BACKGROUND: Although childbearing is known to protect against breast cancer, whether or not breastfeeding contributes to this protective effect is unclear. METHODS: Individual data from 47 epidemiological studies in 30 countries that included information on breastfeeding patterns and other aspects of childbearing were collected, checked, and analysed centrally, for 50302 women with invasive breast cancer and 96973 controls. Estimates of the relative risk for breast cancer associated with brea...Expand abstract
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Breast cancer and breastfeeding: collaborative reanalysis of individual data from 47 epidemiological studies in 30 countries, including 50302 women with breast cancer and 96973 women without the disease.
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