BRCA1 and BRCA2
BRCA1 and BRCA2 (Breast Cancer 1 and Breast Cancer 2) are the best-known genes linked to an increased breast cancer risk. Everyone has these genes, but some people have inherited a mutation that increases the risk of breast cancer. Both BRCA mutations may be passed from either parent and may affect the risk of cancers in both men and women. In the United States, BRCA mutations are more common in Ashkenazi Jews than in other racial and ethnic groups, but they develop across races, genders and ethnicities.