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Antibiotics may Increase Breast Cancer Risk

  • February 17, 2004

Women who took antibiotics for more than 500 days--or had more than 25 prescriptions--over an average period of 17 years had more than twice the risk of breast cancer as women who had not taken any antibiotics. Even women who had between one and 25 prescriptions over an average period of 17 years were about 1.5 times more likely to be diagnosed with breast cancer than women who didn't take any antibiotics. The authors offer a few possible explanations for the observed association between...