Common variations of DNA repair genes are associated with response to platinum-based chemotherapy in NSCLCs

Aim: Individual differences in chemosensitivity and clinical outcome of non-small-cell lung cancer (NSCLC) patients may be induced by host inherited factors. We investigated the impact of XPD Arg156Arg, XPD Asp312Asn, XPD Asp711Asp and XPD Lys751Gln gene polymorphisms on the efficacy of platinum-based chemotherapy in NSCLC patients. Methods: A total of 496 were consecutively selected from the Affiliated Hospital of Nantong University between Jan. 2003 and Nov. 2006, and all patients were followed-up until Nov. 2011. The genotyping of XPD Arg156Arg, XPD Asp312Asn, XPD Asp711Asp and XPD Lys751Gln was conducted by duplex polymerase-chain-reaction with the confronting-two-pair primer methods. Results: Individuals with XPD 312 C/T+T/T and XPD 711 C/T+T/T exhibited poor responses to chemotherapy when compared with the wildtype genotype, with adjusted ORs(95% CI) of 0.67(0.38-0.97) and 0.54(0.35-0.96), respectively. Cox regression showed the median PFS and OS of patients of XPD 312 C/T+T/T genotype and XPD 711 C/T+T/T genotype to be significantly lower than those with wild-type homozygous genotype. Conclusion: We found polymorphisms in XPD to be associated with response to platinum-based chemotherapy in NSCLC, and our findings provide information for therapeutic decisions for individualized therapy.