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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…
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