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Inherited mutations in cancer susceptibility genes make up about 5% to 10% of breast and ovarian cancers. The majority of families with hereditary patterns of breast and/or ovarian cancers have BRCA 1 and BRCA 2 mutations. Offspring and siblings of known mutation carriers have a 50% chance of also having a mutation. Read more about BRCA mutations and the statistics, as well as the red flags you should be aware of to determine if testing should be done, at the following link.