Breast cancer is the most common form of cancer among women in Germany: Around 1 in 8 women will develop it during their lifetime. In around 5% to 10% of cases, the condition is caused by a hereditary predisposition. Thirteen risk genes have currently been identified for genetic testing, including the BRCA1 and BRCA2 genes. Variations (mutations) in these genes are associated with a significantly increased risk of breast cancer.
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