中晚期NSCLC患者3种不同组织中DNA修复基因XRCC3多态性检测结果比较

目的探讨肿瘤组织、循环肿瘤细胞(CTC)及外周血3种组织中检测晚期非小细胞肺癌(NSCLC)患者DNA修复基因——X线修复交叉互补基因3(XRCC3)多态性的临床应用价值。方法收集NSCLC患者84例,采用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)法分别检测NSCLC患者肿瘤组织、CTC及外周血标本中XRCC3基因Thr241Met(rs861539)位点基因型,并比较3种检测方案的一致性。结果 CTC个数在不同性别、年龄、病理类型及临床分期的NSCLC患者之间的差异均无统计学意义(P均0.05);肿瘤组织、CTC及外周血标本中XRCC3基因Thr241Met(rs861539)位点多态性的阳性率差异亦无统计学意义(P均0.05);以肿瘤组织检测结果为金标准,CTC中XRCC3基因Thr241Met(rs861539)位点多态性的一致性[95.24%(80/84)]明显高于外周血标本[76.19%(64/84)],差异有统计学意义(P0.01);XRCC3基因Thr241Met(rs861539)位点多态性在不同年龄、病理类型及TNM分期的NSCLC患者之间的差异均有统计学意义(P0.05)。结论检测中晚期NSCLC患者CTC中XRCC3基因Thr241Met(rs861539)位点多态性的准确性高,可替代肿瘤组织,临床应用价值较高。     

XRCC3基因Thr241Met多态性与中国人肺癌易感性关系的Meta分析

目的 系统评价XRCC3基因Thr241Met多态性与中国人肺癌发病风险的相关性.方法 计算机检索PubMed、EMbase、CNKI、VIP和WanFang Data,查找国内外关于XRCC3基因Thr241Met多态性与中国人群肺癌易感性关系的研究,检索时限均为建库至2013年8月20日.由2名评价者根据纳入与排除标准独立筛选文献,提取资料并评价质量后,采用RevMan 5.0软件和Stata 10.0软件进行Meta分析,采用Egger's线性回归法分析发表偏倚.结果 最终纳入5个研究,包括肺癌患者2999例,对照2994例.Meta分析结果显示:对于中国人群而言,携带XRCC3基因Thr241Met多态性突变基因型/等位基因的个体肺癌发病风险不会明显增加:Met/Met vs.Thr/Thr:OR=1.00,95％CI (0.38,2.59),P=0.99; Met/Met vs.Thr/Met:OR=1.06,95％CI (0.83,1.36),P=0.63; Met/Met vs.Thr/Met+Thr/Thr:OR=0.99,95％CI (0.38,2.57),P=0.98; Thr/Met+Met/Met vs.Thr/Thr:OR=1.06,95％CI (0.82,1.37),P=0.65; Met vs.Thr:OR=1.05,95％CI (0.82,1.35),P=0.68.结论 目前尚未发现XRCC3基因Thr241Met多态性与中国人群肺癌发病风险相关.受纳入研究数量的限制,上述结论需更多高质量大样本研究进一步验证.     

程序性死亡受体1基因多态性与胃癌铂类药物化疗敏感性的相关性研究

目的 探讨程序性死亡受体1(PD-1)基因rs36084323、rs2227982、rs7421861位点多态性与胃癌铂类药物化疗敏感性的相关性.方法 选取103例胃癌患者作为研究对象,给予奥沙利铂联合替吉奥(S OX)方案或者紫杉醇脂质体联合顺铂、5-氟尿嘧啶(PCF)方案化疗2个周期,化疗结束后根据实体肿瘤疗效评价标准(RECIST) 1.1版将患者分为敏感组45例和抗拒组58例.化疗结束后,采集患者外周静脉血,应用TaqMan探针单核苷酸多态性(SNP)基因分型技术检测PD-1基因rs36084323、rs2227982、rs7421861位点多态性,并分析其与胃癌患者铂类药物化疗敏感性的关系.结果 PD-1基因rs36084323、rs2227982、rs7421861位点基因型频率分布均符合Hardy-Weinberg平衡定律(P＞0.05);敏感组与抗拒组的rs2227982、rs7421861位点PD-1基因型、等位基因分布情况比较,差异有统计学意义(P＜0.05).rs2227982位点TT基因型(OR=1.739,95％CI为1.656～ 1.867)、CT基因型(OR=1.524,95％CI为1.435～1.663)化疗敏感性较CC基因型提高,T等位基因化疗敏感性较C等位基因提高(OR =1.721,95％CI为1.603～ 1.851),差异有统计学意义(P＜0.05);rs7421861位点TT基因型(OR=1.605,95％CI为1.556 ～1.767)、CT基因型(OR=1.414,95％CI为1.372 ～ 1.525)化疗敏感性较CC基因型降低,T等位基因化疗敏感性较C等位基因降低(OR =1.531,95％CI为1.423 ～ 1.672),差异有统计学意义(P＜0.05).Logistic回归分析结果显示,分化程度、PD-1基因rs2227982位点多态性、rs7421861位点多态性与胃癌患者铂类药物化疗敏感性显著相关(P＜0.01).结论 PD-1基因rs2227982、rs7421861位点多态性可能与胃癌患者铂类药物化疗敏感性有关,rs2227982位点携带T等位基因者对铂类药物化疗反应性更好,rs7421861位点携带T等位基因者对铂类药物化疗反应性较差.     

RAD51G135C和XRCC3C241T多态性与急性髓系白血病和骨髓增生异常综合征的发生及其染色体异常相关性研究

目的探索同源重组修复基因RAD51和XRCC3多态性与急性髓系白血病（AML）、骨髓增生异常综合征（MDS）发生及染色体异常之间的关系。方法对306例AML患者、52例MDS患者和458名与患者无血缘关系的正常人，用聚合酶链反应-限制性内切酶片段长度多态性（PCR—RFLP）方法分析RAD51、XRCC3、NQ01基因型，用多重PCR方法检测GSTF1和GSTM1基因型。结果AML患者RAD51G135CG／C基因型比例（35．3％）与正常对照组（26．9％）比较差异有统计学意义（P=0．023），RAD51cmcG／C基因型患AML的相对风险性（OR值）为1．441（95％CI：1．052～1．973）。inV（16）和（或）t（16；16）／CBFB-MYH11（＋）患者，XRCC3G241T，杂合子基因型的比例（41．2％）明显高于正常对照组（10．0％）（P=0．000），XRCC3C241T，杂合子基因型患inv（16）和（或）t（16；16）AML的OR值为6．133（95％CI：2．227—16．887，P=0．000）；且不同基因之间有显著的协同效应，XRCC3C241T，和RAD51G135C同时为变异基因型，0R值增高至8．697，在此基础上同时GSTM1为缺失型，OR值增至12．656，同时NQ01C609-为变异基因型，0R值增至17．091。MDS患者RAD51cⅢc和XRCC3。㈨，各基因型比例与正常对照组比较差异无统计学意义。结论XRCC3C241T，基因型与inv（16）和（或）t（16；16）／CBFB—MYH11（＋）AML发生高度相关，此相关性与XRCC3C241T，和RAD51C135C之间，及与GSTM1和NQ01C509-基因之间存在显著的协同效应。RAD51G135C和XRCC3C241T基因型与MDS发生及MDS染色体异常之间未发现有相关性。     

宁夏汉族人群eNOS基因3个SNP位点与原发性高血压相关性的研究

目的:探讨在宁夏地区汉族人群中eNOS基因3个SNP位点与原发性高血压(EH)的相关性.方法:采用PCR-RFLP方法对204例EH患者及219例健康个体eNOS基因rs2070744(T＞ C)、rs1800780(A＞G)和rs3918181 (A＞ G)共3个SNP位点检测.用x2检验比较病例组-对照组间基因型频率、等位基因频率的差异,用SHEsis在线分析软件分析单倍型 结果:EH组和对照组间,rs1800780位点基因型频率的分布存在显著性差异(P＜ 0.05).rs2070744位点及rs3918181位点基因型频率及等位基因频率的分布均无显著性差异(P＞ 0.05).3个SNP位点共检出8种单倍型,其中单倍型TGA在对照组及EH患者中有统计学差异(P＜0.05),且OR (95％ CI)为1.549 (1.116 ～ 2.150).结论:单倍型TGA的出现可能会增加汉族EH的患病风险.     

RAD51-G135C和XRCC3-C241T单核苷酸多态性与急性髓系白血病发病相关性研究

目的:探讨RAD51-G135C和XRCC3-C241T单核苷酸多态性与急性髓系白血病(AML)发病的相关性。方法:研究分为两组:AML患者组(545例AML患者的外周血样本)和对照组(1 034名与患者无血缘关系的正常人的外周血样本),分别抽提2组基因组DNA,通过Taq Man探针实时荧光定量PCR技术分析RAD51-G135C和XRCC3-C241T基因多态性,并分析两者多态性与急性髓系白血病发病相关性。结果:与对照组相比,RAD51-G135C纯合变异型(CC)可显著增加AML患者的发病风险(OR=3.07),而RAD51-G135C杂合变异型(GC)与AML发病无统计学相关性。XRCC3-C241T纯合变异型(TT)与AML发病尚无统计学相关性,而XRCC3-C241T杂合变异型(CT)却可增加AML患者的发病风险(OR=0.66)。结论:RAD51-G135C纯合变异型和XRCC3-C241T杂合变异型显著增高AML的发病风险,对AML的发病更有预测价值。     

MTHFR基因C677T多态性与心血管疾病相关性的Meta分析

目的 系统评价N5,N10-亚甲四氢叶酸还原酶(methylenetetrahydrofolate reductase,MTHFR)基因677位点单核苷酸多态性(C677T)与心血管疾病易感性的相关性. 方法 计算机检索PubMed、EMbase、Medline、The Cochrane Library、CNKI、VIP及WanFang Data,收集相关人群MTHFR基因C677T多态性与心血管疾病风险的病例-对照研究,检索时限从各数据库建库至2015年7月.按照纳入与排除标准筛选文献、提取资料并评价纳入研究的质量后,用RevMan 5.2软件采用随机效应模型进行Meta分析;Stata 12.0进行敏感性分析和发表偏倚评估. 结果 纳入23个病例-对照研究,合计病例5 835例,对照4 251例.Meta分析结果显示在以下5个遗传模型中合并分析时,均提示MTHFR基因C677T多态性与心血管疾病发病风险的相关性具有统计学意义.等位基因模型(T vs C)[OR=1.39,95％CI(1.17,1.65),P=0.000 2];纯合子模型(TT vs CC)[OR=1.57,95％CI(1.16,2.12),P=0.003];杂合子模型(TC vs CC) [OR=1.69,95％CI(1.26,2.27),P=0.000 4];显性遗传模型(TT+TC vs CC) [OR=1.53,95％CI(1.21,1.94),P=0.000 5];隐性遗传模型(TT vs TC+CC)[OR=1.37,95％CI(1.08,1.73),P=0.01].进行亚组分析时,在以下亚组中显示出更高的发病风险.冠心病组,隐性遗传模型(TT vs TC+CC)[OR=1.38,95％CI(1.17,1.62),P=0.000 1];心肌梗死组,等位基因模型(T vs C)[OR=1.71,95％CI(1.37,2.13),P＜0.000 01];年龄＜50岁组,纯合子模型(TT vs CC)[OR=2.23,95％CI(1.58,3.17),P＜0.000 01]. 结论 MTHFR基因C677T多态性与心血管疾病的发病具有显著相关性;与等位基因C相比,等位基因T可增加心血管疾病风险.     

血管紧张素原基因T174M多态性与原发性高血压相关性的Meta分析

目的:应用Meta分析评价血管紧张素原(AGT)基因T174M多态性与原发性高血压(EH)相关性.方法:检索并筛检数据库中符合纳入AGT基因T174M多态性与EH关系的文献,应用RevMan5.0对结果进行异质性分析和效应值合并,并用Stata11.0评估发表偏倚.结果:共纳入8篇文献,共计1577例EH患者及1383例对照.Meta分析显示,总体人群T174M基因多态性与EH的效应值不具统计学意义.按肤色进行亚组分层分析,黄种人C:T的OR=0.33(95％ CI=0.15～0.73,P＜0.01),CC:TT的OR=0.32(95％CI=0.11 ～0.95,P=0.04),CC+CT:TT的OR=0.62(95％ CI=0.47 ～ 0.81,P＜0.01),在其他人群无统计学意义.结论:黄种人AGT基因T174M多态性的C等位基因及CC基因型能降低患EH风险,在其他人群中相关性尚不明确.     

FTO基因单核苷酸多态性与2型糖尿病发病风险的相关性研究

目的探讨FTO（fatmassandobesityassociated）基因单核苷酸多态性（singlenucleotidepolymorphism,SNP）与中国人群Ⅱ型糖尿病（TypeⅡDiabetesMellitus,T2DM）易感性的关系。方法利用SequenomMassArray。iPLEX系统对238例T2DM患者及239例健康对照的FTO基因单核苷酸多态性位点rs8050136进行基因分型,并对检测结果根据共显性、显性模型、超显性和隐性模型进行x^2检验和非条件Logistic回归分析。结果FTO基因rs8050136位点在病例组和对照组的基因型频率分布差异在显性模型和超显性模型中有显著性（x^2=8．603,P：0．003;x^2=5．428,p=-0．02）。相对CC基因型而言,CA杂合型和CA—AA基因型均能增加T2DM发病的危险陛,（OR=1．751,95％CI：1．129～2．717,P=0．012;0R1．915,95％CI：1．241～2．954,P=0．003）;而磋目间翔塑豁蛳数铆鼬有显著陡差异（x^2=10．614,P=0．001）,相对于C位点而言,A位点是T2DM的危险等位位点,（OR=1．933,95％CI：1．298～2．880,P=0．001）。结论FTO基因单核苷酸多态性rs8050136与T2DM的发病风险相关,CA杂合型和CA—AA基因型可显著增加T2DM的发病风险。     

GSTT1、GSTM1、NQO1、RAD51和XRCC3基因多态性与慢性粒细胞白血病发生关系的研究

目的探讨GSTT1、GSTM1、NQO1、RAD51和XRCC3基因多态性与我国慢性粒细胞白血病(CML)发生遗传易感之间的关系。方法共120例CML患者和458名与患者无血缘关系的正常人,用多重PCR方法检测GSTT1和GSTM1基因型,用PCR-RFLP方法分析RAD51,XRCC3,NQO1基因型。结果CML患者GSTT1和GSTM1缺失型比例分别为50.8%和59.2%,与正常对照组无显著差异(分别为42.8%和53.1%)。CML患者NQO1C/T和T/T基因型的比例(60.0%)、RAD51G135CG/C基因型比例(26.9%)和XRCC3-241Met杂合子缺失型(Thr/Met)的比例(9.2%)均与正常对照组(分别为65.3%,12.4%和9.2%)无统计学差异。结论本研究结果提示GSTT1、GSTM1、NQO1、RAD51和XRCC3基因型与我国CML的发生无显著相关性。     

Single nucleotide polymorphisms in the homologous recombination repair genes and breast cancer risk in Polish women

Genetic polymorphisms in homologous recombination repair genes that can lead to protein haploinsufficiency are generally associated with increased cancer risk. The aim of the present study was to evaluate associations between the risk of breast cancer and single nucleotide polymorphisms in the genes, encoding three key proteins of the homologous recombination repair: RAD51 (the human homologue of the E. coli RecA protein), X-ray repair cross-complementing group (XRCC) 2 and XRCC3. The polymorphisms studied were G135C of the RAD51 gene (c. -98 G>C; rs1801320), Arg188His of the XRCC2 gene (c. 563 G>A; rs3218536), and Thr241Met of the XRCC3 gene (c. 722 C>T; rs861539). Each polymorphism was genotyped by the PCR-RFLP (restriction fragment-length polymorphism) method in 700 Polish female patients with sporadic breast cancer and in 708 cancer-free women, who served as controls. In the present study, we showed the association between RAD51 G135C polymorphism and the incidence of breast cancer (p < 0.0001), but found no significant association with XRCC2 Arg188His or XRCC3 Thr241Met polymorphism. Instead, significant association was identified between XRCC2 Arg188His or XRCC3 Thr241Met polymorphism and breast cancer progression, assessed by the histological grading. However, each of these three polymorphisms was not associated with the tumor size or the lymph node metastases. This study provides evidence that links single nucleotide polymorphisms of RAD51 and XRCC2/3 genes with the risk of breast cancer in Polish women. In conclusion, RAD51 G135C, XRCC2 Arg188His and XRCC3 Thr241Met polymorphisms may be regarded as predictive factors of sporadic breast cancer in female population.     

Influence of cytotoxic T lymphocyte-associated antigen 4 (CTLA4) common polymorphisms on outcome in treatment of melanoma patients with CTLA-4 blockade

Blockade of the cytotoxic T lymphocyte-associated antigen 4 (CTLA-4), a down-regulator of T-cell activation, can cause cancer regression in patients with metastatic melanoma. However, not all patients respond well to the therapy and some develop severe autoimmune reactions. We hypothesized that common genetic variation in the CTLA4 gene could contribute to response to CTLA-4 blockade and the occurrence of autoimmune reactions. We investigated 7 common single nucleotide polymorphisms, SNPs, (rs733618, rs4553808, rs11571317, rs5742909, rs231775, rs3087243, and rs7565213) in 152 white melanoma patients who received CTLA-4 blockade. Three SNPs were associated with response to therapy: proximal promoter SNPs, rs4553808 [P=0.002; odds ratio (OR) 3.39; 95% confidence interval (CI), 1.62-7.10] and rs11571327 (P=0.02; OR 2.89; 95% CI, 1.23-6.83) and the nonsynonymous SNP rs231775 (Thr17Ala, P=0.009; OR 0.39; 95% CI, 0.18-0.82). A haplotype analysis including the 7 SNPs suggested that the common haplotype, TACCGGG could be associated with no response (P=0.02) whereas the haplotype TGCCAGG (P=0.06; OR 4.13; 95% CI, 1.17-14.5) could be associated with response to the treatment. No significant association was observed for occurrence of severe autoimmune reactions (grade III/IV) either by single SNP or haplotype analyses. Our results suggest that genetic variation in CTLA4 could influence response to CTLA-4 blockade therapy in metastatic melanoma patients, but further studies are necessary to confirm the observed associations.     

XRCC1基因多态性与非霍奇金淋巴瘤相关性研究

本研究探讨DNA损伤修复基因X线修复交叉互补基因1（X-ray repair cross complementing group 1,XRCC1）单核苷酸多态性与非霍奇金淋巴瘤（non-Hodgkin＆#39;s lymphoma,NHL）及其亚型发病风险的关系.以282例NHL患者和231例正常对照者为研究对象,采用SNaPshot方法检测XRCC1的3个基因rs25487、rs25489、rs1799782的基因多态性,分析其在NHL患者和正常对照组中基因型和等位基因频率分布的差异,根据遗传隐性、显性和加性模型,采用Logistic回归分析计算各个SNP的等位基因的比值比（Odd ratio,OR）值和95％置信区间（confidence interval,CI）.同时采用Logistic回归分析对3个SNP的组合基因型中各个突变组合基因型进行了比较.结果显示,XRCC1的3个SNP（rs25487、rs25489、rs799782）在NHL患者和正常对照组中基因型和等位频率分布无统计学差异.XRCC1基因7个带有突变的组合基因型相对于参考组合基因型在对照组和NHL患者组患病风险无显著差异.进一步的NHL亚型分析结果显示,对于XRCC1399-280-194基因的突变组合基因型VT-WT-WT相对于参考组合基因型（3种野生型）患T细胞性NHL风险显著降低（OR：0.21;95％ CI（0.06-0.8）;P=0.022）,对于XRCC1399-280-194基因的突变组合基因型WT-VT-WT相对于参考组合基因型患滤泡性型淋巴瘤风险显著增加（OR：15.23;95％ CI（1.69-137.39）;P=0.015）,该结果仍需进一步扩大研究证实.结论：DNA损伤修复基因XRCC1的3个SNP（rs25487、rs25489、rs1799782）基因多态性与NHL及其亚型的发病无明显相关性.XRCC1的3个SNP突变组合基因型与NHL的发病无明显相关性,XRCC1的3个SNP突变组合基因型对NHL不同亚型发病风险的影响仍需进一步扩大研究证实.     

Association of transforming growth factor-beta1 gene polymorphisms with genetic susceptibility to nasopharyngeal carcinoma

BACKGROUND: Nasopharyngeal cancer (NPC) is multifactorial, and the genetic background may be a crucial etiologic factor. Transforming growth factor-beta1 (TGF-beta1) is a multifunctional cytokine, it promotes tumor growth and metastasis in later stages of phase of cancer development. Variations in the DNA sequence in the TGF-beta1 gene may lead to altered TGF-beta1 production and/or activity, and so this can modulate an individual's susceptibility to NPC. To test this hypothesis, we investigated the association of the TGF-beta1 polymorphisms and their haplotypes with the risk of NPC in a Chinese population. METHODS: We analyzed 2 single nucleotide polymorphisms (SNPs) of TGF-beta1 gene promoter -509C/T and 869T/C (Leu10Pro) at exon one in 108 patients with NPC and 120 age- and sex-matched controls in a Chinese population, using a polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) strategy. RESULTS: There were significant differences in the genotype and allele distribution of -509C/T and 869T/C (Leu10Pro) polymorphisms of the TGF-beta1 gene among cases and controls. The -509T and 869C alleles carriers were associated with a significantly increased risk of NPC as compared with the non-carriers (OR=1.64, 95% CI, 1.13-2.39, P=0.009 and OR=1.70, 95% CI, 1.17-2.46, P=0.006, respectively). Consistent with the results of the genotyping analyses, the -509T/869C haplotype was associated with a significantly increased risk of NPC as compared with the -509C/869T haplotype (OR=1.68; 95% CI, 1.14-2.48; P=0.009). CONCLUSION: TGF-beta1 -509C/T and 869T/C polymorphisms, and their haplotypes are significantly associated with the risk of NPC. Our data suggests that TGF-beta1 -509C/T and 869T/C polymorphisms could be used as genetic susceptibility markers of the NPC.     

Association between ESR2 genetic variants and risk of myocardial infarction

BACKGROUND: Environmental and genetic factors contribute to the development of complex diseases such as myocardial infarction (MI), the leading cause of death in men and women. Women develop MI approximately 10 years later than men, a difference that could be explained by the genes coding for the estrogen receptors. Single nucleotide polymorphisms (SNPs) in the ESR2 gene may affect susceptibility for MI in a sex-dependent manner. METHODS: A nested case-control design was used to analyze 3 polymorphisms of the ESR2 gene and their associated haplotypes in 710 myocardial infarction cases from the REGICOR (Registre Gironí del Corazón) study and 2379 controls randomly selected in a representative population of a Spanish cross-sectional study. RESULTS: The rs1271572 T allele was significantly more common in patients who developed MI (P < 0.001). No association was observed for rs1256049 or rs4986938. Assuming a dominant model of inheritance, the association, as determined by logistic multivariate regression after adjustment for conventional cardiac risk factors, remained statistically significant in men [odds ratio (OR) 1.65, 95% CI 1.18-2.30; P = 0.003) but not in women (P = 0.754). A very common haplotype encompassing the rs1271572 variant was also associated with the risk of MI in the overall population (OR 1.41, 95% CI 1.06-1.87; P = 0.020) and in men (OR 1.57, 95% CI 1.12-2.21; P = 0.009). CONCLUSIONS: The rs1271572 SNP T variant was associated with increased risk of MI in a Spanish population, and this association was found to be limited to men only. Sex differences in the genetic risk merit further investigation.     

环氧合酶2基因单核苷酸多态性与慢性阻塞性肺疾病相关性研究

目的 探讨环氧合酶2(cyclooxygenase-2,COX-2)基因单核苷酸多态性(single nucleotide polymorphisms,SNP)位点-765G/C(rs20417)与常州地区汉族人群中慢性阻塞性肺疾病(chronic obstructive pulmonary disease,COPD)易感性的关系.方法 采用病例对照研究方法,分别收集常州地区汉族人群中COPD患者138例和健康对照组83例的抗凝全血标本,用3S血液基因组DNA抽提试剂盒提取全血DNA,运用聚合酶链反应(polymerase chain reaction,PCR)扩增COX-2基因的相关片段,PCR产物直接进行DNA测序分析,测序结果在Genbank基因库中进行序列比较.结果 ①病例组rs20417位点的GG、GC基因频率分别为94.2%(130/138),5.8%(8/138),与对照组84.3%(70/83),15.7%(13/83) 比较,差异有统计学意义(χ2=5.866,P<0.05),病例组和对照组均未检测到CC基因型;②COX-2基因rs20417位点不同基因型的COPD发生相对危险度比较,病例组C等位基因频率2.9%(8/276)显著低于对照组7.8%(13/166),差异有统计学意义(P＜0.05),携带突变等位基因C的个体COPD易感性显著降低(OR=0.351,95%CI=0.142~0.867,P<0.05).结论 在中国常州地区汉族人群中,COX-2基因 rs20417位点SNP可能与COPD的易感性有关,携带 G/C基因型个体可能会降低COPD的易感性,C等位基因可能是COPD的保护性基因.     

Polymorphisms in genes involved in DNA repair and metabolism of xenobiotics in individual susceptibility to sporadic diffuse gastric cancer.

BACKGROUND: Gastric cancer is the second highest cause of cancer mortality in the world, despite declining rates of incidence in many industrialized countries. We carried out a case-control study to evaluate whether polymorphisms of DNA repair and glutathione S-transferase (GST) genes modulate the risk of developing diffuse gastric cancer. METHODS: ERCC1 118 T/C, XRCC1 399 G/A, XPD 312 G/A, XPD 751 A/C, XRCC3 241 C/T, MS 919 A/G, GSTP1 105 A/G, GSTM1-null/positive and GSTT1-null/positive genotypes were obtained for a series of 126 Helicobacter pylori-negative diffuse gastric cancer patients and 144 Helicobacter pylori-negative controls sampled from the population of Marche, an area with high gastric cancer risk in central Italy. RESULTS: GSTP1 105 A/G and GSTP1 105 G/G genotypes were identified as protective factors, with odds ratio (OR) of 0.4 (95% CI 0.17-0.81, p=0.01) and OR=0.58 (95% CI 0.33-1, p=0.05), respectively. GSTT1-null genotype was identified as a protective factor, with OR=0.48 (95% CI 0.22-0.99, p=0.04). There was no significant difference between cases and controls for XPD 751 A/C, ERCC1 118 T/C, XRCC3 241 C/T, XRCC1 399 G/A, XPD 312 G/A, GSTM1-null/positive and MS 919 A/G polymorphisms. CONCLUSIONS: This study suggests that GSTP1 105A/G and GSTT1-null/positive genotypes might be associated with a reduced risk for sporadic diffuse gastric cancer. Clin Chem Lab Med 2007;45:822-8.     

STAT3及XRCC4基因多态性与肝细胞癌易感性的关系研究

目的：探讨转录激活因子3（STAT3）及X线修复交叉互补基因4（XRCC4）基因多态性与中国人群肝细胞癌（HCC）易感性的关系。方法采用病例对照研究,以确诊的200例乙型肝炎病毒（HBV）感染相关 HCC 为肝癌组,207例性别及年龄匹配的 HBsAg阳性患者为非肝癌组。采用PCR-限制性长度多态性技术检测STAT3 rs2292152和XRCC4 rs1805377多态性位点的基因型,Logistic回归分析比较不同基因型与 HCC易感风险的关系。结果（1）STAT3 rs2293152位点3种基因型（CC、CG和GG型）在肝癌组分布频率分别为17％（34／200）、49．5％（99／200）和33．5％（67／200）,在非肝癌组中分别为18．4％（38／207）、56．5％（117／207）和25．1％（52／207）,各基因型在两组之间的差异无统计学意义（P＞0．05）;以CC基因型作参照,携带rs2293152 GG型的个体 HCC患病风险差异无统计学意义（OR＝1．440,95％ CI＝0．800～2．592,P＝0．224）。（2）XRCC4 rs1805377位点3种基因型（AA、GA和GG 型）在肝癌组分布频率分别为61％（122／200）、30％（60／200）和9％（18／200）,在非肝癌组中分别为59．9％（124／207）、31．9％（66／207）和8．2％（17／207）,各基因型在两组之间的差异无统计学意义（P＞0．05）;以 AA 基因型作参照,携带rs1805377 GG型的个体 HCC 患病风险差异无统计学意义（OR＝1．076,95％ CI＝0．530～2．185,P＝0．839）。结论 STAT3 rs2292152和XRCC4 rs1805377多态性位点可能与中国人群HBV 相关HCC 易感性无密切关系。