XPA基因多态性与食管癌易感性关系的研究

目的 探讨长治地区食管癌高发的主要环境危险因素和参与DNA损伤修复的XPA基因多态性与食管癌易感性的关系,以及与环境因素之间对食管癌发生的交互作用.方法 采用病例对照研究,对196例食管癌患者和201例对照者进行食管癌相关因素的问卷调查,应用PCR-RFLP技术对XPA 23G多态性基因型检测,采用SPSS 12.0统计软件对研究结果进行分析.结果病例组携带突变(G)等位基因的频率明显低于对照组(X2=18.31,P＜0.01);XPA基因三种基因型在两组间差异有统计学意义(X2=16.56,P＜0.01),且携带有xPA突变杂合子(A/G)和突变纯合子(G/G)的个体发生食管癌的危险性比携带野生纯合子(A/A)个体低[OR值(95%CI)分别为0.58(0.37～0.91)和0.32(0.18～0.56)].携带XPA突变基因G与经常食用腌制食品之间存在负交互作用(S=0.04,API=-0.77).结论 XPA 23G多态性可能与长治地区食管癌的发生有一定关系,携带XPA突变基因G可抑制食用腌制食品对食管癌的发生.

Study on the relationship between polymorphisms of XPA gene and susceptibility of esophageal cancer

Objective To explore the relationships between the polyrnorphisms of xeroderma pigmentosum A(XPA) and the susceptibility of esophageal cancer (EC),as well as its interaction with environmental factors-gene in Changzhi area,Shanxi province. Methods A case-control study was conducted,including 196 cases of EC and 201 controls.XPA 23G polymorphisms were determined with polymerase chain-restriction on fragment length polymorphism (PCR-RFLP).Results The risk of EC was significantly degraded in the individuals who had been carrying the XPA heterozygote (A/G) and mutation genotype (G/G),compared to those with wild genotype (X2=16.21,P＜0.01) and the ORs were 0.58 (0.37-0.91) and 0.32 (0.18-0.56),respectively.There was negative interaction between XPA 23G mutation genotype and the consumption of pickled food (S=0.04,API=-0.77).Conclusion Genetic polymorphism in the XPA 23G might be associated with esophageal cancer in Changzhi area,and there was a negative action between XPA predisposing genotype and the consumption of pielded food.