The role of reproductive and menstrual factors in cancer of the breast before and after menopause

R. Talamini, S. Franceschi, C. La Vecchia, E. Negri, L. Borsa, M. Montella, F. Falcini, E. Conti, C. Rossi

Research output: Contribution to journalArticle

Abstract

The aim of the study was to elucidate the role of reproductive and menstrual factors in the aetiology of breast cancer, overall and by menopausal status. A cooperative case-control study was conducted between 1991 and 1994 in six different Italian areas (including three from the centre and the south). The study included 2569 histologically confirmed incident cases of breast cancer (median age 55 years, range 23-78 years) and 2588 control women (median age 56 years, range 20-79 years) admitted to the same hospitals for a variety of acute conditions unrelated to the hypotheses in study. A trend of increasing risk with increasing age at menopause (odds ratio (OR) for age at menopause ≥ 53 versus <45 years = 1.8; 95% confidence interval (CI) = 1.4-2.2). High parity reduced cancer risk (OR for ≥ 4 versus 1 birth = 0.7; 95% CI = 0.5-0.9). Overall, nulliparous women showed a 20% lower risk than uniparous ones (OR = 0.8; 95% CI = 0.7-1.0). Late age at first birth (or pregnancy) had an independent adverse effect (OR for first birth at ≥ 32 versus

Original languageEnglish
Pages (from-to)303-310
Number of pages8
JournalEuropean Journal of Cancer
Volume32
Issue number2
DOIs
Publication statusPublished - Feb 1996

Keywords

  • Age at diagnosis
  • Breast cancer
  • Menstrual factors
  • Reproductive factors

ASJC Scopus subject areas

  • Cancer Research
  • Hematology
  • Oncology

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