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Title: Maternal, prenatal and perinatal characteristics and first trimester maternal serum hormone concentrations.
Authors: Troisi R,  Hoover RN,  Thadhani R,  Hsieh CC,  Sluss P,  Ballard-Barbash R,  Potischman N
Journal: Br J Cancer
Date: 2008 Oct 7
Branches: EBP
PubMed ID: 18766187
PMC ID: PMC2567091
Abstract: 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.