PARP1 and breast carcinoma: E. Ribeiro et al. studied the expression of 13 DNA repair genes in TNBC (PARP1, ERCC1, XPA, XPD, XPF, XPG, BRCA1, FANCA, FANCC, FANCD2, FANCF, PALB2, and Chk1) compared with breast cancer of the luminal A subtype.