CYP1A1和GSTM1基因多态性与肺癌易感性的Meta分析

目的探讨CYP1A1和GSTM1基因多态性与个体肺癌易感性的关系。方法全面检索相关文献,应用Meta分析方法对各研究进行数据的合并与分析。结果共8篇文献入选,累计肺癌病例1067人,对照1416人,分别对CYP1A1*A和GSTM1-、CYP1A1*B/C和GSTM1+、CYP1A1*B/C和GSTM1-联合基因型进行统计分析。异质性检验χ2值分别为6.43、8.83与9.63,P>0.05,文献有同质性,各合并OR及95%CI分别为1.36(1.09~2.77)、1.65(1.26~2.15)和2.01(1.57~2.59)。结论CYP1A1和GSTM1突变基因型为罹患肺癌的易感基因型,且两者存在协同作用,在肿瘤防治方案中应加以重视从而采取相应措施达到有效预防肿瘤的目的。     

CYP2C9、GSTM1基因多态性与肺癌易感性的关系

目的探讨细胞色素P4502C9(CYP2C9)基因、谷胱甘肽硫转移酶M1(GST M1)基因多态性与肺癌易感性的关系。方法用PCR-RFLP法分析56例肺癌(简称肺癌组)和42例健康对照组NsiⅠ识别的CYP2C9基因型;用PCR法分析其GST M1基因型。结果突变型CYP2C9*3型基因发生频率在肺癌组中为8.93%,高于对照组的4.76%,其差异无显著性(P>0.05)。肺癌组GST M1基因缺失型〔GST M1(-)〕发生率为71.43%,高于对照组的45.24%,其差异有显著性(P<0.01);GST M1(-)型与肺癌呈高度联系强度,OR=3.09(95%CI=1.32~6.94);GST(-)基因型在吸烟的肺癌组(81.08%)与对照组(52.18%)之间的频率差异有显著性(P<0.05)。结论突变型CYP2C9*3型基因与肺癌无显著性联系;GST M1(-)基因型是肺癌发生的遗传易患性因素;吸烟可显著提高GST(-)基因型个体患肺癌的危险性。     

GSTM1和CYP2E1基因多态性与肺癌遗传易感性关系的研究

背景与目的肺癌是中国人群恶性肿瘤死因的首位，其发病可能与肺癌人群中某些肺癌相关基因的遗传多态性有关。本研究旨在探讨细胞色素P4502E1(CYP2E1)基因RsaⅠ／PstⅠ多态性和谷胱甘肽转移酶M1(GSTM1)基因多态性与肺癌易感性之间是否存在相关性。方法应用PCR-RFLP和PCR法检测99例人非小细胞肺癌患者和66例同期住院的肺良性疾病患者CYP2E1基因的RsaⅠ／PstⅠ多态性和GSTM1基因多态性，并分析其与肺癌遗传易感性的相关性。结果(1)CYP2E1基因RsaⅠ／PstⅠ多态性的三种基因型在肺癌组和对照组的频率差异没有统计学意义(χ^2=1．374，P=0．241)。(2)肺癌组GSTM1(-)基因型频率显著高于对照组(分别为57．6％和40．9％)(χ^2=4．401，P=0．036)。(3)携带GSTM1(-)基因型的个体患肺癌的危险性显著高于GSTM1( )基因型的个体(OR=1．96，95％CI=1．042～3．689，P=0．037)。(4)与携带c1／c2或c2／c2基因型的不吸烟个体比较，携带c1／c1基因型的吸烟者患肺癌的风险显著增加(OR=3．525，95％CI=1．168～10．638，P=0．025)。(5)联合分析CYP2E1基因RsaⅠ／PstⅠ多态性和GSTM1基因多态性，携带有c1／c1和GSTM1(-)基因型的个体患肺癌的风险显著高于携带GSTM1( )和c1／c2或c2／c2基因型的个体(OR=3．449，95％CO=1．001～11．886，P=0．050)。按照吸烟因素分层，携带有GSTM1(-)和c1／c1基因型的不吸烟个体患肺癌的风险显著高于携带GSTM1( )和c1／c2或c2／c2基因型的不吸烟个体(OR=11．553，95％CI=1．068-124．944，P=0．044)，携带有GSTM1(-)和c1／c2或c2／c2基因型的不吸烟个体患肺癌的风险同样显著高于携带GSTM1( )和c1／c2或c2／c2基因型的不吸烟个体(OR=13．374，95％CI=1．258～142．166，P=0．032)。结论(1)GSTM1(-)基因型增加人群患肺癌的风险；(2)CYP2E1的c1／c1基因型和GSTM1(-)基因型的联合可增加吸烟和不吸烟人群患肺癌的风险。     

CYP1A1、GSTM1基因多态性及其联合作用与食管癌的易感性

目的探讨CYP1A1、GSTM1基因多态性及其联合作用与新疆汉族人食管癌易感性的关系。方法采用聚合酶链式反应-连接酶检测反应分析方法检测107例食管癌患者和204例非食管癌患者的CYP1A1(rs1048943、rs4646421和rs4646903)和GSTM1(缺失型和rs2071487)的基因型。结果CYP1A1基因rs1048943位点的等位基因和基因型频率在病例组和对照组之间比较,总体分布差异有统计学意义(χ² =5.52,P=0.019)。与A/A基因型相比,GG+AG基因型可增加食管癌的发病风险(OR=1.79,OR95%CI:1.10~2.92);GSTM1基因缺失型和非缺失型在病例组和对照组中的分布频率分别为68.69%、31.31%和48.39%、51.61%,在两组间的分布差异有统计学意义(χ²=10.55,P=0.001;OR=2.34,OR95%CI:1.40~3.91)。结论CYP1A1基因rs1048943位点多态性和GSTM1基因缺失型与新疆地区汉族人食管癌易感性有相关性。     

58. Susceptibility to lung cancer is associated with genetic polymorphisms of CYP1A1、GSTM1

Objective: To investigate the association of lung cancer susceptibility with genetic Polymorphism of CYP1A1 and GSTM1. Methods: The study was conducted on 65 lung cancer cases and 60 no-cancer controls. The genetic polymorphism both CYP1A1 and GSTM1 were performed in cancer tissues of all patients and peripheral blood leukocytes of no-cancer controls. First by RFLP-PCR, then after incubating with restriction enzyme Ncol and Hinfl. Results: ①There were no significant differences in the frequency distribution of CYP1A1 polymorphisms between lung cancer patients and controls, but the frequency of CYP1A1(Val/Val) was significant higher than that controls (P<0.05). ②If OR for CYP1A1 (Ile/Ile) genotype was 1.0, the OR of CYP1A1 (Ile/VaL)、CYP1A1 (Val/Val) was 1.68 (95%CI, 0.79～3.59) and 3.2 (95%CI, 1.06～10.26), respectively. ③The significant difference were observed that GSTM1(-) became markedly expressed (63.1%, 41/65) in elung cancer patients than in the corresponding controls (45%, 27/60) (P<0.05), OR was 2.09 (95%CI, 1.02～4.26); ④When analysis combined CYP1A1 and GSTM1 genotype, we found that individual who take along CYP1A1 (Ile/Ile)/GSTM1 (-) or CYP1A1 (Ile/Val+Val/Val)/GSTM1 (+) genotype had higher odds ratio than CYP1A1 (Ile/Ile)/GSTM1 (+) genotype, the OR was 3.82 (95%CI, 1.27～11.45) and 3.5 (95%CI 1.18～10.41), respectively, but the CYP1A1 (Val/Val) / GSTM1 (-) genotype was the hightest odds ratio, the OR was 10.5 (95%CI, 1.70～64.73). ⑤We observed that the individual who carry CYP1A1(Val/Val) genotype can increased risk of squamous cell carcinoma of lung (P<0.05), OR was 2.75 (95%CI, 1.24～6.17), there was no significant associated of pathologic with GSTM1 genotype. ⑥Stratified analysis suggested an interaction between cigarettes smoking and CYP1A1 (Ile/Val+Val/Val)、GSTM1 (-) genotype. Conclusion: ①The individuals who carried genotype of CYP1A1 (Val/Val) and GSTM1 (-) were susceptible to lung cancer. ②the individuals who carried CYP1A1 (Ile/Ile) /GSTM1 (-) or CYP1A1 (Ile/Val+Val/Val) /GSTM1 (+) genotype with higher risk of developing lung cancer than that CYP1A1 (Ile/Ile)/GSTM1 (+) genotype. ③There were interaction between smoking and CYP1A1 (Ile/Val+Val/Val)、GSTM1 (-)     

NQO1、CYP1A1、mEH基因多态性与肺癌易感性关系的病例—对照研究

肺癌是世界上发病率和死亡率增长较快的恶性肿瘤。在中国，肺癌已被列为城市人口恶性肿瘤死因之首，并有继续增长之势。研究认为，人群对化学物质诱发肿瘤的易感性与环境致癌物供谢相关酶的遗传变异性有关。关于肺癌易感性的探讨，近年来对NQO1、CYP1A1、CYP2E1、mEH等基因的遗传多态性开展了研究，已取得了一些有价值的结果。为探讨南京地区人群肺癌易感基因，我们应用配对病例－对照研究方法，收集南京市区原发性肺癌患者84例，同时按1：1配对选择正常对照84例，进行流行病学调查。采用PCR技术，对样本DNA进行NQO1、CYP1A1、mEH-exon3、mEH-exon4基因型的检测，并分析各基因型与肺癌易感笥的关系。研究结果表明，南京市正常人群中，相关基因野生型纯合子wt/wt、杂合子wt/vt、突变型纯合子vt/vt3种基因型的频率分布情况分别是：N1O129.5%,51.1%,19.3%,CYP1A1 35.2%,44.3%,20.5%;mEH-exon3 26.1%,56.8%,17.0%;mEH-exon4 83.05,15.9%,1.1%。以上情况与国外的有关报道存在一定差异，与不同地区中国人群的频率分布特征基本一致。种族差异可能是造成有关基因型分布差异的重要原因。南京市区人群NQO1、CYP1A1和mEH-exon4与肺癌易感性没有明显差异。mEH-exon3基因型与肺鳞癌发生有关，野生型个体可降低肺癌发病的风险（PR＝0.32,95%CI：0.0078-0.63)，杂合型和突变型个体患肺鳞癌的危险性明显高于野生型个体（OR＝3.1,95%CI:0.08-6.12)；考虑吸烟因素后，mEH-exon3基因型与吸烟者肺癌发生有关，野生型个体可使肺癌发病风险性降低（OR：0.18,95%CI:0.06-0.29)，杂合型和突变型个体患肺癌的危险性增高9OR：5.66,95%CI:2.01-9.30)。综上所述，南京市人群中NQO1、CYP1A1、mEH基因的分布情况与国内外的相关报道存在一定差异，种族差异、地域不同可能是造成肺癌易感基因不同的重要原因。南京市人群中mEH-exon3基因杂合型和突变型与肺鳞癌发生有关，与吸烟者肺癌发生关系更为密切。     

四川人群中CYP1A1基因Ile-Val和Msp1位点多态性与肺癌易感性的研究

目的　探讨细胞色素P45 0 (CYP1A1)基因异亮氨酸 (Ile) 缬氨酸 (Val)位点和Msp1位点多态性和肺癌易感性的相关关系。方法　以病例对照的研究方法 ,采用PCR RFLP和ASA PCR技术检测 82例原发性肺癌和 91例对照的CYP1A1基因Ile Val位点和Msp1位点多态性。 结果　Ile Val三种多态基因型在肺癌组和对照组分布差异有显著性 (P <0 .0 5 ) ,Ile/Val、Val/Val基因型在肺癌组的分布频率明显高于对照组 ;logistic回归分析结果显示Ile/Val、Val/Val基因型患肺癌的危险分别是Ile/Ile基因型的 1.969倍和3 .15 0倍 ;当按吸烟分层后 (将Ile/Val、Val/Val基因型合并分析 ) ,吸烟组中Ile/Val、Val/Val合并基因型患肺癌的危险是Ile/Ile基因型的 3 .0 5 9倍 ,而在不吸烟组其OR为 1.687;Msp1位点多态性在肺癌组和对照组差异无统计学意义。结论　CYP1A1第 7外显子的Ile/Val、Val/Val基因型与肺癌的易感性有关 ,可望作为肺癌易感人群筛选的重要指标 ;尚不能认为Msp1多态性与肺癌的易感性有关     

CYP1A1和GSTM1基因多态性及其对个体肺癌易感性的联合效应:meta分析

背景与目的谷胱甘肽转移酶M1(glutathione S-transferase M1,GSTM1)和细胞色素P4501A1(cyto-chrome P450A1,CYP1A1)均存在基因多态性,并且对肺癌发病风险有一定的影响,两者联合作用对肺癌发病风险的影响尚无确切定论。本研究旨在探讨CYP1A1和GSTM1基因多态性及其联合效应与肺癌危险性的关系。方法在PubMed数据库、EMBASE数据库、中国生物医学文献数据库(china biology medicine,CBM)和中国知识基础设施工程数据库(china national knowledge infrastructure,CNKI)中查询文献,时间范围从各数据库建库至2011年3月。使用STATA10软件进行meta分析统计,对于每篇入选的文献均计算肺癌发生危险性调整混杂因素后优势比(odd ratio,OR)及其95%置信区间(confidence interval,CI)。结果 15篇文献最终被纳入本次研究。Meta分析显示GSTM1基因缺失时CYP1A1基因IIe/Val位点为纯合突变型时肺癌发病风险明显高于杂合型与纯合突变型联合,总体OR分别...     

南京市人群NQO1、CYP1A1、mEH基因多态性与肺癌易感性研究

目的：探讨南京市人群人NQO1，CYP1SA1，mEH-exon3,mEH-exon4基因多态性与肺癌易感性的关系。方法：用病例－对照研究方法，收集南京市区原发性肺癌患者84例，其中鳞癌35例，腺癌49例，同时选择对照84例，采用PCR技术，对样本NDA进行NQO1，CYP1A1，mEH-exon3,mEH-exon4基因的检测，并分析各基因型与肺癌易感性的关系。结果：南京市区人群NQO1，CYP1A1和mEH-exon4与肺癌易感性没有明显关系。mEH-exon3基因型与肺鳞癌发生有关，野生型个体可降低肺鳞癌发病的风险（OR＝0．32，95％CI：0．0078－0．63），杂合型和突变型个体患肺鳞癌的危险性明显高于野生型个体（OR＝3．1，95％CI：0．08－6．12），考虑吸烟因素后，mEH-exon3基因型与吸烟者肺癌发生有关，野生型个体可使肺癌发病风险性降低（OR＝0．18，95％CI：0．06－0．29），杂合型和突变型个体患肺癌的危险性增高（OR＝5．66，95％CI：2．01－9．30）。结论：南京市人群中NQO1，CYP1A1，mEH基因的分布情况与国内外的相关报道存在一定差异；种族差异，地域不同可能是造成上述基因分布不同的重要原因，南京市人群中mEH-exon3基因杂合型和变型与肺鳞癌发生有关，与吸烟者肺癌发生关系更为密切。     

CYP1A1和GSTM1与胃癌、萎缩性胃炎和胃溃疡等易感性的研究

目的：探讨细胞色素氧化酶基因（CYP1A1）和谷胱甘肽转硫酶基因（GSTM1）多态性与胃癌和萎缩性胃炎等胃部疾病易感性的关系。方法：对病理诊断的胃癌（GC）102例，慢性萎缩性胃炎（CAG）110例，胃溃疡（GU）62例，慢性浅表性胃炎（CSG）103例，十二指肠溃疡（DU）62例，正常人62例的CYP1A1和GSTM1基因型采用序列特异性引物的聚合酶链反应（PCR－SSP）方法进行测定，关联度分析采用病例对照研究方法，结果：非条件Logistic回归在调整年龄，性别，文化程度和职业4个因素后，GG，CAG和GU与CYP1A1 G／G，GSTM10／0基因型，幽门螺杆菌（Hp)感染及吸烟有关联，同时基因型间存在明显的交互作用，没有发现DU和CSG与CYP1A1和GSTM1基因型有关联，但DU与幽门螺杆菌（Hp)感染有关联，而且Hp感染，吸烟与CYP1A1 G／G型之间存在交作用。结论：CYP1A1 G／G，GSTM10／0基因型与GC，CAG，GU的易感性有磁联，两个基因型之间及它们各自与Hp感染与吸烟之间有交互作用。     

CYP1A1 GSTM1基因多态性和吸烟与肺癌易感性关系的病例对照研究

目的:探讨天津市居民致癌物代谢酶CYP1A1和GSTM1基因多态性对肺癌易感性的影响。方法:利用限制性片断长度多态性-聚合酶链反应(RFLP-PCR)方法检测原发性肺癌患者和健康对照者细胞色素P450酶基因CYP1A1Msp位点和谷胱甘肽硫转移酶基因GSTM1的多态性情况。结果:肺癌组与对照组之间CYP1A1和GSTM1基因型分布差异均存在统计学显著意义(P<0.05)。携带CYP1A1变异基因型或GSTM1阴性基因型的个体患肺癌的危险性增高,比值比(OR)分别达到2.44(1.04～5.81)和1.84(1.03～3.29)。多因素分析结果显示具有CYP1A1变异基因型、GSTM1阴性基因型的吸烟个体患肺癌的风险较大。结论:CYP1A1Msp位点变异基因型和GSTM1阴性基因型可能是肺癌的易感因素,吸烟与肺癌易感基因之间具有协同作用。     

细胞色素P450 2E1和谷胱甘肽转硫酶P1基因与食管癌易患性

目的研究与致癌物亚硝胺代谢激活有关的细胞色素Ｐ４５０２Ｅ１基因（ＣＹＰ２Ｅ１）,和与致癌物代谢解毒有关的谷胱甘肽转硫酶Ｐ１基因（ＧＳＴＰ１）多型性与食管癌易患性的关系。方法采用病例－对照分子流行病学方法。以ＰＣＲ－ＲＦＬＰ方法分析食管癌、食管上皮重度增生病例,和与其年龄性别配对的正常对照者（各４５例）ＣＹＰ２Ｅ１和ＧＳＴＰ１的基因型。结果ＧＳＴＰ１基因型在病例和对照者中的分布无显著差别,但ＲｓａＩ识别的ＣＹＰ２Ｅ１基因型,在食管癌、食管上皮重度增生病例及其正常对照者中的分布差别显著。ＣＹＰ２Ｅ１突变型基因频率在正常对照组中为５５．６％,显著高于食管上皮重度增生病例（１７．８％）和食管癌病例（２０．０％;χ２＝２０．８,Ｐ＜０．００１）;携带野生型ＣＹＰ２Ｅ１的个体,发生食管上皮重度增生和食管癌的危险性,比携带变异型ＣＹＰ２Ｅ１的个体各高５倍。结论ＣＹＰ２Ｅ１基因是涉及食管癌变早期过程的遗传易患性因素。     

Association between Restriction Fragment Length Polymorphism of the Human Cytochrome P450IIE1 Gene and Susceptibility to Lung Cancer

Cytochrome P450IIE1 (P450IIE1) is involved in metabolic activation of carcinogenic nitrosamines, aniline and benzene. We detected a restriction fragment length polymorphism of the human P450IIE1 gene with the restriction endonuclease Oral. The population was thus divided into three genotypes, namely, heterozygotes (CD) and two forms of homozygotes (CC and DD). The distribution of these genotypes among lung cancer patients differed front that among controls with statistical significance of P< 0.05 (x²=7.01 with 2 degrees of freedom). This result strongly suggests that host susceptibility to lung cancer is associated with the Dral polymorphism of the P450IIE1 gene.     

Cytochrome P450 1A1, 2E1 and GSTM1 Gene Polymorphisms and Susceptibility to Colorectal Cancer in the Saudi Population

Background: The Saudi population has experienced a sharp increase in colorectal and gastric cancer incidenceswithin the last few years. The relationship between gene polymorphisms of xenobiotic metabolizing enzymesand colorectal cancer (CRC) incidence has not previously investigated among the Saudi population. The aimof the present study was to investigate contributions of CYP1A1, CYP2E1, and GSTM1 gene polymorphisms.Materials and Methods: Blood samples were collected from CRC patients and healthy controls and genotypeswere determined by polymerase chain reaction restriction fragment length polymorphism and sequencing.Results and Conclusions: CYP2E1*6 was not significantly associated with CRC development (odd ratio=1.29;confidence interval 0.68-2.45). A remarkable and statistically significant association was observed amongpatients with CYP1Awt/*2A (odd ratio=3.65; 95% confidence interval 1.39-9.57). The GSTM1*0/*0 genotypewas found in 2% of CRC patients under investigation. The levels of CYP1A1, CYP2E1 and GSTM1 mRNAgene expression were found to be 4, 4.2 and 4.8 fold, respectively, by quantitative real time PCR. The results ofthe present case-control study show that the studied Saudi population resembles Caucasians with respect to theconsidered polymorphisms. Investigation of genetic risk factors and susceptibility gene polymorphisms in ourSaudi population should be helpful for better understanding of CRC etiology.     

High Susceptibility to Lung Cancer Analyzed in Terms of Combined Genotypes of P450IA1 and Mu-class Glutathione S-Transferase Genes

Lung cancer is closely associated with cigarette smoking. Aromatic hydrocarbons in smoke, including benzo[n]pyrene, first require metabolic activation by Phase I enzymes, cytochrome P450, to their ultimate forms, and these activated forms are then subjected to detoxification by Phase II enzymes, especially glutathione S-transferases. Thus, genetically determined susceptibility to lung cancer may depend on the metabolic balance between Phase I and Phase II enzymes. In this study, we identified individuals genetically at high risk of lung cancer in terms of polymorphisms of the P450IA1 gene and GST1 gene. The relative risk of individuals with a combination of the genotypes of both a homozygous rare allele of the P450IA1 gene and the nulled GST1 gene was remarkably high at 5.8 for lung cancer and 9.1 for squamous cell carcinoma compared with other combinations of genotypes.     

Polymorphism in GSTM1, GSTT1, and GSTP1 and Susceptibility to Lung Cancer in a Japanese Population

Polymorphisms in glutathione S-transferases (GSTs) may predispose to lung cancer through deficient detoxification ‍of carcinogenic or toxic constituents in cigarette smoke, although previous results have been conflicting. Three GST ‍polymorphisms (GSTM1, GSTT1 and GSTP1) were determined among 86 male patients with lung carcinomas and ‍88 healthy male subjects. We found no significant increase in the risk of lung cancer for any genotypes for the nulled ‍GSTM1 [odds ratio (OR)=2.0; 95% confidence interval (95% CI)= 0.8-5.3], the nulled GSTT1 (OR=2.0; 95% CI=0.8- ‍5.1) or the mutated (the presence of a Val-105 allele) GSTP1 (OR=0.96; 95% CI=0.4-5.5). The GST polymorphisms ‍alone may thus not be associated with susceptibility to lung carcinogenesis in male Japanese. However, individuals ‍with a concurrent lack of GSTM1 and GSTT1 had a significantly increased risk (OR=2.7; 95% CI=1.0-7.4) when ‍compared with those having at least one of these genes. No other combinations were associated with lung cancer ‍risk. These results suggest that there may be carcinogenic intermediates in cigarette smoke that are substrates for ‍both GSTM1 and GSTT1 enzymes and that lung cancer risk is increased for individuals who are doubly deleted at ‍GSTM1 and GSTT1 gene loci. Additional large studies are needed to confirm this observation.     

Susceptibility of Lung Cancer with Polymorphisms of CYP1A1, GSTM1, GSTM3, GSTT1 and GSTP1 Genotypes in the Population of Inner Mongolia Region

Background: To study the relationship of susceptibility to lung cancer with the gene polymorphisms of CYP1A1, GSTM1, GSTM3, GSTT1, GSTP1 and smoking status in Han and Mongolian populations of Inner Mongolia, an autonomous region of China. Materials and Methods: PCR-RFLP, allele-specific and multiplexPCR were employed to identify the genotypes of CYP1A1, GSTM1, GSTM3, GSTT1 and GSTP1 in a case-control study of 322 lung cancer patients diagnosed by bronchoscopy and 456 controls free of malignancy. Results: There is a significant difference in genotypic frequency of GSTT1 of healthy Mongolian and Han subjects. A statistically prominent association was found between CYP1A1 Msp1 (vt/vt) (OR=4.055, 95%CI:2.107-7.578, p=0.000), GSTM1 (-) (OR=2.290, 95%CI:1.467-3.573, p=0.000) and lung cancer in Mongolians. Similarly, in the Han population, CYP1A1 Msp1 (vt/vt) (OR=3.194, 95%CI:1.893-5.390, p=0.000) and GSTM1 (-) (OR=1.884, 95%CI:1.284-2.762, p=0.001) carriers also had an elevated risk of lung cancer. The smokers were more susceptibleto lung cancer 2.144 fold and 1.631 fold than non-smokers in Mongolian and Han populations, respectively. The mokers who carried with CYP1A1 Msp1 (wt/vt+vt/vt), exon7 (Val/Val+Ile /Val), GSTM1 (-), GSTM3 (AB+BB),and GSTT1 (-) respectively were found all to have a high risk of lung cancer. Conclusions: CYP1A1 Msp1 (vt/vt) and GSTM1 (-) are risk factors of lung cancer in Han and Mongolian population in the Inner Mongolia egion. The smokers with CYP1A1 Msp1 (wt/vt+vt/vt), CYP1A1 exon7 (Val/Val+Ile /Val), GSTM1 (-), GSTM3(AB+BB), and GSTT1 (-) genotypes, respectively, are at elevated risk of lung cancer.     

GSTM1基因多态性与鼻咽癌遗传易感性的关系研究

目的　探讨谷胱甘肽S转移酶M 1(GSTM 1)基因多态性与鼻咽癌 (NPC )遗传易感性的关系。方法　采用内参照PCR法检测 80例NPC患者的GSTM 1基因型。结果　NPC患者GSTM 1空白基因型频率为 60 .0 % ,对照组为 45 .0 % ,两者有显著性差异 (P <0 .0 5 ) ,其OR =1.83 3 ( 95 %CI =1.0 46～ 3 .14 7) ;鳞癌的空白基因型频率为 60 .5 % ,明显高于腺癌的 5 0 .0 % (P <0 .0 1) ;吸烟者空白基因型个体患鼻咽癌的危险性显著增加 [OR =2 .813 ( 1.3 5 8～ 6.0 12 ) ,P <0 .0 1] ,而不吸烟者的危险性增加不明显 (P >0 .0 5 )。结论　GSTM 1基因多态性与NPC患者的遗传易感性有关 ,与NPC的病理类型有关 ,吸烟者的GSTM 1空白基因型个体更易患NPC。     

细胞色素P4502E1基因多态与贲门癌易感性关系探讨

 目的　探讨细胞色素P4 5 0 2E1(CYP2E1)基因多态与贲门癌易感性的关系。方法　采用病例对照研究方法和聚合酶链反应 限制性片段长度多态性 (PCR RFLP)检测技术 ,对 15 9例贲门癌患者和 192例对照的CYP2E1基因多态性进行分析。结果　CYP2E13种基因型在贲门癌病例组和对照组的分布差异有显著性 (χ2 =16 .0 4 ,P <0 .0 1) ,比值OR为 2 .37(95 %CI :1.5 2～ 3.70 )。贲门癌病例组CYP2E1(c1/c1)基因型频率为 6 0 .4 % ,对照组为 4 0 .1%。吸烟且携带CYP2E1(c1/c1)基因型的个体与携带CYP2E1(c1/c2或c2 /c2 )基因型的不吸烟者相比 ,患贲门癌的OR为 4 .6 8(95 %CI:2 .19～ 10 .0 4 )。结论CYP2E1基因多态性与贲门癌易感性有关 ,与吸烟协同作用使贲门癌的危险显著增加     

CYP1A1与GSTM1的多态性与原发性肝癌遗传易感性的关系研究

目的 :探讨细胞色素P4 5 0 1A1(cytochromeP4 5 0 1A1,CYP1A1)与谷胱苷肽S -转移酶M1(glu tathioneS transferaseM 1,GSTM 1)的多态性与原发性肝癌遗传易感性的关系。方法 :应用等位特异PCR和多重PCR技术对 5 2例原发性肝癌患者和 10 0名健康对照的CYP1A1和GSTM 1多态性进行分析。结果 :肝癌患者CYP1A1第 7外显子 4 62Val的等位变异频率为 0 .4 6,显著高于正常对照的变异频率(0 .2 2 ) ,病例组GSTM1的纯合型缺失频率 (0 .65 )也显著高于对照组 (0 .4 1) ,携带有CYP1A1Val/Val纯合变异和GSTM1纯合缺失基因型的人患肝癌的风险大大增加 ,前者的比值比 (oddsratio ,OR)及 95 %可信区间 (confidenceinterval,95 %CI)为 4 .13(1.2 8～ 13.35 ) ,后者的OR值及 95 %CI为 2 .72 (1.35～5 .4 6) ,二者联合OR值及 95 %CI为 8.5 0 (1.74～ 4 1.5 0 )。结论 :CYP1A1和GSTM 1的多态是原发性肝癌的遗传易感因素 ,二者的等位变异增加了患肝癌的风险