We tested the effect of BMN 673 in our ERCC1-isogenic system and found that ERCC1-deficient clones were significantly more sensitive to BMN 673 than their ERCC1-proficient counterparts (Figure 2f; Supplementary Table S1). Consistent with the enhanced potency of this compound, the ERCC1-selective effect of BMN 673 was achieved at considerably lower concentrations of PARP1/2 inhibitor than for the other clinical inhibitors...