PARP1 and neoplasm: The genes BRCA2 (P=0.009), ATM (P=0.004),FANCA (P=0.001), and PARP1 (P=0.011)showed a lower expression in post-NACT residual tumor samples (n=32) than inpre-NACT biopsy samples (n=98) (Table 2and Figure 4).