Association between tumor necrosis factor-β gene polymorphisms and genetic predisposition to gastric cancer
Objective To investigate the association between tumor necrosis factor-β(TNF-β)gene polymorphisms and genetic predisposition to gastric cancer,and to analyze the relationship between specific genotype of TNF-β and serum levels of TNF-β.Methods Using case control study,we selected 153 patients with gastric cancer in Fudan University Shanghai Cancer Center between September 2021 and December 2022 as the gastric cancer group,and 150 healthy individuals were chosen as the healthy control group.In the previous study,30 peripheral blood DNA samples of gastric cancer patients and healthy controls respectively were amplified by conventional PCR,which were sequenced to identify the genotype frequencies of TNF-β polymorphic loci(rs1041981,rs2229092,rs2229094 and rs78613290);consequently,Allele-Specific Quantitative PCR was used to further detect and analyze the genotype and genotype frequencies of TNF-βpolymorphic loci;serum TNF-β levels were measured by Enzyme-Linked Immunosorbent Assay(ELISA),and the relationship with specific genotypes of TNF-β was analyzed.Chi-square test and Fisher test were used to analyze the genotype distribution frequency of TNF-β polymorphic loci,and non-parametric statistics was used to analyze the differences in serum TNF-β expression levels.Results The sequencing results showed that the genotype distribution of rs1041981 in gastric cancer group was CC 16.67％(5/30),CA 40.00％(12/30)and AA 43.33％(13/30).The genotype distribution in control group was CC 40.0％(12/30),CA 43.33％(13/30),AA 16.7％(5/30).The difference of genotype frequency between the two groups was statistically significant(x2=6.478,P=0.039).The genotypes of the polymorphic loci rs2229092 in both groups were AA,AG,and GG,with no statistically significant difference between the two groups(x2=1.888,P=0.612).The distribution frequencies of the genotypes of the polymorphic loci rs2229094(TT and TC)and rs78613290(GG and AG)showed no statistically significant differences between the two groups(both P＞0.05).Further validation with an expanded clinical samples(153 cases in the gastric cancer group and 150 cases in the control group)found that the difference of rs1041981 genotype distribution between the gastric cancer group[CC 15.69％(24/153),CA 54.9％(84/153),AA 29.4％(45/153)]and the control group[CC 27.3％(41/150),CA 58.0％(87/150),AA 14.7％(22/150)]was significantly different(x2=12.366,P=0.002).Analysis of the influence of different allele frequencies on the risk of gastric cancer revealed that the odds ratio(OR)of the A allele of rs1041981 for the risk of gastric cancer compared to the C allele was 1.701(95％CI 1.235-2.355).Gene phenotype analysis combining the clinicopathological characteristics of gastric cancer patients found that the distribution frequency of the rs1041981 genotype was significantly different among groups of different genders,tumor invasion depths,and the lymph node metastasis,with statistically significant differences(All P＞0.05).Additionally,gastric cancer patients with rs1041981 AA genotypes had higher serum TNF-β expression levels than those with CA and CC genotypes,(both P＜0.05).Conclusions The gene type frequency of the TNF-β gene polymorphic loci(rs1041981,C＞A)exhibited significant differences between the gastric cancer group and the healthy control group.The presence of the A allele in rs1041981 site increased the susceptibility to gastric cancer,and patients with different gene types displayed vaning levels of serum TNF-β,among which AA genotype ranks the highest level.
万方数据
维普
