A genetic variant in ERCC2 is associated with gastric cancer prognosis in a Chinese population

Endogenous and exogenous factors can induce DNA damage, leading to increased risk of cancer. Nucleotide excision repair (NER) is considered as the most versatile DNA repair pathway to deal with a variety of different DNA lesions. ERCC1 and ERCC2 are the two important proteins in NER pathway. In this study, we investigated the association of three functional single nucleotide polymorphisms (SNPs) (ERCC1 rs11615, ERCC2 rs13181 and ERCC2 rs1799793) with the clinical outcome of 940 gastric cancer patients in a Chinese population. Multiplex SNaPshot technology was used to genotype these three SNPs. Our results revealed that individuals with ERCC2 rs13181TG/GG genotypes had a decreased risk of death compared with those with TT genotype [log-rank P = 0.008; adjusted hazard ratio = 0.68, 95% confidence interval = 0.51-0.91] and this protective effect was more pronounced among the subgroups of patients with tumour size ≤ 5 cm (0.59, 0.39-0.89), non-cardia gastric tumour (0.69, 0.48-0.98), no lymph node metastasis (0.55, 0.32-0.96), no distant metastasis (0.70, 0.52-0.95) and chemotherapy (0.39, 0.21-0.72). We conclude that ERCC2 rs13181 polymorphism could play different roles in the overall survival of gastric cancer. Further larger studies should be conducted to validate our findings.