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Breast Cancer Causes

Source : http://www.news-medical.net/health/Breast-Cancer-Causes.aspx
The primary risk factors that have been identified are sex, age, childbearing, hormones, a high-fat diet, alcohol intake, obesity, and environmental factors such as tobacco use, radiation
Well established risk factors account for 47% of cases while 5% are attributable to hereditary syndromes. In particular, carriers of the breast cancer susceptibility genes, BRCA1 and BRCA2, are at a 30-40% increased risk for breast and ovarian cancer, depending on in which portion of the protein the mutation occurs.

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