Risk factors for breast cancer in women under 40 years

A. Tavani, S. Gallus, C. La Vecchia, E. Negri, M. Montella, L. Dal Maso, S. Franceschi

Research output: Contribution to journalArticlepeer-review


The relation between hormonal and lifestyle factors and breast cancer risk in women younger than 40 years was investigated using data from two case-control studies conducted in Italy between 1983 and 1994. Cases were 579 women with histologically confirmed, incident breast cancer and controls were 668 women admitted to hospital for acute, non-neoplastic, non-hormone-related diseases. Breast cancer risk was inversely related to age at menarche with a multivariate odds ratio (OR) of 0.53 (95% confidence interval, CI, 0.31-0.89) for women reporting menarche at the age of ≥15 years compared with 2 compared to

Original languageEnglish
Pages (from-to)1361-1367
Number of pages7
JournalEuropean Journal of Cancer
Issue number9
Publication statusPublished - Sep 1999


  • Breast neoplasms
  • Case-control studies
  • Diet
  • Hormonal factors
  • Oral contraceptives
  • Reproductive factors
  • Risk factors

ASJC Scopus subject areas

  • Cancer Research
  • Hematology
  • Oncology


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