RESUMO
@# Objective: To evaluate the potential associations between the single nucleotide polymorphisms (SNPs) of lncRNA H19 genes and the susceptibility to gastric cancer (GC), especially to EBV-associated gastric cancer (EBVaGC) in Han population in Qingdao. Methods: 225 cases of pathologically confirmed fresh gastric cancer tissues or paraffin embedded gastric cancer tissues during January 2015 and October 2018 were collected from Affiliated Hospital of Qingdao University, as GC group; in the meanwhile, 200 healthy people underwent physical examination at Outpatient were collected as control. The 225 cases of cancer tissues were assigned into two groups according to the transcription result of EBV-encoded small molecule non-polyadenylation (EBER 1) by In situ hybridization: EBVaGC group (70 cases) and EBVnGC group (155 cases). DNA was extracted from the tissues of two groups and peripheral blood of healthy participants.According to the general setting of HaploView software (MAF>0.05, r2>0.8), four TagSNPs (rs217727, rs2735971, rs2839698 and rs3741216) of H19 were screened. Genotyping of each SNP locus was carried out by using Taq-Man MGB allele typing kit, and the gene polymorphisms were examined. Results: H19 SNPs of collected tissue samples were in accordance with the HardyWeinberg equilibrium. Compared with control group, patients carrying TT genotype of H19 rs217727 loci had significantly increased susceptibility to gastric cancer (χ2=9.073, P=0.003, OR=1.999, 95% CI=1.271-3.143), so did the T allele (χ2=13.475, P=0.001, OR= 1.661, 95% CI=1.266-2.180). In contrast, patients carrying TC and CC genotype of rs2839698 loci had significantly increased susceptibility to gastric cancer (χ2=9.407, P=0.002; χ2=6.517, P=0.011), and patients carrying C allele had obviously increased susceptibility to GC (χ2=6.163, P=0.013, OR=1.417, 95%CI=1.076-1.867; χ2=9.542, P=0.02, OR=2.070, 95%CI=1.298-3.302).As for the rs2735971 and rs3741216, there was no significant difference between the GC group and the control group (all P>0.05). The distribution of 4 H19 SNPs showed no statistical difference in both EBVaGC group and EBVnGC group (all P>0.05). Conclusion: There was an association between H19 gene polymorphism (rs217727 and rs2839698) and gastric carcinoma; patients carrying the TT genotype of rs217727 and C allele of rs2839698 may increase the risk of gastric carcinoma. No significant association was observed between H19 SNP polymorphism and risk of EBVaGC.