Annals of internal medicine
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Meta Analysis
Breast Cancer Risk After Recent Childbirth: A Pooled Analysis of 15 Prospective Studies.
Parity is widely recognized as protective for breast cancer, but breast cancer risk may be increased shortly after childbirth. Whether this risk varies with breastfeeding, family history of breast cancer, or specific tumor subtype has rarely been evaluated. ⋯ The Avon Foundation, the National Institute of Environmental Health Sciences, Breast Cancer Now and the UK National Health Service, and the Institute of Cancer Research.