PubMed · 2012 · 44 citations · 18 references
Majority of risk factors for pre-menopausal breast cancer are also associated with postmenopausal breast cancer except less parity, which increased the risk for post-menopausal breast cancer only.
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Lactation and a Reduced Risk of Premenopausal Breast Cancer
Polly A. Newcomb, Barry E. Storer, Matthew P. Longnecker et al. · New England Journal of Medicine · 1994 · 524 citations · Full text