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pubmed:abstractText |
In uncomplicated pregnancies, first trimester androgen, oestrogen and prolactin concentrations were higher in nulliparous (n=160) than parous (n=260) mothers. Androgens and estrogens were higher in younger than older mothers. These data are consistent with elevated hormone concentrations mediating the breast cancer protection from a first pregnancy and pregnancies occurring at younger ages.
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pubmed:affiliation |
Epidemiology and Biostatistics Program, Division of Cancer Epidemiology and Genetics, 6120 Executive Boulevard, Rockville, MD 20892-7246, USA. troisir@mail.nih.gov
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