BRCA1 and breast cancer: Among BRCA mutations identified in breast cancer patients BRCA1_c.211dupA, BRCA1_c.5266dupC,BRCA2_c.-227-?_7805+?,BRCA2_1310_1313delAAGA, BRCA2_c.1389_1390delAG and BRCA2_c.7654dupA occurred in BCCRs that are considered to be associated with an increased likelihood of breast cancer compared to ovarian cancer.