BRCA1 and breast cancer: Only two of these (i.e., MDA-MB-436 and HCC1395) were found to be HRD/HRI, while eight BRCA1/2-mutant BC cell lines (i.e., HCC1954, SUM149PT, HCC1599, SUM1315MO2, HCC202, HCC1937, HCC1569 and BT474) were functionally HRP.