XRCC1 and lung carcinoma: In an analysis of 103 patients with stage IIIA–IV lung cancer, those with one or two variant alleles at XRCC1 (Arg399Gln) or XPD (Asp312Asn) showed poorer OS compared with those carrying homozygous wild-type alleles (P = 0.07 and P = 0.003, respectively).