Probability of Carrying a BRCA Gene Mutation
1 in 250 (0.4%)
Lifetime probability in US
About 1 in 250 people carry a BRCA1 or BRCA2 mutation, which significantly increases breast and ovarian cancer risk.
Approximately 1 in 250 people in the general population (0.4%) carry a harmful mutation in the BRCA1 or BRCA2 genes. In certain populations, the rate is much higher: about 1 in 40 Ashkenazi Jewish individuals carry one of three specific BRCA founder mutations.
BRCA mutations dramatically increase cancer risk. Women with BRCA1 mutations have a 55-72% lifetime risk of breast cancer (compared to 13% average) and a 39-44% lifetime risk of ovarian cancer (compared to 1.1% average). BRCA2 mutations carry a 45-69% breast cancer risk and an 11-17% ovarian cancer risk. Men with BRCA mutations also have increased cancer risk, particularly for breast cancer and prostate cancer.
Genetic testing is recommended for individuals with a family history suggestive of hereditary cancer (multiple affected relatives, early-onset cancer, specific cancer patterns). For confirmed carriers, risk reduction options include enhanced screening (annual breast MRI starting at age 25), chemoprevention (tamoxifen, oral contraceptives), and risk-reducing surgery (prophylactic mastectomy reduces breast cancer risk by 95%, and salpingo-oophorectomy reduces ovarian cancer risk by 80%).
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