According to the different dominance models of the TNFR1 -609 T allele, we noticed that in cases of dominance and codominance, the combined genotypes (TT+GT) reduced the risk of gastric cancer, but statistically, the results were not significant (OR = 0.5, 95% CI 0.2-1.2, p value = 0.2). The gene discussed is TNFRSF1A; the disease is gastric cancer.