Association between the polymorphisms in XPG gene and gastric cancer susceptibility in Chinese populations: A PRISMA-compliant meta-analysis

BACKGROUND: Several previous studies were carried out on the association between xeroderma pigmentosum group G (XPG) gene polymorphisms (including rs873601 G>A, rs2094258 C>T, rs2296147 T>C, and rs751402 C>T) and the risk of gastric cancer in Chinese populations. However, their conclusions were not consistent. Therefore, this meta-analysis was performed by us to investigate the association between the 4 potentially functional single nucleotide polymorphisms (SNPs) of XPG gene and gastric cancer risk. METHODS: The eligible literatures were identified through PubMed, Embase, Ovid MEDLINE, Web of Science, CNKI, and Wan fang databases up to July 2017. Finally, 5 studies for rs873601, 7 studies for rs2094258, 4 studies for rs2296147, and 8 studies for rs751402 were used for the current meta-analysis. RESULTS: Of the 4 included SNPs, only rs751402 was showed to be associated with the risk of gastric cancer [C vs T, odds ratio (OR) = 1.16, 95% confidence interval (CI) = 1.04–1.29; CC + CT vs TT, OR = 1.23, 95% CI = 1.00–1.52; CC vs CT + TT, OR = 1.15, 95% CI = 1.05–1.27; CC vs TT, OR = 1.35, 95% CI = 1.06–1.72; CC vs CT, OR = 1.13, 95% CI = 1.02–1.25]. CONCLUSION: The current meta-analysis demonstrated that the XPG gene polymorphism rs751402 was associated with increased susceptibility to gastric cancer in Chinese populations. However, studies with a larger number of subjects among different ethnic groups are needed to further validate the results.