A gene that ordinarily functions to restrain the rise of cells inside breast and ovary but which, whenever mutated, may predispose to breast cancer and also to ovarian cancer. BRCA2 mutations have also discovered to-be responsible for a substantial fraction of early-onset prostate cancer tumors. The first cancer of the breast genetics identified were BRCA1 and BRCA2. Mutations of BRCA1 and BRCA2 account for about half of all instances of inherited breast cancer. These tumors will take place in women. BRCA1 and BRCA2 are often perhaps not associated with breast cancer that isn't hereditary.