Fecundability in Relation to Body Mass and Menstrual Cycle Patterns
1999; Lippincott Williams & Wilkins; Volume: 10; Issue: 4 Linguagem: Inglês
10.1097/00001648-199907000-00014
ISSN1531-5487
AutoresTina Kold Jensen, Thomas Scheike, Niels Keiding, Inger Schaumburg, Philippe Grandjean,
Tópico(s)Pregnancy and preeclampsia studies
ResumoWe examined the association between birth characteristics of offspring and the subsequent maternal risk of breast cancer in a population-based cohort of 998,499 women, 13 to 48 years of age at entry. There were 9,495 incident cases of breast cancer during 12.8 million person-years of follow-up among these women. Compared with mothers of singleton infants, mothers having a multiple birth had an increased risk of breast cancer in the first 5 years after a birth (relative risk (RR) = 1.8; 95% confidence interval (CI) = 1.1-2.8). The risk for mothers having a heavy-weighted child (>3.75 kg), as compared with a child of light weight (< or =3 kg), was also slightly increased (RR = 1.2; 95% CI = 0.9-1.5). This latter effect was primarily due to an increased incidence of tumors larger than 2 cm at diagnosis (RR = 1.4; 95% CI = 0.9-1.9). Our findings are compatible with the hypothesis that the hormonal level during pregnancy influences the risk of breast cancer in the early years after delivery.
Referência(s)