IL-1B及IL-1RN基因多态性与胃癌遗传易感性的关系

目的探讨炎症因子IL-1B（T-31C和C-511T）及其拮抗基因IL-1RN基因多态性与胃癌遗传易感性的关系。方法采用病例对照研究,对经组织学确诊的胃腺癌病例180例及其年龄和性别频数匹配的对照308例,以限制性片段长度多态性（RFLP-PCR）方法进行多态性检测,比较不同基因型以及环境因素与胃癌发病风险的关系。结果IL-1B启动子区域T-31C和C-511T基因多态性呈高度连锁不平衡（D’=0.862,R^2=0.721,P=0.000）,未发现IL-1B（T-31C和C-511T）基因多态性与胃癌之间存在显著性关联,显性模型调整比值比（OR）及其95%可信区间（C I）分别为0.95（0.62-1.47）和0.85（0.55-1.31）;IL-1RN变异基因型（1/2和2/2）可增加胃癌的患病风险,但未达到统计学差异（调整OR=1.32,95%C I=0.71-2.36）;分层结果显示在幽门螺旋杆菌（H.pylori）感染组中,IL-1RN变异基因型（1/2、2/2）显著增加胃癌的患病风险（调整OR=2.03,95%C I=1.02-4.80）。结论IL-1RN基因多态性和H.pylori感染可能在胃癌的发生和发展中具有协同作用。

Association between functional genetic polymorphisms of IL-1B and IL-1RN and susceptibility to gastric cancers

Objective To study the association between functional genetic polymorphisms of IL-1B(T-31C,C-511T),IL-1RN and the susceptibility to gastric cancers. Methods A case-control study was conducted in 180 gastric cancer cases and 308 age-and sex-matched cancer-free controls.Genotypes were detected by PCR-restriction fragment length polymorphism(PCR-RFLP) assays,and association between genotypes,environmental factors and risk of gastric cancers were determined. Results IL-1B T-31C was in strong linkage disequilibrium with IL-1B C-511T(D'=0.862,R2= 0.721,P=0.000).Multivariate logistic regression analysis revealed that the variant genotypes of IL-1B T-31C and C-511T were not significantly associated with risks for gastric cancers(adjusted OR,0.95 and 95% CI,0.62-1.47 for IL-1B T-31C;and adjusted OR,0.85 and 95% CI,0.55-1.31 for IL-1B C-511T).The variant genotypes(1/2,2/2) in IL-1RN were associated with a non-significantly increased risks for gastric cancers(adjusted OR,1.32 and 95% CI,0.71-2.36) in all subjects and with a significantly increased risks for gastric cancers in subjects with H.pylori infection(adjusted OR,2.03 and 95%CI,1.02-4.80).Conclusion The functional genetic polymorphisms of IL-1RN may contribute to the risks of gastric cancers in high-risk population,particularly in those with H.pylori infection.