography (7/02)

There is very strong evidence in the world’s scientific medical literature that induced abortion constitutes a significant risk factor for future breast cancer. Is it a real risk that every woman considering elective abortion should be appraised of? Or is it simply an unproven threat thrown into the abortion arena to frighten pregnant women from making the "the choice"? These are absolutely vital questions for any abortion inclined pregnant woman. The threat of breast cancer, surgery, radiation, chemotherapy, disfigurement, even death, hang on the correct answers. We depend on "evidence based medicine" to guide us to valid conclusions on such issues. Here is the evidence: There are two pregnancy related independent risk factors for breast cancer established in the medical literature. The first is the protective effect of an early first full term pregnancy. The landmark study establishing this protective effect [MacMahon, et al, (1970) Bull WHO 43:209-221] is widely accepted in the medical world. MacMahon, and group reanalyzed their 1970 data [Trichopolous D, Hsieh C, MacMahon B, Lin T, et al,, Age at any Birth and Breast Cancer Risk, International J Cancer, 1983:31:70l-704], finding that each one year delay in the first full term pregnancy increased relative breast cancer risk by 3.5% (compounded). Obviously, aborting a first pregnancy eliminates the protective effect against breast cancer. The second independent risk factor for breast cancer is induced abortion. As of March, 2002, there have been published in the worldwide medical literature 37 studies (including 15 American studies) reporting data on the risk of breast cancer among women with a history of induced abortion. 28 of these studies report increased risk....