BER修复基因多态性与肺癌易感性的研究进展

碱基切除修复(base excision repair,BER)通路是DNA损伤修复的关键通路,通路中的8-羟基鸟嘌呤DNA糖苷酶基因(human 8-oxoguanine glycosylase,hOGG1),人类X线交叉互补修复基因(X-ray repair cross-complementing group 1,XRCC1),MutY homolog(MUTYH)基因的单核苷酸多态性影响BER通路中重要的酶和蛋白质的功能,导致修复障碍,最终引起癌症发生.DNA损伤修复基因单核苷酸多态性和肺癌易感性的研究结果尚存在争议,本文对近年来BER通路基因hOGG1Ser326Cys,XRCC1 Arg194Trp,XRCC1 Arg280His,XRCC1 Arg399Gln,XRCC1-77T>C和MUTYHHis324Gln多态性与肺癌易感性的关系的研究进行汇总,并探讨了多项研究对BER基因多态性与不同肺癌亚型的关系以及与吸烟之间关系.基因多态性与肺癌易感性关系受多因素影响,其相关性尚待进一步探索.     

BER修复基因多态性与肺癌易感性的研究进展

碱基切除修复(base excision repair,BER)通路是DNA损伤修复的关键通路,通路中的8-羟基鸟嘌呤DNA糖苷酶基因(human 8-oxoguanine glycosylase,hOGG1),人类X线交叉互补修复基因(X-ray repair cross-complementing group 1,XRCC1),MutY homolog(MUTYH)基因的单核苷酸多态性影响BER通路中重要的酶和蛋白质的功能,导致修复障碍,最终引起癌症发生.DNA损伤修复基因单核苷酸多态性和肺癌易感性的研究结果尚存在争议,本文对近年来BER通路基因hOGG1Ser326Cys,XRCC1 Arg194Trp,XRCC1 Arg280His,XRCC1 Arg399Gln,XRCC1-77T>C和MUTYHHis324Gln多态性与肺癌易感性的关系的研究进行汇总,并探讨了多项研究对BER基因多态性与不同肺癌亚型的关系以及与吸烟之间关系.基因多态性与肺癌易感性关系受多因素影响,其相关性尚待进一步探索.     

BER修复基因多态性与肺癌易感性的研究进展

碱基切除修复(base excision repair,BER)通路是DNA损伤修复的关键通路,通路中的8-羟基鸟嘌呤DNA糖苷酶基因(human 8-oxoguanine glycosylase,hOGG1),人类X线交叉互补修复基因(X-ray repair cross-complementing group 1,XRCC1),MutY homolog(MUTYH)基因的单核苷酸多态性影响BER通路中重要的酶和蛋白质的功能,导致修复障碍,最终引起癌症发生.DNA损伤修复基因单核苷酸多态性和肺癌易感性的研究结果尚存在争议,本文对近年来BER通路基因hOGG1Ser326Cys,XRCC1 Arg194Trp,XRCC1 Arg280His,XRCC1 Arg399Gln,XRCC1-77T>C和MUTYHHis324Gln多态性与肺癌易感性的关系的研究进行汇总,并探讨了多项研究对BER基因多态性与不同肺癌亚型的关系以及与吸烟之间关系.基因多态性与肺癌易感性关系受多因素影响,其相关性尚待进一步探索.     

DNA修复基因XRCC1-Arg399G1n多态位点与壮族甲状腺相关眼病的相关性分析

目的 探讨DNA修复基因XRCC1-Arg399Gln多态性与甲状腺相关眼病（TAO）的相关性。方法 用PCR-RFLP法检测182例TAO患者和182例健康对照者的XRCC1-Arg399Gln多态性。结果 TAO组和对照组的等位基因分布有差异, TAO组突变等位基因（A）频率高于健康对照组（P〈0.001）;与野生型(GG)相比,携带变异基因的个体（GA+AA）可增加TAO的发病风险（OR值为1.863,95%CI为1.228~2.826,P＜0.05）。对于TAO,携带变异基因或吸烟单一因素的OR值分别为1.343(95%CI 0.764~2.36)和2.0274(95%CI 1.121~3.667),但携带变异基因者如果吸烟,OR值则高达4.981(95%CI 2.697~9.1998)。结论 XRCC1Arg399G1n位点A等位基因（Gln）可能是TAO的易感基因,其多态与吸烟可能存在联合作用。     

XRCC1基因多态性与乳腺癌遗传易感性的Meta分析

目的综合评估XRCC1（X-Ray Repair Cross Complementing Protein 1,XRCC1）基因单核苷酸多态性与乳腺癌易感性的关系。方法以＂Breast cancer＂、＂Polymorphism＂、＂XRCC1＂、＂Arg399Gln＂、＂Arg194Trp＂、＂Arg280His＂以及＂-77T〉C＂等为主题词检索Pubmed等英文数据库,同时以＂乳腺癌＂及＂基因多态性＂等为主题词检索中文数据库,利用Stata10.0软件进行Meta分析。结果 XRCC1 Arg399Gln显著增加患乳腺癌风险,其纯合遗传模型（Gln/Gln vsArg/Arg）与隐性遗传模型Gln/Gln vs（Gln/Arg＋Arg/Arg）的相对危险度（Odds Ratio,OR）分别为1.12（95%CI=1.02-1.22）及1.12（95%CI=1.03-1.22）。此外,XRCC1-77T〉C亦显著增加了患乳腺癌风险,其纯合遗传模型C/C vs T/T与隐性遗传模型C/C vs（T/C＋T/T）的OR值分别为1.47（95%CI=1.00-2.17）及1.52（95%CI=1.06-2.18）。结论 XRCC1基因Arg399Gln位点Gln/Gln突变型以及-77T〉C位点C/C突变型均与乳腺癌发生相关。     

XRCC1基因多态性影响奥沙利铂对晚期胃癌患者化疗疗效敏感性的关系

目的:研究DNA修复酶X射线损伤交叉互补蛋白1(X-ray repair cross-complementary protein 1,XRCC1)基因Arg399Gln多态性与晚期胃癌对奥沙利铂化疗敏感性的关系.方法:确诊的晚期胃癌患者68例,接受以奥沙利铂为主的化疗方案化疗.采用PCR-连接酶反应技术检测XRCC1 Arg399Gln多态性.比较不同基因型患者与化疗疗效及疾病进展时间(TTP)的关系.结果:68例胃癌患者中,38例(55.9%)携带XRCC 1 399Arg/Arg基因型,24例(35.3%)携带Arg/Gln基因型,6例(8.8%)携带Gln/Gln基因型.68例病人化疗总有效率(CR+PR)为48.5%(33/68),其中Arg/Arg基因型患者化疗有效率显著高于Arg/Gln+Gln/Gln基因型患者(60.5% vs 33.3%,χ2=4.963,P=0.026).68例患者中位TTP为8.0个月,其中Arg/Arg基因型患者为10个月,Arg/Gln+Gln/Gln基因型患者7.5个月,两者比较差异有显著性(χ2=17.383,P＜0.001).结论:XRCC1 Arg399Gln基因可以在一定程度上判断晚期胃癌患者接受奥沙利铂化疗后的预后情况.     

CYP1B1基因多态性与子宫内膜异位症易感性的相关研究

目的 研究CYP1B1基因第2外显子119(G-T)、第3外显子432(C-G)多态性与子宫内膜异位症(endometriosis,Ems)易感性的关系.方法 采用等位基因特异性聚合酶链反应对55例Ems患者和45例对照组进行CYP1B1基因第2外显子119(G-T)、第3外显子432(C-G)突变分析,探讨Ems的发生与CYP1B1基因多态性之间的相关性.结果 CYP1B1基因密码子119中等位基因G、T在Ems组和对照组分布的差异有统计学意义(P＜0.05),其中等位基因T使Ems发病风险提高2.061倍;CYP1B1基因密码子119G/T各基因型分布两组间差异有统计学意义(P＜0.05),纯合突变(T/T)基因型、杂合突变(G/T)基因型与野生型(G/G)基因型相比,患Ems的危险度分别为2.625倍和3.214倍.以CYP1B1联合野生型GG和CC个体的OR值为1相比,CYP1B基因密码子119杂合型突变(Ala/Ser)合并密码子432野生型个体的OR值为2.976,95%CI:1.129～7.848,P＜0.05.结论 CYP1B1基因第2外显子119(G-T)突变等位基因与Ems的发生有一定关系,突变基因型增加了Ems的发病风险;CYP1B1基因第2外显子杂合型突变(Ala/Ser)联合密码子432野生型能增加Ems的发病风险.     

hOGG1基因Ser326Cys位点多态性与糖尿病患者冠脉病变关系的研究

目的:了解糖尿病患者h OGG1基因Ser326Cys位点多态性与冠脉病变之间的关系。方法:入选行冠状动脉造影术的糖尿病患者共323例,应用聚合酶链式反应-限制性片段长度多态性(PCR-RFLP)技术检测每位患者的h OGG1基因Ser326Cys位点多态性。同时检测患者血糖、血脂、肾功能等生化指标。根据患者h OGG1基因Ser326Cys多态性分为3组:Cys/Cys基因型(85例)、Ser/Ser基因型(121例)和Ser/Cys基因型(117例)。由2名心血管医师对冠脉造影图像进行分析,按评判标准统计冠脉病变支数、病变复杂程度、Gensini评分和SYNTAX评分。分析h OGG1基因Ser326Cys多态性对h OGG1 mRNA表达和血8-OHd G水平的影响,以及对冠脉病变产生的影响。结果:(1)Cys/Cys基因型、Ser/Ser基因型和Ser/Cys基因型血8-OHd G水平差异显著(P0.05)。组间两两比较,Cys/Cys基因型高于Ser/Ser基因型和Ser/Cys基因型,差异有统计学意义(P0.05);而Ser/Ser基因型与Ser/Cys基因型比较,差异不显著(P0.05)。(2)Cys/Cys基因型h OGG1 mRNA的表达低于Ser/Ser基因型和Ser/Cys基因型(P0.05)。而Ser/Ser基因型与Ser/Cys基因型比较,h OGG1 mRNA表达差异不显著(P0.05)。(3)Cys/Cys基因组出现3支病变的概率为37.6%,Ser/Cys基因型出现冠脉1支病变的概率为35.9%,但3组病变支数概率的差异均不显著(P0.05)。(4)Cys/Cys基因型的Gensini和SYNTAX评分分别为48.7±15.3和39.5±17.2,冠脉复杂病变概率为73.0%,均高于Ser/Ser基因型和Ser/Cys基因型,差异显著(P0.05)。而Ser/Ser基因型和Ser/Cys基因型之间比较,差异均无统计学意义(P0.05)。结论:h OGG1基因Ser326Cys位点多态性与糖尿病患者冠脉病变有关,其中Cys/Cys基因型与病变严重程度有一定关系,其机制可能是Cys/Cys基因型的h OGG1表达水平下降,识别和切除DNA双链中的8-OHd G能力降低,修复DNA氧化损伤的能力下降,从而加速动脉粥样硬化的发生、发展。     

CYP1A1、CYP2D6基因多态性对白血病发生的影响

目的 分析细胞色素P450 CYP1A1和CYP2D6的多态性基因型在湖南地区白血病患者和健康人群中的分布及其对白血病发生的影响.方法 采用PCR及PCR-RFLP技术分析多态性基因型频率.结果 CYP1A1和CYP2D6基因的野生型、杂合突变型及纯合突变型的分布频率在急性淋巴细胞性白血病、急性非淋巴细胞性白血病、慢性粒细胞性白血病患者组与健康对照组之间无显著性差异;携带一个突变等位基因型的个体患白血病的风险与相应野生型携带者比较均无显著性差异;急性非淋巴细胞性白血病患者组的CYP1A1杂合突变型与CYP2D6杂合突变型的联合基因型频率高于健康对照组.结论 单独的CYP1A1或CYP2D6基因的多态性变异与白血病易感性不相关;CYP1A1杂合突变与CYP2D6杂合突变的联合基因型增加患急性非淋巴细胞性白血病的风险.     

ERCC2/XPD和XRCC1基因多态性与鼻咽癌放化疗患者临床转归的相关性研究

目的探讨D组着色性干皮病偶联因子(XPD)的核苷酸切除修复交叉互补基因2(ERCC2/XPD) Lys751Gln和XRCC1 Arg194Trp基因多态性与鼻咽癌(NPC)患者放化疗敏感性及预后相关性。方法选择2015年1月至2016年12月在海南医学院第一附属医院首次接受治疗的NPC患者128例,其中男性82例,女性46例;年龄35～77岁,平均年龄56.28岁。根据放化疗是否敏感分为敏感组和不敏感组。记录所有患者临床资料。采用聚合酶链反应(PCR)检测2组患者ERCC2/XPD Lys751Gln和XRCC1 Arg194Trp基因多态性,采用Hardy-Weinberg遗传平衡吻合度检验法计算各基因型的理论值。Logistic回归分析影响NPC放化疗敏感性的因素,Kaplan-Meier分析不同基因型组间总生存期(OS)的差异。结果敏感组72例,不敏感组56例。敏感组与不敏感组性别、年龄、吸烟习惯、Karnofsky(KPS)评分、化疗方式、T分期比较,差异无统计学意义(P 0.05),两组患者N分期、美国癌症联合委员会(AJCC)分期、分化程度、淋巴结转移比例、放疗前肿瘤靶区体积(GTVnx)及淋巴结靶区体积(GTVnd)差异有统计学意义(P 0.05);两组间ERCC2/XPD Lys751Gln和XRCC1 Arg194Trp的3种基因型均符合Hardy-Weinberg遗传平衡定律(P 0.05);两组患者ERCC2/XPD Lys751Gln基因和XRCC1 Arg194Trp基因的不同基因型分布比较,差异有统计学意义(P 0.05);多因素Logistic回归分析显示,N分期N2+N3期、放疗前GTVnx、放疗前GTVnd、淋巴结转移及ERCC2/XPD Lys751Gln的携带Gln基因型和XRCC1Arg194Trp的携带Trp基因型是影响NPC患者放化疗的独立危险因素;携带ERCC2/XPD Lys751Gln基因Gln等位基因患者3年OS为60.00%,不携带Gln等位基因患者3年OS为79.17%,两者差异具有统计学意义(P 0.05);携带XRCC1 Arg194Trp基因Trp等位基因患者3年OS为58.14%,不携带Trp等位基因患者3年OS为73.81%,两者差异具有统计学意义(P 0.05)。结论 ERCC2/XPD Lys751Gln和XRCC1 Arg194Trp基因多态性与NPC患者放化疗敏感性有关,分别携带Gln、Trp等位基因是放化疗敏感性的危险因素,且患者OS明显降低。     

Single nucleotide polymorphisms in base-excision repair genes hOGG1, APE1 and XRCC1 do not alter risk of Alzheimer's disease

Alzheimer's disease (AD) is a progressive neurodegenerative disorder with a poorly understood etiology. There is considerable evidence that oxidative stress occurs in AD and increased DNA damage has been found in brain tissues and leukocytes of AD patients. Base excision repair (BER) is the major pathway responsible for removing oxidative DNA damage. Polymorphisms in DNA-repair genes have been associated with the increased risk of several age-related disorders including various types of cancer and could also be related to the etiology of AD. We conducted a case-control study including 91 patients with AD and age- and sex-matched 93 control subjects to examine the role of single nucleotide polymorphisms of BER genes, hOGG1 (Ser326Cys), APE1 (Asp148Glu) and XRCC1 (Arg280His and Arg399Gln) as a risk factor for AD. The frequencies of the hOGG1-Ser326Cys, APE1-Asp148Glu and XRCC1-Arg280His and XRCC1-Arg399Gln variant alleles in our control group were 0.23, 0.31, 0.10 and 0.33, respectively. No significant association was observed between the variant alleles of hOGG1-Ser326Cys (OR=1.32, 95% CI=0.83-2.11), APE1-Asp148Glu (OR=1.08, 95% CI=0.70-1.68), XRCC1-Arg280His (OR=0.53, 95% CI=0.24-1.14) and XRCC1-Arg399Gln (OR=1.05, 95% CI=0.68-1.63) and AD. Our results suggest that the polymorphic variants of these BER genes are not independent risk factors for AD.     

hOGG1(326), XRCC1(399) and XRCC3(241) polymorphisms influence micronucleus frequencies in human lymphocytes in vivo

A pooled analysis of five biomonitoring studies was performed to assess the influence of hOGG1(326), XRCC1(399) and XRCC3(241) gene polymorphisms on micronuclei (MN) frequency in human peripheral blood lymphocytes, as measured by the ex vivo/in vitro cytokinesis-block micronucleus (CBMN) assay. Each study addressed a type of occupational exposure potentially able to induce DNA strand breakage (styrene, ionising radiation, cobalt/hard metal, welding fumes and inorganic arsenite compounds), and therefore MN, as a result of base excision repair and double-strand break repair deficiencies. The effect of genotype, age, exposure to genotoxic agents and smoking habit on MN induction was determined using Poisson regression analysis in 171 occupationally exposed male workers and in 132 non-exposed male referents. The analysis of genotype-genotype, genotype-smoking and genotype-exposure interactions by linear combinations of parameters showed significantly higher MN frequencies in the following subsets: (i) occupationally exposed workers carrying either the Thr/Thr or the Thr/Met XRCC3(241) genotypes compared to their referent counterparts (P < 0.001) and (ii) carriers of the Met/Met XRCC3(241) genotype compared to Thr/Thr XRCC3(241) carriers, as far as they are non-exposed and bear the variant (Ser/Cys or Cys/Cys) hOGG1(326) genotype (P < 0.01). Significantly lower MN frequencies were observed in carriers of the variant hOGG1(326) genotype compared to Ser/Ser hOGG1(326) carriers in the subgroup of non-smokers with Thr/Thr XRCC3(241) genotype (P < 0.01). Stratified analysis by occupational exposure showed a significant MN increase with smoking in occupationally exposed carriers of the Arg/Gln XRCC1(399)genotype (P < 0.001). In contrast, a significant MN decrease with smoking was observed in referents carrying the Ser/Ser hOGG1(326) genotype (P < 0.01). These findings provide evidence that the combination of different DNA repair genes and their interaction with environmental genotoxic agents may modulate MN induction. Understanding the complexity of the relationships between exposure, DNA repair and MN frequencies require larger scale studies and complementary biomarkers.     

DNA base excision repair gene polymorphisms modulate human cognitive performance and decline during normal life span

To test the hypothesis that single nucleotide polymorphisms (SNPs) in DNA repair genes are associated with cognitive performance during normal aging, the relationship between SNPs in selected exons in DNA base excision repair (BER) genes and cognitive performance was examined in 712 healthy Norwegian individuals aged 20-75 years. SNPs examined included PolB(Pro242Arg), hOGG1(Ser326Cys), MutYH (Met22Val), MutYH(His324Gln), APE1(Gln51His), APE1(Glu148Asp), XRCC1(Lys298Asn), XRCC1(Arg7Leu), NEIL1(Asp252Asn), and NEIL2(Arg257Leu). XRCC1(Arg7Leu) and PolB(Pro242Arg) were characterized by single nucleotide variations (≤0.1% homozygote SNPs). hOGG1(Ser326Cys) (Ser/Cys 40.8%/Cys/Cys 5.7%), MutYH(His324Gln) (His/Gln37%/Gln/Gln 6.0%) and APE1(Glu148Asp) (Glu/Asp 51.3%/Asp/Asp 23.0%) were characterized by higher SNP frequencies. MutYH(Met22Val), APE1(Gln51His) and NEIL2(Arg257Leu) occurred at intermediate SNP frequencies of 11.5, 7.6 and 5.3%, respectively. Interestingly, hOGG1(Ser326Cys) and APE1(Gln51His) had genotype by age interactions with general cognitive function, reasoning, control and speed of processing in cross-sectional analysis and a significant effect on longitudinal decline. Dispersed association effects involving MutYH(His324Gln), MutYH(Met22Val), PolB(Pro242Arg) and NEIL2(Arg257Leu) were also detected when APOE or CHRNA4, were included in the statistical model, a result consistent with proposed involvement of the latter markers in human cognitive decline and/or function. In summary, the results support the notion that polymorphisms in BER genes modulate cognitive performance in healthy elderly individuals.     

Radio-adaptive response,individual radio-sensitivity and correlation of base excision repair gene polymorphism (hOGG1, APE1, XRCC1, and LIGASE1) in human peripheral blood mononuclear cells exposed to gamma radiation

Radio-adaptive response (RAR) is a biological mechanism, where cells primed with a low dose exhibit reduced DNA damage with a high challenging dose. Single nucleotide polymorphisms (SNPs) of DNA repair genes including base excision repair (BER) pathway are known to be associated with radio-sensitivity but involvement in RAR is not yet understood. In the present study, attempt was made to correlate genotype frequencies of four BER SNPs [hOGG1(Ser326Cys), XRCC1(Arg399Gln), APE1(Asp148Glu) and LIGASE1(A/C)] with DNA damage, repair and mRNA expression level among 20 healthy donors (12 adaptive and 8 nonadaptive). Our results revealed that LIGASE1 (p = .002) showed significant correlation with DNA damage and mRNA expression level with increasing dose. hOGG1 (Ser326Cys), XRCC1 (Arg399Gln) and LIGASE1(A/C) polymorphisms showed significant difference with DNA damage (%T) and mRNA expression profile in primed cells among adaptive donors. In conclusion, BER gene polymorphisms play important role in identifying donors with radio-sensitivity and RAR in human cells.     

Polymorphisms in DNA repair genes as risk factors for spina bifida and orofacial clefts

Repairing DNA damage is critical during embryogenesis because development involves sensitive periods of cell proliferation, and abnormal cell growth or death can result in malformations. Knockout mouse experiments have demonstrated that disruption of DNA repair genes results in embryolethality and structural defects. Studies using mid-organogenesis rat embryos showed that DNA repair genes were variably expressed. It is hypothesized that polymorphisms that alter the functionality of DNA repair enzymes may modify the risk of malformations. We conducted a case-control analysis to investigate the relationship between DNA repair gene polymorphisms and the risk of spina bifida and oral clefts. Newborn screening blood spot DNA was obtained for 250 cases (125 spina bifida, 125 oral clefts) identified by the California Birth Defects Monitoring Program, and 350 non-malformation controls identified from birth records. Six single nucleotide polymorphisms of five DNA repair genes representing three distinct repair pathways were interrogated including: XRCC1 (Arg399Gln), APE1 (Asp148Glu), XRCC3 (Thr241Met), hOGG1(Ser326Cys), XPD (Asp312Asn, Lys751Gln). Elevated or decreased odds ratios (OR, adjusted for race/ethnicity) for spina bifida were found for genotypes containing at least one copy of the variant allele for XPD [751Gln, OR = 1.62; 95% confidence interval (CI) = 1.05-2.50] and APE 148 (OR = 0.58; CI = 0.37-0.90). A decreased risk of oral clefts was found for XRCC3 (OR = 0.62; CI = 0.39-0.99) and hOGG1 (326 Cys/Cys, OR = 0.22; CI = 0.06-0.78). This study suggested that polymorphisms of DNA repair genes, representing different major repair pathways, may affect risk of two major birth defects. Future, larger studies, examining additional repair genes, birth defects, and interaction with exposures are recommended.     

XRCC1 polymorphisms and risk of papillary thyroid carcinoma in a Korean sample

Polymorphisms of DNA repair genes, X-ray repair cross-complementing group 1 (XRCC1) might contribute to individual susceptibility to different types of cancers. We analyzed the relationship between XRCC1 polymorphisms and the risk of papillary thyroid carcinoma in a Korean sample. A hospital-based case-control study was performed in 111 papillary thyroid carcinoma patients and 100 normal control subjects. XRCC1 Arg194Trp and Arg399Gln single nucleotide polymorphisms (SNPs) were genotyped by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). The XRCC1 Arg194Trp Arg/Trp genotype was significantly associated with a decreased risk of papillary thyroid carcinoma compared to that of Arg/Arg genotype (odds ratio [95% confidence intervals]; 0.550 [0.308-0.983]). There was no significant association between XRCC1 Arg399Gln genotypes and risk of papillary thyroid carcinoma. Based on these results, the XRCC1 Arg194Trp Arg/Trp genotype could be used as a useful molecular biomarker to predict genetic susceptibility for papillary thyroid carcinoma in Koreans.     

Association of GSTP1 and XRCC1 gene polymorphisms with clinical outcome of advanced non-small cell lung cancer patients with cisplatin-based chemotherapy

We investigated the association between the clinical outcome and GSTP1 and XRCC1 gene polymorphisms in advanced NSCLC patients with cisplatin-based chemotherapy. We prospectively recruited 325 NSCLC patients between January 2010 and January 2014. Genotypes of GSTP1 A313G, XRCC1 Arg194Trp, Arg280His and Arg399Gln were conducted using polymerase chain reaction restriction fragment length polymorphism (PCR-RFLP) assay. AG and GG genotypes of GSTP1 A313G were correlated with a higher CR + PR when compared with AA genotype. Furthermore, GA and AA genotypes of XRCC1 Arg399Gln were associated with more CR + PR when compared with GG genotype. In the Cox proportional hazards model, GG genotype of GSTP1 A313G was significantly correlated with a longer median survival time when compared with AA genotype, and it is associated with a heavy decreased risk of death from NSCLC. Moreover, GA and AA genotypes of XRCC1 Arg399Gln had a significantly longer median survival time, and GA and AA genotypes were significantly associated with a moderate reduced risk of death from NSCLC. GSTP1 A313G and XRCC1 Arg399Gln gene polymorphisms might influence the response to cisplatin-based chemotherapy and affect the clinical outcome of advanced NSCLC.