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Studies suggest that lifestyle factors and exposure to chemicals that act as "environmental estrogens," including organochlorines used in pesticides and industrial processes, may influence the incidence of breast cancer (see JWWH Nov 1996, p. 64). However, these researchers found no significant increase in plasma levels of DDE, a metabolite of DDT, or polychlorinated biphenyls (PCBs) in 240 women who gave blood samples in 1989 or 1990 and developed breast cancer before June 1992.
Patients and matched controls without breast cancer were participants in the Nurses' Health Study. They did not differ significantly in their risk factors for breast cancer, except that more breast cancer patients had mothers or sisters with breast cancer and a hist…