BARD1 and breast carcinoma: Other homologous recombination DNA damage repair (HR-DDR) genes associated with breast cancer risk accounted for 15.9% (13/82) of the carriers, including ATM (n = 2), BARD1 (n = 4), CHEK2 (n = 1), PALB2 (n = 2), RAD51C (n = 1), and RAD51D (n = 3).