A positive BRCA2 result gives a woman a 50 % to 70 % lifetime risk of breast cancer and a 10 % to 20 % lifetime risk of ovarian cancer . Everyone has normal and BRCA2 genes ; a mutation can show increased cancer risk . Not everyone needs to be tested for the same mutation . Genetic counselors and other providers can help decide whether to test and when .
Everyone has normal and BRCA2 genes ; a mutation can show increased cancer risk . Not everyone needs to be tested for the same mutation . Genetic counselors and other providers can help decide whether to test and when .