Reproductive factors in breast cancer epidemiology.
- Authors
- KvΓ₯le, G
- Year
- 1992
- Journal
- Acta oncologica (Stockholm, Sweden)
- PMID
- 1622633
- DOI
- 10.3109/02841869209088901
There is abundant epidemiologic evidence showing that early menarche, late menopause, low parity and late age at first birth are related to increased risk of breast cancer. However, in younger age groups, uniparous women seem to be at higher risk than nulliparous, and the effect of later pregnancies is less clear in this group. Intervals between pregnancies may modify the general protective effect. Some studies have indicated an adverse effect of late age at pregnancies after the first. Further studies are necessary to determine if the general protective effect of pregnancies after the first is preceded by a transient increase in breast cancer risk. No clear association has been established with number of abortions. Results from two large prospective studies suggest that breast feeding is not strongly related to risk of breast cancer among Western populations.
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External
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