Abstract
The purpose of the study was to estimate the number of new breast cancer cases in France in 2015 attributable to breastfeeding for durations below recommendations (at least 6months per child), and cases prevented through historical breastfeeding. As a secondary analysis, the corresponding numbers for ovarian cancer were estimated. Historical breastfeeding data were obtained from population surveys. Duration of breastfeeding data were obtained from the French Épifane cohort study. Relative risks were obtained from meta-analyses, cohort, and case-control studies. Cancer incidence data were obtained from the French Network of Cancer Registries. A 10-year latency period was assumed. Among parous women 25years of age and older, 14.1% breastfed for at least 6months per child born before 2006. As a result, 1,712 new breast cancer cases (3.2% of all new breast cancer cases) were attributable to breastfeeding for < 6months per child, while actual breastfeeding practices prevented 765 breast cancer cases. Furthermore, 411 new ovarian cancer cases (8.6% of all new ovarian cancer cases) may be attributable to breastfeeding for < 6months per child, with breastfeeding preventing 163 ovarian cancer cases. The historically low breastfeeding prevalence and duration in France led to numerous avoidable cancer cases.
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