Abstract
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 language | English |
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Pages (from-to) | 1361-1367 |
Number of pages | 7 |
Journal | European Journal of Cancer |
Volume | 35 |
Issue number | 9 |
DOIs | |
Publication status | Published - Sep 1999 |
Keywords
- Breast neoplasms
- Case-control studies
- Diet
- Hormonal factors
- Oral contraceptives
- Reproductive factors
- Risk factors
ASJC Scopus subject areas
- Cancer Research
- Hematology
- Oncology