细胞色素P450 1A1和谷胱苷肽硫转移酶基因多态性与肺癌关系的病例对照研究

目的　探讨细胞色素P4 5 0 1A1(CYP 1A1)和谷胱苷肽硫转移酶 (GST) M1基因多态性与肺癌易感性的关系。方法　选取新发肺癌患者 91例及同期非肺部疾患同性别患者 91例作匹配 ,另选取体检正常者 4 7例做频数对照 ,采用聚合酶链式反应 (PCR)和限制性片段长度多态性 (RFLP)技术检测CYP 1A1和GST M1的基因多态性。结果　单独分析CYP 1A1和GST M1基因多态性与肺癌的关系 ,其OR值分别为 1.5 3和 1.4 2 ,与对照组比较 ,差异均无显著性 (P >0 .0 5 ) ,表明与肺癌的发生无相关性。而将二者联合分析时 ,其OR值为 2 .4 7,95 %CI为 1.0 3～ 5 .90 ,与对照组比较 ,差异有显著性(P <0 .0 5 ) ,表明与肺癌的发生有一定相关性。结论　CYP 1A1和GST M1的单一基因多态性不增加患肺癌的危险 ,而两者联合作用时 ,则可增强患肺癌的风险。

A case control study on the impact of CYP450 MSPI and GST-M1 polymorphisms on the risk of lung cancer

Objective To study the correlation of polymorphisms of CYP1A1 MSPI and glutathiones S-transferase(GST-M1) independently and in combination with the risk of lung cancer. Methods A case control study which included 91 cases of lung cancer and 138 controls collected from the First Affiliated Hospital of Sun Yat-sen University of Medical Sciences, Guangzhou Tumor Hospital and The Red Cross Hospital of Guangzhou or conmunity area. All subjects were investigated with a uniform questionnaire. Blood samples were collected from all cases and controls for detecting CYP1A1 MSPI and GST-M1 polymorphisms which were analyzed by PCR and RFLP. Results It showed that there was no significant difference in frequencies of this genotypes of CYP1A1 MSPI between the two groups. The frequency of GST-M1 null(0/0) genotype was higher in the case group than in the control group, with an OR of 1.38(95%CI 0.81-2.38), but there was no statistical significance. However, combination of several genotypes was strongly associated with lung cancer. There was a synergistic interaction between the m2m2 genotype of CYP1A1 MSPI and GST-M1(0/0)genotype, with an OR of 2.47 (95%CI 1.03-5.90). Conclusion The combination of two genetic polymorphisms significantly increases the risk of lung cancer.