title: Maternal, prenatal and perinatal characteristics and first trimester maternal serum hormone concentrations.
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.
authors.affiliation: Epidemiology and Biostatistics Program, Division of Cancer Epidemiology and Genetics, 6120 Executive Boulevard, Rockville, MD 20892-7246, USA. troisir@mail.nih.gov
authors.forename: R
authors.initials: R
authors.lastname: Troisi
authors.forename: R N
authors.initials: RN
authors.lastname: Hoover
authors.forename: R
authors.initials: R
authors.lastname: Thadhani
authors.forename: C-C
authors.initials: CC
authors.lastname: Hsieh
authors.forename: P
authors.initials: P
authors.lastname: Sluss
authors.forename: R
authors.initials: R
authors.lastname: Ballard-Barbash
authors.forename: N
authors.initials: N
authors.lastname: Potischman