Women carrying a mutated BRCA1 or BRCA2 gene have roughly an 80% risk of developing breast cancer. A mutation in these genes also leads to an increased risk of developing ovarian tumors.
携带变异的BRCA1或BRCA2基因的妇女患上乳腺癌的几率约有80%。这些基因内的变异也导致了卵巢肿瘤的发生。