Steroid Hormones and Risk of Breast Cancer Barbara S. Hulka, M.D., M.P.H.,* Edison T. Liu, M.D.,t and Ruth A. Lininger, M.D., M.P.H.$ Background. More than three decades of epidemiologic studies have identified numerous risk factors for breast cancer. These factors have been estimated to account for only 20-25% of disease occurrence. However, among these factors, several are related to sex steroid hormones: sex of the affected individuals [women), early age of menarche and late age of menopause…
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