Association of genetic polymorphisms of GSTM1 and smoking status with lung cancer risk

Objective Long-term cigarette smoke exposure damages the airway epithelium.However,the correlation among GSTM1 gene polymorphism,smoking status,and lung cancer susceptibility remains unclear.This study aimed to identify the genetic polymorphism of GSTM1 and examine the association of GSTM1 polymorphism and smoking history with lung cancer susceptibility.Methods The genetic polymorphism of GSTM1 was genotyped by polymerase chain reaction(PCR) in 217 lung cancer patients and 198 controls.The demographic data and smoking history of the patients were collected.The age,sex,and residence of the two groups were also obtained.Results Significant differences in GSTM1 polymorphism were observed between the case and control groups(P=0.024).Smoking time and smoking index were significantly different between the case and control groups.With the increase in smoking time and smoking index,the differences became more obvious.There was a synergistic effect between GSTM1 and smoking(S=3.35).The risk of developing lung cancer increased 4.82 fold in smokers carrying deficient-type GSTM1.Compared with patients carrying wild-type GSTM1,the risk of developing lung cancer was higher in those carrying deficient-type GSTM1 with the increase in smoking time and smoking index.In different pathological types,no significant differences were observed in GSTM1 polymorphism.In different pathological types,the proportions of patients increased with the increase in smoking time and smoking index,especially the proportion of patients with squamous cell carcinoma.Compared with wild-type GSTM1,the proportion of patients with deficient-type GSTM1 increased with the increase in smoking time and smoking index(P=0.003 and 0.017).This trend was mainly observed in those with squamous cell carcinoma.Conclusion GSTM1 mutation is associated with lung cancer susceptibility.Smokers carrying deficienttype GSTM1 are more likely to develop lung cancer.Compared with patients carrying wild-type GSTM1,smokers with deficient-type GSTM1 are more likely develop lung cancer when smoking time is more than 30 years and smoking index is more than 400.In patients carrying deficient-type GSTM1,the risk of developing squamous cell carcinoma increases with an increase in smoking time and smoking dose.

The Association between RASSF1 Gene Polymorphisms and Lung Cancer Susceptibility among People in Hubei Province of China

The relationship between Ala/Ser polymorphism in 133 codon of exon 3 region of the RASSF1 gene and genetic susceptibility of lung cancer in Hubei province Han population was investigated by a case-control study. Polymerase chain reaction-restriction fragment length polymorphism （PCR-RFLP） technique was adopted to analyze the polymorphism of codon 133 of exon 3 in the RASSF1 gene of 100 pathologically diagnosed lung cancer patients, and 100 healthy controls. The relationship between different genotypes and the susceptibility of lung cancer was analyzed. Among 200 blood samples from Han people in Hubei Province, including 100 from lung cancer patients and 100 from healthy controls, the frequencies of Ala/Ala, Ala/Ser, Ser/Ser genotype of the RASSF1 in lung cancer patients were 83%, 16%, 1%, and those in healthy controls was 93%, 7%, 0% respectively, with the difference being statistically significant between two groups （P〈0.05）. The individuals with Ala/Ser genotype had higher risk of suffering from lung cancer, with an OR of 2.341, and 95% CI of 1.009-6.393 respectively. It was concluded that RASSF1Ala133Ser was a susceptible genetic factor of lung cancer. Ala/Ser genotype increased the risk of lung cancer.

Joint effect among p53, CYP1A1, GSTM1 polymorphism combinations and smoking on prostate cancer risk： an exploratory genotype-environment interaction study

Aim： To assess the role of several genetic factors in combination with an environmental factor as modulators of prostate cancer risk. We focus on allele variants of low-penetrance genes associated with cell control, the detoxification processes and smoking. Methods： In a case-control study we compared people carrying p53cd72 Pro allele, CYP1A1 M1 allele and GSTM1 null genotypes with their prostate cancer risk. Results： The joint risk for smokers carrying Pro^＊ and MI^＊, Pro^＊ and GSTM1null or GSTM1 null and CYP1A1 MI^＊ variants was significantly higher （odds ratio [OR]： 13.13, 95% confidence interval [CI]： 2.41-71.36; OR： 3.97, 95% CI： 1.13-13.95 and OR： 6.87, 95% CI： 1.68-27.97, respectively） compared with that for the reference group, and for non-smokers was not significant. OR for combinations among p53cd72, GSTM1 and CYP1A1 M1 in smokers were positively and significantly associated with prostate cancer risk compared with non-smokers and compared with the putative lowest risk group （OR： 8.87, 95% CI： 1.25-62.71）. Conclusion： Our results suggest that a combination of p53cd72, CYP1A1, GSTM1 alleles and smoking plays a significant role in modified prostate cancer risk on the study population, which means that smokers carrying susceptible genotypes might have a significantly higher risk than those carrying non-susceptible genotypes.

CYP2E1、GSTM1基因多态性与肺癌、食管癌易感性研究

研究细胞色素 P45 0 2 E1基因 (CYP2 E1)、谷胱甘肽转硫酶 M1(GSTM1)基因多态性与肺癌及食管癌易感性的关系 ,应用 PCR- RFL P技术对 12 0例肺癌、 98例食管癌进行病例对照研究。发现肺癌组 GSTM1null基因型频率(6 1.7%)高于正常对照组 (4 4.2 %) (χ2 =7.38,P<0 .0 1) ,食管癌组该基因型频率 (6 8.4%)亦高于正常对照组 (4 2 .9%)(χ2 =12 .92 ,P<0 .0 0 5 ) ,携带 GSTM1null基因型个体患肺癌和食管癌的危险性分别是非 GSTM1null基因型个体的 2倍和 3倍。CYP2 E1Rsa I多态性分析研究表明 ,突变基因型 (杂合子 +突变纯合子 )频率肺癌组 (35 %)和食管癌组(2 6 .5 %)均分别低于正常对照组 (5 2 .5 %和 5 5 .1%,P<0 .0 1)。携带 CYP2 E1野生基因型个体发生肺癌和食管癌的危险性分别是携带 CYP2 E1突变基因型个体的 2倍和 3.5倍。认为 GSTM1和 CYP2 E1Rsa I多态性均是个体肺癌和食管癌的重要易感因素。

CYP1A1、GSTM1基因多态性与肺癌易感性的研究

目的:探讨CYP1A1、GSTM1基因多态性与肺癌易感性之间的相关性。方法:利用RFLP-PCR(限制性片段长度多态性-聚合酶链反应)方法检测65例原发性肺癌和60例非肿瘤患者CYP1A1、GSTM1基因,再用NcoI及HinfI两种内切酶识别CYP1A1等位基因亚型。结果:1)肺癌组与对照组CYP1A1等位基因型Ile/Ile、Ile/Val、Val/Val的频率总体分布无显著性差异;但肺癌组CYP1A1(Val/Val)基因型频率(18.5%)明显高于对照组(8.3%),两组差异有显著性(P<0.05)。2)肺癌组GSTM1(-)基因型的频率(63.1%)明显高于对照组(45.0%),P<0.05。3)两种等位基因联合分析发现,与携带CYP1A1(Ile/Ile)/GSTM1(+)基因型的个体相比:CYP1A1(Ile/Ile)/GSTM1(-)以及CYP1A1(Ile/Val+Val/Val)/GSTM1(+)基因型个体患肺癌的风险度较高,OR分别为3.82(95.0%CI,1.27～11.45)和3.5(95.0%CI,1.18～10.41);而CYP1A1(Val/Val)/GSTM1(-)基因型个体患肺癌的风险度最高,OR为10.5(95.0%CI,1.70～64.73)。4)进一步分层分析发现,CYP1A1(Ile/Val+Val/Val)等位基因型主要增加鳞癌的危险性;而GSTM1基因型组织类型无明显的相关性。5)在分析吸烟对肺癌易感性的影响时发现,CYP1A1(Ile/Val+Val/Val)及GSTM1(-)等位基因型与吸烟有协同作用,并与至发病时的累积吸烟量有关。

肺癌患者CYP1A1和GSTM1基因多态性检测

目的探讨CYP1A1与GSTM1基因多态与支气管肺癌癌变的关系。方法采用回顾性“病例-对照”方法和PCR-RFLP技术,对98例肺癌患者和136名体检健康者(对照组)进行CYP1A1与GSTM1基因多态性检测。结果对照组和肺癌组CYP1A1m1、GSTM1缺陷型等位基因频率分别为28%和43%、44%和61%,2组比较,差异有统计学意义(P<0.05)。CYP1A1(w1/m1)、CYP1A1(m1/m1)、GSTM1(缺陷型)基因型患肺癌的危险度分别升高3.18倍、2.72倍和2.16倍(P均<0.05)。GSTM1(缺陷型)和CYP1A1(w1/m1)或CYP1A1(m1/m1)基因型携带者患肺癌的危险度为5.62倍(P<0.01)。吸烟使GSTM1缺陷型携带者和CYP1A1m1携带者肺癌的患病危险度较单一基因作用危险度显著增加(P<0.05)。结论CYP1A1m1和GSTM1缺陷型基因均是肺癌的危险因素,2者存在交互作用,且均与吸烟有协同作用。

GSTM1基因多态性与川北地区肺癌易感性关系的研究

目的探讨谷胱苷肽硫转移酶M1（GSTM1）基因多态性与川北地区汉族人群肺癌易感性的关系。方法采用病例对照研究和聚合酶链式反应（PCR）技术检测川北地区125例肺癌患者（肺癌组）和125例非肿瘤患者（对照组）GSTM1基因缺失型的频率,评价其与肺癌易感性的关系。结果 GSTM1缺失基因型[GSTM1（-）]频率在肺癌组和对照组分别为58.4%和56.8%,差异无统计学意义（P=0.822）;GSTM1（-）基因型与肺鳞癌（OR=0.97,95%CI：0.52~1.83,P=0.934）和腺癌（OR=0.94,95%CI：0.42~2.04,P=0.844）风险亦无明确关系。结论 GSTM1各基因型与肺癌风险无明确关系。

高氡暴露地区人群中代谢酶GSTM1基因多态性与肺癌易感性关系的研究

本文采用病例-对照研究方法,以多重聚合酶链反应扩增技术,对高氡暴露地区53例肺癌患者和72例对照人员进行了代谢酶GSTM1基因多态性检测,并分析了不同人群中该基因多态性与肺癌发病风险的关系,以探讨高氡暴露地区人群中GSTM1基因多态性与肺癌易感性的关系。结果表明,GSTM1基因功能型和缺陷型在肺癌组分布分别是38.9%、64.1%,在对照组分布分别为43.1%、56.9%。GSTM1基因缺陷型的肺癌发病风险为1.35倍(95%可信限0.652～2.81),有效剂量<50mSv的人群中GSTM1基因缺陷型的肺癌发病风险是功能型的1.14倍(95%可信限0.198～6.60)。从以上结果可以看出,GSTM1基因功能型在肺癌组的分布频率低于对照组的分布频率,而缺陷型在肺癌组的分布频率高于对照组的分布频率;GSTM1基因缺陷型使肺癌的发病风险有增高的趋势,但未见显著性差异。

GSTM1基因多态与肺癌及肠癌易感性研究

目的:探讨广东汉人GSW1基因多态性与肺癌及大肠癌的易感性关系。方法:采用病例-对照研究方法,PCR检测GSTM1的基因型。结果:肠癌组GSTM1缺陷型为36.8％（n＝19）,肺癌组58.7％（n＝46）,对照组为35.7％（n＝70）。肠癌组与对照组GSTM1基因多态分布没有显著性差异（P＞0.05）,肺癌组有显著性差异（P＜0.05）。结论:GSTM1基因缺陷是肺癌易感性因素。

谷胱甘肽硫转移酶Mul-1(GSTM1)基因多态性与肺癌易感性关系的研究

目的 探讨中国汉族广东人群中谷胱甘肽硫转移酶 Mul- 1(GSTM1)基因缺失及吸烟与肺癌易感性的关系。 方法 采用病例 -对照研究方法 ,应用 PCR技术检测 91例肺癌患者、138例对照的 GSTM1基因多态性。 结果 GSTM1基因缺失在肺癌组和对照组中的频率分别为 6 1.5 %和 5 2 .9% ,OR=1.38(0 .80～ 2 .38)差异无统计学意义 (P>0 .0 5 ) ,与吸烟联合分析时发现 GSTM1基因缺失的 OR值为 3.0 7,比单纯吸烟对肺癌的 OR值 (1.87)大 (P<0 .0 1)。 结论

GSTM1和CYP2E1基因多态性与非小细胞肺癌遗传易感性的相关性研究

目的探讨细胞色素p4502E1基因(CYP2EI)和谷胱甘肽转硫酶MI(GSTM1)基因多态性与深圳地区非小细胞肺癌遗传易感性的相关性。方法收集2014年2月~2016年10月在深圳各医院就诊并确诊为非小细胞肺癌患者和同期住院的肺良性疾病患者各71例,采用PCR-RFLP和PCR法分别检测CYP2E1基因的RsaⅠ/PstⅠ和GSTM1基因多态性,并分析基因多态性与非小细胞肺癌遗传易感性之间的相关性。结果非小细胞肺癌组和肺良性疾病组患者CYP2E1基因Rsa I/Pst I多态性的三种基因型检出频率差异无统计学意义(χ~2=0.891~1.205,P>0.05);非小细胞肺癌组GSTM1(–)基因型频率为61.79%,显著高于肺良性疾病组的36.62%,两者频率的差异有统计学意义(χ~2=5.019,P<0.05);携带GSTM1(–)基因型的个体患非小细胞肺癌的危险性显著高于GSTM1(+)基因型的个体(OR=2.095,95%CI=1.104~3.173,P=0.032);与携带cl/c2或c2/c2基因型的不吸烟个体比较,携带cl/cl基因型的吸烟者患非小细胞肺癌的风险显著增加(OR=3.415,95%CI=1.092~11.214,P=0.028);携带cl/cl和GSTM1(–)基因型的个体患非小细胞肺癌的风险显著高于携带GSTM1(+)和cl/c2或c2/c2基因型的个体(OR=3.518,95%CI=1.106~l2.812,P=0.045)。在不吸烟人群中,携带GSTM1(–)和cl/cl基因型的人群患非小细胞肺癌的风险显著高于携带GSTM1(+)和cl/c2或c2/c2基因型的人群(OR=2.917,95%CI=1.004~8.316,P=0.043),且携带有GSTM1(–)和cl/c2或c2/c2基因型的人群患非小细胞肺癌的风险同样高于携带GSTM1(+)和cl/c2或c2/c2基因型的人群(OR=14.062,95%CI=1.362~147.256,P=0.029)。结论 GSTM1(–)基因型是深圳地区人群患非小细胞性肺癌的风险因素之一;同时携带CYP2E1的cl/cl和GSTM1(–)基因型可增加吸烟和不吸烟人群患非小细胞肺癌的风险。

Relationship between XRCC1 polymorphisms and susceptibility to prostate cancer in men from Han, Southern China

Aim： To investigate the association among XRCC1 polymorphisms, smoking, drinking and the risk of prostate cancer （PCa） in men from Han, Southern China. Methods： In a case-control study of 207 patients with PCa and 235 cancerfree controls, frequency-matched by age, we genotyped three XRCC1 polymorphisms （codons 194, 280 and 399） using the polymerase chain reaction-restriction fragment length polymorphism （PCR-RELP） method. Results： Among the three polymorphisms, we found that the XRCC1 Arg399Gln variant allele was associated with increased PCa risk （adjusted odd ratio [OR]： 1.67, 95% confident interval [CI]： 1.11-2.51）, but the XRCC1 Arg 194Trp variant allele had a 38% reduction in risk of PCa （adjusted OR： 0.62, 95% CI： 0.41-0.93）. However, there was no significant risk of PCa associated with Arg280His polymorphism. When we evaluated the three polymorphisms together, we found that the individuals with 194Arg/Arg wild-type genotype, Arg280His and Arg399Gln variant genotypes had a significantly higher risk of PCa （adjusted OR： 4.31; 95% CI： 1.24-14.99） than those with three wild-type genotypes. In addition, we found that Arg399Gln variant genotypes had a significant risk of PCa among heavy smokers （adjusted OR： 2.04; 95% CI： 1.03-4.05）. Conclusion： These results suggest that polymorphisms of XRCC1 appear to influence the risk of PCa and may modify risks attributable to environmental exposure.

Cytochrome P450 2E1 RsaI/PstI and DraI Polymorphisms Are Risk Factors for Lung Cancer in Mongolian and Han Population in Inner Mongolia

Objective： To explore the relationship between cytochrome P450 2E1 （CYP2E1） RsaI/PstI and DraI polymorphism and lung cancer susceptibility in Mongolian and Han population in Inner Mongolia of China. Methods： CYP2E1 RsaI/PstI and DraI polymorphisms were detected by polymerase chain reaction-restriction fragment length polymorphism in 64 lung cancer patients, 150 healthy Mongolian and 150 healthy Han individuals. The distribution of genotype and allele frequencies of CYP2E1 RsaI/PstI and DraI polymorphisms were studied. Results： The risk of lung cancer was increased in individuals with CYP2E1 （cl/cl） and CYP2E1 （DD） with OR values of 2.431 （95%CI=1.082-5.460） and 2.778 （95%CI=1.358-5.683） respectively （P0.05）. When CYP2E1 RsaI/PstI and DraI polymorphisms were combined, the risk of lung cancer was reduced in individuals with CYP2E1 （cl/c2＋c2/c2 and DD＋CC） with OR values of 0.233 （95%CI=0.088-0.615, P0.05）. In smokers, the susceptibility to lung cancer was higher in the individuals with CYP2E1 （c1/c1） and CYP2E1 （DD） than in the individuals with c2 and C allele （P0.05, OR=2.643 and 4.308 respectively）. There was no significant difference in distribution of CYP2E1 genotype frequency between healthy Mongolian, Han population and lung cancer patients, healthy controls in Inner Mongolia. Conclusion： CYP2E1 （c1/c1） and CYP2E1 （DD） are predisposing factors of lung cancer in population in Inner Mongolia. CYP2E1 （c2﹢C） co-mutation may decrease the risk of lung cancer. Smoking exerts synergetic effect with CYP2E1 （c1/c1） and CYP2E1 （DD） on the occurrence of lung cancer.

Polymorphism of the DNA repair gene XPA and susceptibility to lung cancer

Objective： To study the relationship between one polymorphism in the promoter of the DNA repair gene XPA and the susceptibility to lung cancer. Methods： Genotypes were determined by the PCR-restriction fragment length polymorphism （PCR-RFLP） method in 310 histologically-confirmed lung cancer cases and 341 age and sex frequency-matched cancer-free controls. Results： The XPA A23G genotype frequencies were 27.1% （AA）, 42.9% （AG）, and 30.0% （GG） in case patients and21.1% （AA）, 5218% （AG）, and 26.1% （C-G） in control subjects. Multivariate logistic regression analysis revealed that individuals carrying at least one 23G variant allele （AG ＋ GG genotypes） had a significantly decreased risk for lung cancer （adjusted OR = 0.66; 95 % CI = 0.44- 0.98） compared with the wild-type genotype （23AA）. Stratified analysis showed that the protective effect was more evident in subjects with a family history of cancer. Conclusion： These results suggest that the XPA A23G polymorphism may have a role in lung cancer susceptibility in this study population.

肿瘤易感基因CYP4501A1和GSTm1多态性与高氡暴露地区居民肺癌关系研究

目的 研究高氡暴露地区居民肺癌易感基因CYP4501A1和GSTm1多态性的变化规律，探讨这2种基因多态性与肺癌及环境因素之间的关系。方法 按病例一对照的研究方法从甘肃省庆阳地区选择原发性肺癌病例和相匹配的对照人群进行室内氡、钍射气的测量，并应用PCR—RFLP和PCR方法检测2种基因的多态性。结果研究表明，携带杂合型CYP1A1（w/m）或缺失型GSTm1（-）基因与野生型基因的个体比较，肺癌发病风险分别为1.46倍（95％Cl为0．72～2、95）和1.28倍（95％Cl为0.67～2.41）。同时携带两种突变基因型的个体，肺癌发病风险为2、00倍（95％Cl为0．72～5．58），重度吸烟者肺癌的发病风险会增至2、14倍（95％Cl为0.35～13．12）。居住在室内氡、钍射气累积有效剂量50～100mSv并携带突变型CYP1A1（w／m）或GSTm1（-）基因的个体患肺癌的风险分别为2.63倍（95％Cl为0．21～31．34）和3．50倍（95％cl为0.31～39.12）。有肿瘤家族史的人群肺癌发病风险是3．75倍（95％cl为1.51～9.29），差异有统计学意义。结论 杂合型CYP1A1（w／m）和突变型GSTml（-）基因是较重要的肺癌风险因子，尤其在有效剂量50～100mSv和2种突变基因的协同作用时。

Excision repair cross complementation group 1 polymorphisms and lung cancer risk： a meta-analysis

Background Several studies have evaluated the association between polymorphisms of encoding excision repair cross complementation group 1 （ERCC1） enzyme and lung cancer risk in diverse populations but with conflicting results.By pooling the relatively small samples in each study, it is possible to perform a meta-analysis of the evidence by rigorous methods.Methods Embase, Ovid, Medline and Chinese National Knowledge Infrastructure were searched. Additional studies were identified from references in original studies or review articles. Articles meeting the inclusion criteria were reviewed systematically, and the reported data were aggregated using the statistical techniques of meta-analysis.Results We found 3810 cases with lung cancer and 4332 controls from seven eligible studies. T19007C polymorphism showed no significant effect on lung cancer risk （C allele vs. T allele： odds ratio （OR）=0.91, 95% confidence interval （CI）=0.80-1.04; CC vs. TT： OR=0.76, 95% CI=0.56-1.02; CC vs. （CT＋TT）： OR=0.96, 95% CI=-0.84-1.10）. Similarly,there was no significant main effects for T19007C polymorphism on lung cancer risk when stratified analyses by ethnicity （Chinese or Caucasian）. No significant association was found between C8092A polymorphism （3060 patients and 2729 controls） and the risk of lung cancer （A allele vs. C allele： OR=1.03, 95% CI=0.95-1.11; AA vs. CC： OR=1.08, 95% CI=-0.88-1.33; AA vs. （AC＋CC）： OR=1.08, 95% CI=-0.88-1.31）.Conclusion We found little evidence of an association between the T1900C or C8092A polymorphisms of ERCC 1 and the risk of lung cancer in Caucasian or Han Chinese people.

中国人细胞色素P450IA1基因变异与吸烟相关性肺癌的风险

目的：探讨多环芳烃类致癌物代谢酶细胞色素Ｐ４５０ＩＡ１ 基因（ＣＹＰ１Ａ１） 多型性与中国人肺癌易感性的关系。方法：应用ＰＣＲＲＦＬＰ 方法，分析１５０ 例原发性肺癌和３９１ 例正常对照者ＣＹＰ１Ａ１ 基因的ｍ １、ｍ２ 和ｍ ４ 位点突变。以比值比（ＯＲ） 及其９５ ％ 可信区限（ＣＩ） 比较不同基因型与肺癌风险的关系，以及与吸烟的交互作用。结果：位于３＇端ＭｓｐＩ识别的位点（ ｍ１） 和位于第７ 外显子ＢｓｒＤＩ 识别的位点（ｍ２） 具多态性，而位于第７ 外显子由ＢｓａＩ识别的位点（ｍ ４） 未见有变异。ｍ１ 变异型等位频率在对照组中为０－３６，而在肺癌病例组中为０－４６ 。携带至少一个变异基因拷贝者发生肺癌的风险比携带野生基因型者高２ 倍（ＯＲ ２－３ ；９５％ ＣＩ１－９～２－９） 。分层分析发现，肺鳞癌患者中ｍ １ 变异基因型频率更高（０－４８） ，携带此种基因型者发生肺鳞癌的相对风险（ＯＲ） 为３－０（９５％ ＣＩ２－２ ～４－０） 。ｍ２ 变异与ｍ１变异密切关联，符合率达７６ ％ 。携带至少一个ｍ ２ 变异基因拷贝者的ＯＲ 为１－９ （９５％ ＣＩ１－６ ～２－４） 。此外，ＣＹＰ１Ａ１ｍ１ 变异与吸烟有明显的交互作用。

南京市人群DNA修复基因XRCC1多态性与肺癌易感性的关系

[目的]研究碱基切除修复基因XRCC1多态性与南京市人群肺癌易感性的关系。[方法]采用配对病例_对照研究 ,收集南京籍原发性肺癌患者104例为病例组 ,同时按1:1配对选择非肿瘤、非呼吸道疾病患者104例为对照组 ,并进行流行病学调查。应用PCR_RFLP方法分析了病例组和对照组的XRCC1基因Arg194Trp和Arg399Gln两个位点的多态性 ,比较不同基因型与肺癌易感性的关系 ,以及基因多态性与吸烟之间对肺癌易感性的交互作用。[结果]携带399Gln等位基因的个体其肺癌危险性增高 (OR=1.790 ,95 %CI=1.033～3.103 ,P=0.038) ,且主要增加患鳞癌的危险 (OR=2.426 ,95 %CI=1.123～5.237,P=0.023);并与吸烟指数≥20的有一定的协同作用 (OR=2.536 ,95 %CI=1.043～6.165)。Arg194Trp与肺癌危险性之间未见显著性相关 (OR=1.040 ,95%CI=0.600～1.805)。[结论]碱基切除修复基因XRCC1的多态性可能会对肺癌易感性产生影响 。

髓过氧化物酶基因多态性与肺癌遗传易感性的研究

背景与目的:髓过氧化物酶(myeloperoxidase,MPO)基因启动子区域-463bp处存在G/A多态位点,国外研究表明此位点与肺癌遗传易感性有关,但中国人MPO基因型与肺癌易感性关系尚未见报道,本研究拟对此问题作一探讨。方法:采用病例-对照分子流行病学方法,以PCR-RFLP技术检测98例原发性肺癌和112名健康对照MPO基因型,通过比较不同基因型者的比值比(oddsratio,OR)及其95%可信区间(confidenceinterval,CI)分析基因多态性与中国人肺癌易感性的关系。结果:正常人群G/G、G/A、A/A基因型频率分别为47.3%、42.9%和9.8%,肺癌病例组分别为63.3%、33.7%和3.0%,杂合子G/A在两组人群中分布无显著性差异(P>0.05),但病例组A/A基因型频率显著低于对照组(P<0.025)。携带至少一个等位基因A者患肺癌的风险是基因型为G/G者的52.0%(95%CI0.29～0.93)。在吸烟人群中,等位基因A对肺癌易感性的保护作用有显著性意义(OR=0.41,P<0.025),而在非吸烟人群,这种保护作用无显著性意义(P>0.25)。结论:本研究人群MPO基因多态与肺癌遗传易感性相关,等位基因A对吸烟人群的肺癌易感性有保护作用。

CYP2E1基因多态性与肺癌遗传易感性的关系

目的研究CYP2E1基因多态性与中国四川汉族人群肺癌遗传易感性之间的相关性。方法应用PCR-RFLP技术检测150例中国四川汉族肺癌患者和152例健康人的CYP2E1基因RsaⅠ／PstⅠ和DraⅠ多态性的分布频率，并分析了这两种基因多态性与中国四川汉族人群肺癌遗传易感性之间的相关性，以及与吸烟在肺癌易感性中的交互作用。结果①CYP2E1基因RsaⅠ／PstⅠ和DraⅠ多态基因型分布频率在2组间比较无显著性差异（分别为Х^2=3．186，P=0．203和Х^2=1．756，P=0．416）；②按照吸烟因素分层，携带c1／c1基因型的不吸烟个体较携带突变基因型的个体肺癌风险显著增加（OR=2．453，95％CI=1．140～5．276，P=0.022）；③与携带至少1个突变c2基因型的个体比较，携带c1／c1基因型的个体患肺腺癌的风险显著增加（OR=2．440，95％CI=1．235～4．820，P=0．01）；④没有发现DraⅠ多态性与肺癌风险之间的相关性。结论①CYP2E1的c1／c1基因型为中国四川汉族人群肺癌易感基因型；②RsaⅠ／PstⅠ多态性与中国四川汉族人群患肺腺癌的风险显著相关；③DraⅠ多态性与中国四川汉族人群肺癌风险无相关性。