XPD基因单核苷酸多态性与晚期非小细胞肺癌对铂类药物敏感性的关系

目的 研究DNA修复基因着色性干皮病基因(XPD) Lys751Gln和XPD Asp312Asn基因多态性与非小细胞肺癌化疗铂类敏感性的关系.方法 收集经病理学确诊的晚期非小细胞肺癌87例,所有病例化疗前抽静脉血,提取DNA,用多聚酶链反应-限制性片段长度多态性(PCR-RFLP)分析技术检测XPD Lys751Gln和XPD Asp312Asn基因型,比较不同基因型与铂类化疗疗效的关系及与无进展生存时间的关系.结果 总有效率43.7%,CR 3例(3.45%),PR 35例(40.23%),SD 20例(22.99%),PD 29例(33.33%),携带XPD751Lys/Lys、Lys/GIn基因型的患者,客观有效(CR+PR)分别为36例(48.6%)、2例(15.4%)二者相比差异有统计学意义(P=0.026).携带XPD 312Asp/Asp、Asp/Asn基因型的患者,客观有效(CR+PR)分别为35例(40.23%)、3例(30.0%)二者相比差异无统计学意义(P=0.556).携带XPD751 Lys/Lys、Lys/Gln与XPD312 Asp/Asp、Asp/Asn基因型的患者无进展生存时间(PFS)分别为6.7和5.9个月、6.5和6.4个月,无统计学意义(P=0.170、P=0.674).Cox回归模型分析显示XPD751位点基因型为Lys/Gln的患者疾病进展风险是基因型为Lys/Lys的患者的2.383倍(P=0.006).XPD751位点基因型为Lys/Gln可能是疾病进展较早的因素.结论 XPD Lys751Gln单核苷酸多态性与晚期非小细胞肺癌铂类药物耐药有关.未发现XPD基因单核苷酸多态性与无进展生存时间相关,但XPD751位点基因型为Lys/Gln可能是疾病进展较早的危险因素.     

DNA切除修复基因XPD在肝癌中遗传易感性的荟萃分析

目的 探讨DNA切除修复基因XPD基因多态性在中国人群原发性肝癌中的遗传易感性. 方法 检索中外数据库,获得有关XPD基因多态性与肝癌发病风险的病例对照研究资料进行Meta分析,得到合并的优势比(OR)和95％可信区间(95％CI). 结果 共纳入XPD基因多态位点相关文献6篇,累计病例3424例,对照3636例;在XPD基因多态位点751和312位点等位基因的OR (95％CI)分别为1.25 (0.70～ 2.24)和0.85 (0.58～ 1.25);在XPD基因多态位点751,与野生基因型Lys/Lys相比,(Lys/Gln+Gln/Gln)合并的OR(95％CI)为1.31(0.71 ～ 2.42);在XPD基因多态位点312位点,与野生基因型Asp/Asp相比,(Asp/Asn+Asn/Asn)合并的OR值(95％CI)为1.19 (0.73～ 1.95). 结论 XPD多态性遗传位点751和312不是中国人群原发性肝癌发病的风险因素.     

核苷酸切除修复基因ERCC1、XPD和XPC多态性与燃煤污染型地方性砷中毒的关系研究

目的 探讨核苷酸切除修复基因ERCCI、XPD、XPC不同基因型与燃煤污染型砷中毒发病风险的关系.方法 以贵州省兴仁县交乐村燃煤污染型砷中毒病区229例砷中毒患者作为病例组,以有相似生活习惯、无燃用高砷煤史的非砷暴露村大果朵村198名居民作为对照组,每人抽取外周静脉血约2 ml提取DNA,采用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)技术进行ERCC1 C8092A 、XPD Lys751 Gln、XPD Asp312Asn、XPD Arg156Arg、XPC P(AT+/-)多态位点检测.结果 病例组ERCC1 C8092A位点CA/AA基因型分布频率[ CA:29.78％ (67/225)、AA:10.67％ (24/225)]显著高于对照组[CA:23.08％( 45/195)、AA:5.13％ (10/195),x2=8.116,P＜0.05];其余各基因多态位点的基因型分布频率差异无统计学意义(x2值分别为5.649、4.394、0.865、1.490,P均＞0.05).携带ERCCI 8092CA+ AA、XPD Lys751Gln+ Gln751Gln 、XPD Asp312Asn+ Asn312Asn基因型个体分别较携带ERCC1 8092CC、XPD Lys751Lys、XPD Asp312Asp基因型个体发生砷中毒的风险升高1.780、1.681、1.790倍(95％CI分别为1.174～2.698、1.081～2.615和1.014～3.158,P均＜0.05);单一的XPD 基因Arg156Arg位点、XPC基因P(AT+/-)位点对砷中毒的发病风险没有影响(P均＞0.05).结论 核苷酸切除修复基因ERCC1 C8092A、XPD Lys751 Gln和Asp312Asn位点的多态性与燃煤污染型砷中毒的发病风险有关.     

XPD基因遗传多态性与晚期结直肠癌患者对铂类药物敏感性关系的研究

目的 探讨核苷酸切除修复系统基因XPD遗传多态性与晚期结直肠癌(CRC)患者对铂类药物化疗敏感性的关系.方法 对晚期CRC患者96例进行含奥沙利铂的联合化疗,以影像学方法判定其疗效.在治疗前抽血检测XPD Asp312Asn和XPD Lys751Gln基因多态性,比较不同基因型患者的化疗敏感性.结果 患者化疗后部分缓解(PR)20例,稳定(SD)59例,进展(PD)17例,有效率(RR)为20.8%.多因素分析表明,携带Gln/Gln基因型患者的疾病进展风险是至少携带一个Lys等位基因(Lys/Lys和Lys/Gln基因型)个体的7.8倍(OR＝7.813,95%CI=1.834～33.277,P＜0.05),但未观察到XPD Asp312Asn多态与化疗敏感性相关,未发现XPD基因多态在影响铂类药敏感性中存在联合作用.结论 XPD基因遗传多态与晚期CRC对铂类化疗的敏感性相关.     

XPD基因遗传多态与晚期结直肠癌患者化疗后生存期的关系

采用聚合酶链反应-限制性长度片段分析法检测96例晚期结直肠癌患者化疗前的XPD Asp312Asn和XPD Lys751Gin基因多态性分型，比较不同基因型患者化疗后的中位生存时间（MST）。结果XPD 751Lys／Lys基因型患者MST17．3个月，显著高于XPD 751Lys／Gln或Gin／Gin基因型患者（12．5个月）。XPD 312Asp／Asp基因型患者MST与XPD 312Asp／Ash或Asn／Asn基因型患者相比较无统计学差异。提示XPD Lys751GIn基因多态性与晚期结直肠癌患者化疗后的预后有关。     

Xeroderma pigmentosum group D polymorphisms and esophageal cancer susceptibility: A meta-analysis based on case-control studies

AIM: To clarify the effects of the xeroderma pigmentosum group D(XPD) Asp312 Asn and Lys751 Gln gene polymorphisms on the risk of esophageal cancer(EC).METHODS: A computerised literature search was conducted to identify the relevant studies from the PUBMED and EMBASE databases, reviews, and reference lists of relevant articles. Odds ratios(ORs) with 95% confidence intervals(CIs) were used to assess the associations between the XPD Asp312 Asn and/or Lys751 Gln polymorphisms and EC susceptibility. Statistical analyses were performed using the software Stata 12.0. A fixed or random effects model was selected based on a heterogeneity test. Publication bias was estimated using funnel plots and Egger’s linear regression method. Subgroup analyses were performed based on histological type and ethnicity.RESULTS: Thirteen case-control studies with a total of 10 comparisons for the Asp312 Asn polymorphism, including 2373 cases and 3175 controls, and 15 comparisons for the Lys751 Gln polymorphism, including 3226 cases and 5237 controls, were recruited for the meta-analysis. In terms of the XPD Asp312 Asn polymorphism, significantly increased EC risks were identified in the Asp/Asn vs Asp/Asp comparison(OR = 1.17, 95%CI: 1.02-1.33, P = 0.03) and in the dominantmodel comparison(Asn/Asn+Asp/Asn vs Asp/Asp: OR = 1.18, 95%CI: 1.04-1.34, P = 0.01). However, no significant associations were found in the Asn/Asn vs Asp/Asp comparison(OR = 1.30, 95%CI: 1.00-1.70, P = 0.05) or in the recessive-model comparison(Asn/Asn vs Asp/Asn + Asp/Asp: OR = 1.17, 95%CI: 0.91-1.50, P = 0.22). In terms of the XPD Lys751 Gln polymorphism, a significant association with EC susceptibility was found under the recessive model(Gln/Gln vs Lys/Gln+Lys/Lys: OR = 1.21, 95%CI: 1.02-1.43, P = 0.03). However, no associations were identified in the other comparisons(co-dominant model: Lys/Gln vs Lys/Lys: OR = 1.11, 95%CI: 0.94-1.31, P = 0.20; Gln/Gln vs Lys/Lys: OR = 1.31, 95%CI: 0.98-1.75, P = 0.07; dominant model: OR = 1.14, 95%CI: 0.96-1.35, P = 0.14).CONCLUSION: The results of this meta-analysis suggest that the XPD Asp312 Asn and Lys751 Gln gene polymorphisms are associated with a significantly increased risk for EC.     

XRCC1和XPD单核苷酸多态性预测晚期NSCLC铂类化疗敏感性的研究

目的探讨DNA损伤修复基因XRCC1和XPD单核苷酸多态性与晚期非小细胞肺癌(NSCLC)对铂类药物化疗敏感性的关系。方法以聚合酶链反应结合限制性片段长度多态性(PCR-RFLP)方法,检测166例以顺铂(DDP)为基础药物化疗的晚期NSCLC患者XRCC1 Arg194Trp和XPD Asp312Asn多态基因型,并比较不同基因型与化疗敏感性的关系。结果化疗总有效率(CR PR)为31.3%,其中CR2例,PR50例,SD70例,PD44例。携带至少1个XRCC1第194位密码子Trp等位基因患者化疗敏感性是携带Arg/Arg基因型患者的4.3倍(OR=4.32,95%CI=2.10~8.87,P=0.000);携带XPD第312位密码子Asp/Asp基因型患者化疗敏感性是携带至少1个Asn基因型患者的3.5倍(OR=3.49,95%CI=1.76~6.96,P=0.000)。联合分析这两个遗传多态性发现,尚不能认为XRCC1 Arg194Trp和XPD Asp312Asn多态性在NSCLC对铂类药物敏感性中存在联合作用(P>0.05)。结论XRCC1 Arg194Trp和XPD Asp312Asn单核苷酸多态性可能与NSCLC铂类药物敏感性有关。     

LMP2/LMP7基因多态性与乙型肝炎病毒感染结局的关系

目的:探讨低相对分子质量蛋白酶体(LMP)基因单核苷酸多态性(SNP)与HBV感染结局之间的关联.方法:提取287例HBV持续感染者(包括无症状HBV携带者、慢性乙型肝炎及乙型肝炎后肝硬化患者)及278例健康对照外周血基因组DNA,用PCR-RFLP方法分析LMP2/LMP7基因Codon60/Codon145两个多态性位点的基因型.结果:LMP7基因多态性位点在健康对照与无症状HBV携带者之间的差异有统计学意义(P＜0.05),与携带Gln/Gln基因型者比较,携带Gln/Lys基因型者乙型肝炎患病风险增加3.35倍(95%CI:2.02-5.58),携带Lys/Lys基因型者乙型肝炎患病风险增加3.46倍(95%CI:1.41-8.48),携带至少1个Lys等位基因者(即Gln/Lys和Lys/Lys基因型)乙型肝炎患病风险增加3.37倍(95%CI:2.06-5.52);LMP7基因多态性位点在健康对照与进展性肝炎(包括慢性乙型肝炎和肝硬化)患者之间的差异有统计学意义(P＜0.05),与携带Gln/Gln基因型者比较,携带Gln/Lys基因型者乙型肝炎患病风险增加2.22倍(95%CI:1.48-3.32),携带Lys/Lys基因型者乙型肝炎患病风险增加4.33倍(95%CI:2.15-8.73),携带至少1个Lys等位基因者(即Gln/Lys和Lys/Lys基因型)乙型肝炎患病风险增加2.49倍(95%CI:1.69-3.65);LMP2/LMP7基因多态性位点在无症状HBV携带者与进展性肝炎患者间的差异无统计学意义(p>0.05).结论:LMP7基因可能是无症状HBV携带和进展性肝炎的易感基因:LMP基因多态性与HBV感染的结局可能无明显相关性.     

XRCC1和XPD单核苷酸多态性与非小细胞肺癌铂类药物化疗敏感性的关系

目的研究X线修复交叉互补基因1（XRCC1）和着色性干皮病基因（XPD）单核苷酸多态性与老年晚期非小细胞肺癌（NSCLC）铂类药物化疗敏感性关系。方法应用聚合酶链反应结舍限制性片段长度多态性（PCR-RFLP）的方法检测81例以铂类药物为主要化疗方案的NSCLC患者XRCC1 Arg399Gln和XPD Lys751Gin基因型多态性，采用非条件Logistic回归分析不同基因型与化疗疗效的关系。结果81例患者化疗总有效率为35．8％，其中完全缓解（CR）、部分缓解（PR）、稳定（SD）和进展（PD）患者分别为0、29、31、21例。携带至少1个XRCC1 399Arg等位基因的患者化疗敏感性是携带Gln／Gln基因型患者的4.52倍（OR=4．52，95％CI=1.11—18．38）。未发现XPD Lys751Gin遗传多态与化疗敏感性相关。结论XRCC1 Arg399Gln多态可能与晚期NSCLC铂类药物化疗敏感性有关。     

XPD、XRCC1基因多态性预测晚期NSCLC对铂类药物的化疗敏感性

采用PCR-RFLP方法检测162例接受铂类药物化疗的晚期非小细胞肺癌（NSCLC）患者的DNA修复基因XPD和XRCC1的基因多态性，比较不同基因型对化疗敏感性的影响。携带Asn／Asn基因型患者的化疗失败风险是至少携带一个Asp等位基因（Asp／Asp和Asp／Asn基因型）个体的3倍（P〈O．05），而携带Arg／Arg基因型患者的化疗失败风险是至少携带一个Trp等位基因（Arg／Trp和Trp／Trp基因型）个体的2倍（P〈0．05），二者联合多态性分析发现，携带Asp／Asp和Arg／Trp基因型的患者化疗有效率最高，提示DNA修复基因多态性可以预测晚期NSCLC患者对铂类药物的化疗敏感性。     

XPD Asp312Asn polymorphism is a risk factor for prostate cancer

Purpose

The association between Asp312Asn and Lys751Gln polymorphisms of Xeroderma pigmentosum Group D (XPD) and prostate cancer risk are still inconclusive. For better understanding of the effects of these two polymorphisms on prostate cancer risk, a meta-analysis was performed.

Methods

An extensive search was performed to identify all case–control studies investigating such association. The strength of association between these two polymorphisms and prostate cancer risk was assessed by odds ratio (OR) with the corresponding 95?% confidence interval (95?% CI).

Results

A total of seven case–control studies were identified, among which five studies (1,257 cases and 1,956 controls) were eligible for Asp312Asn polymorphism and six studies (1,451 cases and 2,375 controls) were eligible for Lys751Gln polymorphism. Asp312Asn polymorphism was associated with an increased risk of prostate cancer in additive and recessive genetic models (additive model: OR?=?1.68, 95?% CI?=?1.28–2.22, P?=?0.00; recessive model: OR?=?1.65, 95?% CI?=?1.27–2.15, P?=?0.00). In the subgroup analysis, Asp312Asn polymorphism was associated with an increased risk of prostate cancer among Asians in all three genetic models (additive model: OR?=?2.09, 95?% CI?=?1.39–3.14, P?=?0.00; dominant model: OR?=?1.49, 95?% CI?=?1.12–1.98, P?=?0.01; recessive model: OR?=?1.93, 95?% CI?=?1.31–2.83, P?=?0.00). However, no significant associations were found between Lys751Gln polymorphism and prostate cancer risk in the overall analyses or the subgroup analyses by ethnicity.

Conclusions

The results of this meta-analysis indicate that the XPD Asp312Asn polymorphism is a risk factor for prostate cancer development.     

Association Between XPD Lys751Gln and Asp312Asn Polymorphisms and Hepatocellular Carcinoma Risk: A Systematic Review And Meta-Analysis

Genetic polymorphisms of xeroderma pigmentosum group D (XPD) in the nucleotide excision repair pathway may influence cancer susceptibility by affecting the capacity for DNA repair. Studies investigating the association between XPD Lys751Gln and Asp312Asn polymorphisms and hepatocellular carcinoma (HCC) risk reported inconsistent results. The aim of this study was to quantitatively summarize the evidence for such an association.Eligible studies were identified by searching electronic databases including PubMed, Embase, Cochrane library, and CBM, Chinese Biomedical Literature Database, for the period up to October 2014. The association of XPD Lys751Gln and Asp312Asn polymorphisms and HCC risk was assessed by odds ratios (ORs) together with their 95% confidence intervals (CIs).Finally, a total of 11 studies with 4322 cases and 4970 controls were included for XPD Lys751Gln polymorphism and 6 studies with 2223 cases and 2441 controls were available for XPD Asp312Asn polymorphism. With respect to XPD Lys751Gln polymorphism, statistically significant increased HCC risk was found when all studies were pooled into the meta-analysis (Gln/Gln vs Lys/Lys: OR = 1.363, 95% CI 1.065–1.744, P = 0.014; Lys/Gln vs Lys/Lys: OR = 1.205, 95% CI 1.099–1.321, P = 0.000; Gln/Gln+Lys/Gln vs Lys/Lys: OR = 1.300, 95% CI 1.141–1.480, P = 0.000). In subgroup analyses by ethnicity, source of control, Hardy–Weinberg equilibrium (HWE) in controls, hepatitis B virus (HBV) infection, and statistically significant increase of HCC risk was found in East Asians, population-based studies, studies consistent with HWE, and HBV-positive subjects, but not in mixed/other populations, hospital-based studies, studies deviating from HWE, and HBV-negative subjects. With respect to XPD Asp312Asn polymorphism, no significant association with HCC risk was found in the overall and subgroup analyses.The results suggest that the XPD Lys751Gln polymorphism contributes to increased HCC susceptibility, especially in East Asian populations. Further, large and well-designed studies are required to validate this association.     

Excision repair cross-complementing group 2/Xeroderma pigmentousm complementation group D (ERCC2/XPD) genetic variations and susceptibility to diffuse large B cell lymphoma in Egypt

Diffuse large B-cell lymphoma (DLBCL) is a genetically heterogeneous neoplasm. Although several genetic and environmental factors have been postulated, no obvious risk factors have been emerged for DLBCL in the general population. DNA repair systems are responsible for maintaining the integrity of the genome and protecting it against genetic alterations that can lead to malignant transformation. The current study aimed at investigating the possible role of ERCC2/XPD Arg156Arg, Asp312Asn and Lys751Gln genetic polymorphisms as risk factors for DLBCL in Egypt. The study included 81 DLBCL patients and 100 healthy controls. Genotyping of the studied genetic polymorphisms was performed by polymerase chain reaction–restriction fragment length polymorphism technique. Our results revealed that there was no statistical difference encountered in the distribution of ?Asp312Asn and ?Lys751Gln polymorphic genotypes between DLBCL cases and controls, thus it could not considered as molecular risk factors for DLBCL in Egyptians. However, Arg156Arg polymorphism at exon-6 conferred twofold increased risk of DLBCL (OR 2.034, 95 %CI 1.015–4.35, p = 0.43), and the risk increased when co-inherited with Lys751Gln at exon-23 (OR 3.304, 95 %CI 1.113–9.812, p = 0.038). In conclusion, ERCC2/XPD Arg156Arg polymorphism might be considered as a genetic risk factor for DLBCL in Egyptians, whether alone or conjoined with Lys751Gln.     

Xeroderma pigmentosum group D 751 polymorphism as a predictive factor in resected gastric cancer treated with chemo-radiotherapy

INTRODUCTION The xeroderma pigmentosum group D (XPD) gene en- codes a protein required for nucleotide excision repair (NER). This product recognizes and repairs a wide range of structurally unrelated lesions such as bulky adducts caused by UV light, envir…     

Lack of association between XPD Lys751Gln and Asp312Asn polymorphisms and colorectal cancer risk: a meta-analysis of case�Ccontrol studies

Purpose  

The published data on the association between xeroderma pigmentosum group D (XPD) Lys751Gln and Asp312Asn polymorphisms and colorectal cancer remained controversial. The present meta-analysis of literatures was performed to derive a more precise estimation of the relationship.     

Prognostic importance of DNA repair gene polymorphisms of <Emphasis Type="Italic">XRCC1</Emphasis> Arg399Gln and <Emphasis Type="Italic">XPD</Emphasis> Lys751Gln in lung cancer patients from India

Purpose Inter individual variation in lung cancer susceptibility may be modulated in part through genetic polymorphisms in the DNA repair genes, especially the genes involved in the Base Excision Repair (BER) and nucleotide excision repair (NER) pathway. Two of the genetic polymorphisms, XRCC1Arg399Gln and XPD Lys751Gln have been extensively studied in the association with lung cancer risk, although published studies have been inconclusive. Methods In order to verify the role of the common variant alleles in the XPD gene, we have genotyped 211 lung cancer patients and 211 healthy controls using PCR-RFLP assays in a hospital based, case-control study in an Indian population. Logistic regression models were fit to examine the relationship between the log odds of lung cancer and each covariate. Overall Survival in relation to various genotypes and clinicopathological factors were analyzed using Kaplan Meier estimates and hazard ratios were calculated using Cox Regression analysis. Results The carriers of XRCC1 399 AA genotypes were at higher risk of lung cancer (OR = 2.1, 95% CI:1.224–3.669, P = 0.007) than carriers of GG genotype. Subjects carrying 751 AC genotype were at an increased risk of carcinoma of the lung (OR = 1.8; 95% CI:1.233–2.807, P = 0.003) than subjects with AA genotypes. Compared to the XRCC1 399 GG/ XPD 751 AA reference genotype, the combined variants, XRCC1 399 GG/ XPD 751 AC+CC (OR = 1.9, 95% CI: 1.037–3.481), P = 0.03), XRCC1 399 GA+AA/ XPD 751 AA (OR = 1.7, 95% CI: 1.020–2.833, P = 0.04), XRCC1 399 GA+AA/XPD 751 AC+CC (OR = 2.7, 95% CI: 1.582–4.864, P = 0.01), had significantly higher odds ratios. Increasing numbers of either XPD or XRCC1 variant alleles were associated with shorter overall survival, the risk being significant for the XRCC1 gene polymorphism (P = 0.01 by log-rank test). The hazard of dying was significant for the XRCC1 399 AA genotype (HR = 3.04, 95%CI: 1.393–6.670, P = 0.005). Higher tumour stage also came out as significant predictors of patient death. Conclusions These findings suggest that genetic polymorphisms in the DNA repair genes may modulate overall lung cancer susceptibility and that pathological stage and XRCC1 Arg399Gln independently predicted overall survival among Indian lung cancer patients.     

DNA repair gene XRCC1 and XPD polymorphisms and their association with coronary artery disease risks and micronucleus frequency

Coronary artery disease (CAD) is a multifactorial process that appears to be caused by the interaction of environmental risk factors with multiple predisposing genes. In this study, we investigated the effects of the XPD Lys751Gln and XRCC1 Arg399Gln polymorphisms on the presence and the severity of CAD. We also investigated the presence of DNA damage in the peripheral lymphocytes of patients with CAD by using the micronucleus (MN) test and the effect of XPD Lys751Gln and XRCC1 Arg399Gln polymorphisms on this damage. The study population consisted of 147 patients with angiographically documented CAD and 48 healthy controls. No association between XPD Lys751Gln or XRCC1 Arg399Gln polymorphisms and the presence or the severity of CAD was observed. On the other hand, a significantly higher frequency of MN was observed in CAD patients compared with controls (5.7 ± 1.9 vs 5.0 ± 2.1, respectively, P = 0.018). We found an elevated frequency of MN in CAD patients with the XPD 751Gln allele (Gln/Gln genotype) or the XRCC1 399Gln (Arg/Gln or Gln/Gln genotypes) allele compared with the XPD 751Lys (Lys/Lys genotype) allele or XRCC1 399 Arg (Arg /Arg genotype) allele, respectively. These preliminary results suggest that XPD Lys751Gln and XRCC1 Arg399Gln polymorphisms may not be a significant risk factor for developing CAD. In addition, our results indicate that the MN frequency is associated with presence, but not severity, of CAD and is related to the XRCC1 Arg399Gln and XPD Lys751Gln polymorphisms, suggesting an elevated frequency of MN in CAD patients with the XPD 751Gln or XRCC1 399Gln alleles.