In Utero Exposures and Breast Cancer: a Study of Opposite-Sexed Twins

Abstract
It has been suggested that hormonal exposures in utero influence the risk of breast cancer later in life (1). Estrogens are well-established risk factors for breast cancer (2), and there is a pronounced association between birthweight and antenatal estrogen exposure (3). Several epidemiologic studies (46) have found that preeclampsia, a perinatal event characterized by low maternal estrogen levels, is associated with a decreased risk of breast cancer, but the results in different studies (68) of the association between birthweight and breast cancer risk are not entirely consistent.

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