© 2001 by Oxford University Press
Journal of the National Cancer Institute, Vol. 93, No. 1, 60-62,
January 3, 2001
© 2001 Oxford University Press
BRIEF COMMUNICATION |
In Utero Exposures and Breast Cancer: a Study of Opposite-Sexed Twins
Affiliation of authors: Department of Medical Epidemiology, Karolinska Institutet, Stockholm, Sweden.
Correspondence to: Magnus Kaijser, M.D., Berzelius väg 15C, S-171 77 Stockholm, Sweden (e-mail: magnus.kaijser@mep.ki.se).
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.
One possible reason for the divergent results could be the narrow range of antenatal estrogen exposure seen in singleton pregnancies. Twin
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