Interleukin-10 -1082 promoter polymorphism and gastric cancer risk in a Chinese Han population.

Studies investigating the association between interleukin-10 (IL-10) -1082 promoter polymorphism and gastric cancer risk report conflicting results. Our recent meta-analysis suggests that the IL-10 -1082 promoter polymorphism may be associated with gastric cancer among Asians. The objective of this study was to investigate the association between IL-10 -1082 promoter polymorphism and gastric cancer risk in Chinese Han patients. We extracted the peripheral blood samples in 150 patients with gastric cancer and 150 controls. PCR-RFLP analysis was performed to detect IL-10 -1082 promoter polymorphism in these patients. Patients with gastric cancer had a significantly lower frequency of AA (OR = 0.45, 95% CI = 0.27, 0.76; P = 0.003) than controls. Patients with cardia gastric cancer had a significantly higher frequency of GG (OR = 2.17, 95% CI = 1.08, 4.38; P = 0.03) than those with noncardia gastric cancer. Patients with advanced gastric cancer had a significantly higher frequency of AA (OR = 5.21, 95% CI = 1.71, 15.87; P = 0.004) than those with early gastric cancer. When stratified by the Lauren's classification, histological differentiation of gastric cancer, no statistically significant results were observed. This study suggests that the IL-10 -1082 promoter polymorphism may be associated with gastric cancer in Chinese Han patients, and that difference in genotype distribution may be associated with the location and stage of gastric cancer.