Abstract

Association of DNA repair gene polymorphisms with response to chemotherapy and prognosis of gastric cancer

We investigated the correlation between the response to chemotherapy in patients and excision repair cross-complimentary group 1 gene (ERCC1) and xeroderma pigmentosum complementation group F gene (XPF) polymorphisms and the effect of these polymorphisms on the clinical outcome of gastric cancer. Samples from a total of 255 patients with newly diagnosed and histopathologically confirmed primary gastric cancer were collected in our study. The ERCC1 rs11615, ERCC1 rs2298881, XPF rs2276465, and XPF rs6498486 polymorphisms were genotyped. Among the 255 patients, the median follow-up time was 29.7 months. A total of 103 patients (40.4%) died from gastric cancer during the follow-up period. We observed that the XPF rs6498486 CC genotype and the XPF rs2276465 GG genotype were associated with response to chemotherapy, with odds ratios and 95% confidence intervals of 3.88 (1.23-16.07) and 2.66 (1.17-6.45), respectively. In the Cox proportional hazards model, patients carrying the ERCC1 rs11615 AA genotype and the XPF rs2276465 GG genotype showed only a 0.22- and 0.30-fold increased risk of death from gastric cancer. We found that the XPF rs6498486 and XPF rs2276465 polymorphisms are markers of response to oxaliplatin/5-fluorouracil-based chemotherapy in gastric cancer patients.

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