CDH1 C-160A基因多态性与胃癌易感性的Meta分析

目的:探讨CDH1 C-160A基因多态性与胃癌易感性的关系.方法:检索中国生物医学文献数据库、万方数据库、中国期刊网和PubMed,获取CDH1C-160A基因多态性与胃癌易感性的病例-对照研究.以胃癌组与对照组人群基因型分布的OR值为效应指标,采用固定或随机效应模型进行合并分析,并进行偏倚评估.应用STATA10.0软件进行统计学处理.结果:共纳入文献13篇,研究14项,累计胃癌病例3 144例,对照4 221例.与野生基因型CC相比,(CA+AA)合并的OR值(95%CI)为0.98(0.84-1.15).按人群进行分层分析,亚洲人群OR值为0.92(0.81-1.04),高加索人群OR值为1.21(0.88-1.67).结论:CDH1 C-160A基因多态性与胃癌易感性无关.     

中国藏族PSCA基因rs2294008多态性与胃癌遗传易感性的关系

目的:研究前列腺干细胞抗原基因(prostatestem cell antigen gene,PSCA)rs2294008位点多态性与中国藏族胃癌患者遗传易感性的关系.方法:收集185例藏族胃癌患者与200例健康人群的外周血样本,提取基因组DNA,采用dHPLC方法进行PSCA基因rs2294008位点分型.结果:PSCA基因rs2294008位点3种基因型C C、C T、T T在胃癌病例组中频率分别为:40.00%、48.65%和11.35%,而在对照组中分别为54.00%、39.50%和6.50%.与CC型比较,携带CT,TT型基因型者胃癌发生的危险性增加,OR值分别为1.66(95%CI 1.09-2.54)和2.36(95%CI 1.11-5.00).结论:PSCA基因rs2294008位点CT,TT基因型增加中国藏族人群的胃癌易感性.     

白细胞介素-17F A7488G多态性与广东地区胃癌的关系

目的 分析白细胞介素(IL)-17F A7488G(p.His161Arg)多态性与广东地区胃癌遗传易感性及其与胃癌患者临床病理学特征和预后的关系.方法 采用聚合酶链反应-跟制性片段长度多态性(PCR-RFLP)法分析927例胃癌患者及777名健康对照者的IL-17F A7488G多态性,采用Logistic回归法和Cox比例风险法研究其对不同临床病理学特征的胃癌发病风险的影响并进行生存分析.结果 IL-17F A7488G基因型频率在胃癌患者与健康对照人群间差异有统计学意义(X2=16.55,P<0.01).与AA纯合子相比,IL-17F A7488G杂合变异基因型(GA)及纯合变异基因型(GG)显著增加胃癌的发病风险,OR值分别为1.51和1.61(95%CI分别为1.22～1.87和1.03～2.51,P值均<0.01).与AA携带者相比,携带G(GA或GG)等位基因者发生胃癌的风险显著增加(OR=1.53,95%CI:1.25～1.87,P<0.01).按临床病理特征行分层分析显示,IL-17F A7488GGA基因型与肠型、低中分化、非贲门癌、淋巴结转移等的发病风险增加有关.IL-17F A7488G不同基因型患者间生存率差异无统计学意义(P=0.534).结论 广东地区IL-17F A7488G多态性与胃癌易感性有关,IL-17F A7488G变异基因型增加胃癌的发病风险,但不是影响胃癌患者预后的危险因素.     

The PSCA polymorphisms derived from genome-wide association study are associated with risk of gastric cancer: a meta-analysis

Purpose

Prostate stem cell antigen (PSCA) is a glycosylphosphatidylinositol-anchored 123-aa protein related to the cell-proliferation inhibition and/or cell-death induction activity. Many studies had reported the role of PSCA rs2294008 C?>?T and rs2976392 G?>?A polymorphisms on gastric cancer risk.

Methods

To investigate a more precise estimation of the relationships, we performed a meta-analysis on 9 case–control studies included 10,746 cases and 9,158 controls. Odds ratios (ORs) and 95?% confidence intervals (CIs) were used to assess the strength of the association.

Results

For PSCA rs2294008 C?>?T polymorphism, there was a significantly increased risk of gastric cancer in all genetic models (TT/TC vs. CC: OR?=?1.61, 95?% CI?=?1.35–1.91; TT vs. TC/CC: OR?=?1.33, 95?% CI?=?1.24–1.42). Similar results were also observed for PSCA rs2976392 G?>?A polymorphism (AA/AG vs. GG: OR?=?1.69, 95?% CI?=?1.24–2.31; AA vs. AG/GG: OR?=?1.36, 95?% CI?=?1.24–1.50). In the stratified analysis by ethnicity of rs2294008, an increased gastric cancer risk was found in both Asians (TT vs. TC/CC: OR?=?1.31, 95?% CI?=?1.22–1.42) and Europeans (TT/TC vs. CC: OR?=?1.42, 95?% CI?=?1.18–1.71). Furthermore, when stratified by clinicopathologic characteristics of tumor location and histology, a higher risk on non-cardia compared with cardia gastric cancer (TT vs. TC/CC: OR?=?1.43, 95?% CI?=?1.12–1.83) as same as diffused compared with intestinal gastric cancer (TT vs. TC/CC: OR?=?1.29, 95?% CI?=?1.13–1.49) was observed.

Conclusion

These findings supported that PSCA rs2294008 C?>?T and rs2976392 G?>?A polymorphisms may contribute to the susceptibility to gastric cancer, particular in non-cardia or diffused gastric cancer.     

Association between gastric cancer and -1993 polymorphism of TBX21 gene

AIM: To investigate the association between the polymorphism of TBX21 gene and the risk of gastric cancer in a Chinese population.METHODS: The -1993 polymorphism located in TBX21 gene promoter region was identified by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method. The risk between TBX21 gene genotype and gastric cancer was determined by multivariate logistic regression analysis in 220 gastric cancer patients and 262 cancer-free controls matched by age, sex and ethnicity.RESULTS: Compared with the TBX21 -1993TT genotype, the -1993CC genotype exhibited a significantly elevated risk for gastric cancer [Odds ratio (OR) = 3.42, 95% confidence interval (CI): 1.41-8.31]. The relationship between the -1993 polymorphic genotype and the invasive status such as lymph node and distant metastasis was found among the gastric cancer patients (OR = 4.02, 95% CI: 1.87-8.66; OR = 7.02, 95% CI: 3.44-14.34, respectively).CONCLUSION: TBX21 -1993 polymorphism might contribute to the risk of gastric cancer, especially to the distant metastasis.     

血管内皮生长因子-460C/T基因多态性与非贲门胃癌的关系

目的探讨VEGF-460C/T基因多态性与非贲门胃癌的关系。方法研究人群为胃癌(包括胃体癌及胃窦癌)患者159例,对照组为非溃疡性消化不良患者162例。应用聚合酶链反应和限制性片段长度多态性(PCR-RFLP)技术对VEGF-460C/T基因位点多态性进行基因分型,比较病例组与对照组基因型分布及其与临床病理特征的关系。结果 VEGF-460位点CC、CT和TT基因型在病例组中的频率分别为3.2%、35.2%、61.6%,在对照组中的频率分别为8.0%、48.2%、43.8%,基因型在两组分布显著不同(χ2=11.454,P=0.003)。TT纯合子在胃癌组分布较对照组明显增高,TT型患胃癌风险是CC型的3.58倍[OR=0.279,95%可信区间(CI):0.095～0.817],是CT型的1.9倍[OR=0.52,95%CI:0.329～0.824]。进一步分析表明携带T等位基因患胃癌的相对危险度是携带C等位基因的1.8倍[OR=0.55,95%CI:0.387～0.792]。基因型分布与临床分期和病理分级未见显著性差异。结论 VEGF-460C/T基因多态性T等位基因可作为胃癌易感性的预测指标,但不能作为预后预测指标。     

Inducible nitric oxide synthase polymorphism is associated with the increased risk of differentiated gastric cancer in a Japanese population

INTRODUCTION Gastric cancer is the second most frequent cancer in the world, accounting for a large proportion of cancer cases in Asia, Latin America, and some countries in Europe[1]. H pylori strains carrying the cytotoxin-associated gene A (cagA) are st…     

CD14及Toll样受体4基因多态性与大肠癌的相关性研究

目的探讨我国湖北汉族人Toll样受体（TLR）4基因Asp299Gly和CD14 C-260T基因多态性分布与大肠癌的相关性。方法采用聚合酶链反应限制性片段长度多态性（PCR—RFLP）方法，检测110例大肠癌患者及160例正常对照者TLR4基因Asp299Gly及CD14 C-260T基因型及等位基因频率的分布。结果大肠癌组CD14 C-260T基因型与正常对照组比较，差异有统计学意义（P〈0．05）。正常对照组CC基因型的频率为15．6%，明显低于大肠癌组的31．8％（P=0．0027，OR=0．3968，95％CI=0．2209～0．7129）；正常对照组中CT基因型的频率为48．1％，明显高于大肠癌组的30．9％（P=0．0056，OR=2．074，95%CI=1．246～3．452）。所有样本中均未发现TLR4基因Asp299Gly的突变型。结论CD14 C-260T基因多态性与中国湖北汉族大肠癌显著相关，而TLR4基因Asp299Gly多态性与大肠癌无关。     

Association of CD14/-260 polymorphism with gastric cancer risk in Highland Tibetans

AIM:To investigate the relationship between CD14-260and-651 polymorphisms and the risk of developing gastric cancer.METHODS:DNA was extracted from peripheral blood samples obtained from 225 Tibetans with gastric cancer and 237 healthy Tibetans,and analyzed using the polymerase chain reaction/ligase detection(PCR/LDR)method to determine the genotypes at-260 and-651loci of the CD14 promoter.The allele frequencies,genotype frequencies,and haplotypes were analyzed for their association with gastric cancer risk using online SHEsis software.The luciferase reporter assay and point mutation analysis were used to construct in vitro plasmids expressing a C/T homozygote at the-260 lo-cus of the CD14 promoter.RESULTS:The frequencies of CC,CT and TT genotypes in the CD14-260 C/T locus in gastric cancer patients were 19.1%,38.7%and 42.2%,respectively,whereas they were 33.3%,32.5%and 34.2%,respectively,in healthy control subjects.CT genotype carriers were more frequently found among gastric cancer patients than healthy controls(OR=2.076;95%CI:1.282-3.360).Also,TT genotype carriers were more frequently found among gastric cancer patients(OR=2.155;95%CI:1.340-3.466).Compared to the C allele of CD14/-260,the T allele was associated with an increased risk for gastric cancer(OR=1.574;95%CI:1.121-2.045).Furthermore,the frequencies of CC,CT and TT in the CD14-651 C/T locus in gastric cancer patients were 64.4%,29.3%and 6.2%,respectively,while they were 56.5%,35.0%and 8.4%,respectively,in the healthy control subjects(P>0.05).Data obtained using the luciferase reporter assay showed that the p260T homozygote was associated with greater CD14 promoter activity(P<0.01).CONCLUSION:CD14/-260 polymorphism is associated with gastric cancer risk in Highland Tibetans and affects CD14 promoter activity,thereby regulating CD14expression.     

GG genotype of cyclin D1 G870A polymorphism is associated with non-cardiac gastric cancer in a high-risk region of China

Objective. Cyclin D1 (CCND1) is a regulatory protein involved in the cell cycle of both normal and neoplastic cells. Polymorphism of this gene at codon 242 in exon 4 (A870G) has an impact on the risk of several human cancers. The purpose of this study was to study the relation between the CCND1 A870G gene polymorphism and the risk of non-cardiac gastric cancer in a Chinese population. Material and methods. The study population consisted of 159 patients with non-cardiac gastric cancer and 162 cancer-free controls. CCND1 870A/G polymorphism was genotyped by a polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) assay and sequencing. Results. CCND1 genotype distribution among the patients was significantly different from that among controls; AA (odds ratio (OR)=0.348, 95% CI: 0.163–0.742) and GA (OR=0.715, 95% CI: 0.506–1.012) genotypes were significantly lower in the gastric cancer patients than in the controls when subjects with the GG genotype served as the reference category. In other words, the risk of gastric cancer for subjects with the GG genotype was 2.8 times that of subjects with the AA genotype, and 1.4 times that of subjects with the GA genotype. Furthermore, in the stratification analyses, the risk of GG genotype was more evident in subjects ≥60 years of age and those positive for Helicobacter pylori (H. pylori) infection. Conclusions. The CCND1870 GG genotype is associated with an increased risk for non-cardiac gastric cancer in patients in a high-risk area of China. Larger studies with multiple polymorphisms are needed to verify this finding and the function of this polymorphism needs to be further investigated.     

Methylenetetrahydrofolate reductase C677T and A1298C polymorphisms and gastric cancer susceptibility

AIM: To identify the association between methylenetetrahydrofolate reductase (MTHFR) polymorphisms and gastric cancer (GC) susceptibility.METHODS: Systematic searches were performed on the electronic databases PubMed, ISI, Web of knowledge, CNKI and Wanfang, as well as manual searching of the references of the identified articles. A total of 26 papers were included in this meta-analysis. Overall and subgroup analyses were performed. Odds ratio (OR) and 95%CI were used to evaluate the associations between MTHFR polymorphisms and GC risk. The I² statistics were used to evaluate between-study heterogeneity. Sensitivity analysis was also performed.RESULTS: Increased risk was found for the MTHFR C677T polymorphism under four genetic models (TT + CT vs CC: OR = 1.23, P = 0.002; T vs C: OR = 1.15, P = 0.001; TT vs CC: OR = 1.37, P = 0.0005; TT vs CT + CC: OR = 1.17, P = 0.0008). Subgroup analysis by ethnicity suggested that C677T polymorphism conferred a risk of GC in eastern but not in western populations. Stratification by tumor site showed an association between the C677T polymorphism and gastric cardia cancer and non-cardia GC in the worldwide population and in eastern populations. Regardless of comparisons with controls or diffuse-type GC, a positive association was found for the C677T polymorphism and an increased risk of intestinal-type GC in the whole population and in western populations. With regard to the A1298C polymorphism, we found that genotype CC was significantly decreased and conferred protection against GC in eastern populations (CC vs AA: OR = 0.44, P = 0.03; CC vs AC + AA: OR = 0.46, P = 0.04).CONCLUSION: MTHFR C677T polymorphism is a risk factor for GC, and the A1298C polymorphism may be a protective factor against GC in eastern populations.     

RUNX3基因rs2236852多态性与胃癌的关系

背景:Runt相关转录因子3(RUNX3)基因多态性与亚洲人群胃癌的发生相关。目的:初步探讨RUNX3基因rs2236852多态性与中国汉族人群胃癌发病风险之间的关系。方法:选取2011年3月～2013年4月青岛大学医学院附属青岛市市立医院确诊的310例胃癌患者,以327名健康者作为对照。采用DNA直接测序法检测RUNX3rs2236852位点基因型,并分析其与胃癌发病风险之间的关系。结果:胃癌组RUNX3 rs2236852基因型分布频率与对照组相比差异有统计学意义(P<0.05)。与AA基因型相比,GG基因型能显著增加胃癌的发病风险(OR=2.46,95%CI:1.60～3.78);AG基因型可增加胃癌发病风险,但差异无统计学意义(OR=1.58,95%CI:0.99～+2.54)。结论:RUNX3 rs2236852位点GG基因型可能与中国汉族人群的胃癌发病有关。     

hTERT基因多态性与胃癌易感性的研究

人端粒酶逆转录酶(hTERT)作为端粒酶的关键酶参与了包括胃癌在内的多种肿瘤的发生和发展,有研究发现该基因的多个单核苷酸多态性(SNP)位点与多种恶性肿瘤具有不同程度的相关性。目的:探讨hTERT基因rs2853676和rs2853677位点SNP与胃癌遗传易感性的关系。方法:采用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)法检测297例胃癌、105例萎缩性胃炎和402例对照组患者rs2853676和rs2853677位点的基因多态性,采用病理学检查和~(13)C-尿素呼气试验检测幽门螺杆菌(Hp)感染。结果:胃癌组rs2853676位点AA基因型频率显著高于对照组(15.2%对6.5%,P=0.01),AA基因型携带者患胃癌的风险增加2.47倍(95%CI:1.46~4.16)。三组rs2853677位点CC、TC、TT基因型频率差异无统计学意义。与对照组相比,萎缩性胃炎组和胃癌组Hp感染率显著升高(64.8%、56.9%对40.3%,P均0.01),OR值分别为2.73(95%CI:1.74~4.26)、1.96(95%CI:1.44~2.67)。Logistic回归分析发现,Hp感染与基因突变无明显交互作用。结论:hTERT基因rs2853676基因多态性与胃癌遗传易感性有关,其增加胃癌的风险与Hp感染可能无关。     

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.     

CTLA-4基因启动子区-1661和-318位点多态性与胃癌的关系

细胞毒性T淋巴细胞相关抗原4（CTLA-4）是一种免疫调节分子,可通过降低T细胞活性,抑制机体的抗肿瘤免疫反应。目的：探讨CTLA-4基因启动子区-1661和-318位点多态性与胃癌的关系。方法：121例无血缘关系的胃癌患者和236名正常对照者纳入研究,分别采用聚合酶链反应一限制性片段长度多态性（PCR—RFLP）和扩增不应突变系统（ARMS）。PCR检测CTLA-4基因启动子区-1661和．318位点多态性。结果：胃癌组．1661位点AA基因型和A等位基因频率显著低于正常对照组（73．6％对83．9％,P=0．024;85．1％对91．1％,P=0．022）;而-318位点CC基因型和C等位基因频率与正常对照组相比无明显差异。管状腺癌患者CTLA-4基因启动子区-1661位点AA基因型和．318位点CC基因型频率显著低于正常对照组（64．1％对83．9％,P=0．001;76．6％对87．3％,P=0．047）。结论：CTLA-4基因启动子区-1661位点基因多态性与胃癌呈显著负相关,-1661和-318位点多态性与管状腺癌呈显著负相关。     

细胞周期素D1基因多态性与胃癌关系的研究

目的 研究与肿瘤发生有关的细胞周期蛋白D1(CCND1)870A/G基因多态性与胃癌易感性的关系.方法 收集106例胃癌病例(包括胃体癌及胃窦癌)和108例非溃疡性消化不良患者的外周血白细胞,采用病例对照分子流行病学研究方法 ,以聚合酶链反应-限制性片段长度多态性(PCR-RFLP)技术,进行CCND1基因型检测.结果 在病例组和对照组中CCND1 870位点野生型GG频率分别为19.8%和7.4%,携带AA基因型个体发生胃癌危险是携带GG型个体的0.28倍(P＜0.05,OR=0.281),即GG型个体更易感胃癌.分层分析表明,携带GG基因型个体分别在男性、年龄≥60岁及幽门螺杆菌感染亚组中患胃癌风险更高.结论 在中国胃癌高发区西安,CCND1 870A/G位点GG基因型人群更易感胃癌.     

Selenoprotein S (SEPS1) gene -105G>A promoter polymorphism influences the susceptibility to gastric cancer in the Japanese population

Background

Inflammation is a key factor in the process of carcinogenesis from chronic gastritis induced by Helicobacter pylori. Selenoprotein S (SEPS1) is involved in the control of the inflammatory response in the endoplasmic reticulum (ER). Recently the -105G>A polymorphism in the promoter of SEPS1 was shown to increase pro-inflammatory cytokine expression. We examined the association between this polymorphism and the risk of gastric cancer.

Methods

We took stomach biopsies during endoscopies of 268 Japanese gastric cancer patients (193 males and 75 females, average age 65.3), and 306 control patients (184 males and 122 females, average age 62.7) and extracted the DNA from the biopsy specimens. All subjects provided written informed consent. For the genotyping of the SEPS1 promoter polymorphism at position -105G>A, PCR-RFLP methods were used and the PCR products were digested with PspGI. Logistic-regression analysis was used to estimate odds ratios (OR) and 95% confidence intervals (CI), adjusting for age, sex, and H. pylori infection status.

Results

Among cases, the distribution of genotypes was as follows: 88.4% were GG, 11.2% were GA, and 0.4% were AA. Among controls, the distribution was as follows: 92.5% were GG, 7.2% were GA, and 0.3% were AA. Among males, carrying the A allele was associated with an increased odds of gastric cancer, compared with the GG genotype (OR: 2.0, 95% CI 1.0–4.1, p = 0.07). Compared with the GG genotype, carrying the A allele was significantly associated with increased risks of intestinal type gastric cancer (OR: 2.0, 95%CI 1.0–3.9, p < 0.05) as well as of gastric cancer located in the middle third of the stomach (OR: 2.0, 95%CI 1.0–3.9, p < 0.05).

Conclusion

The -105G>A promoter polymorphism of SEPS1 was associated with the intestinal type of gastric cancer. This polymorphism may influence the inflammatory conditions of gastric mucosa. Larger population-based studies are needed for clarifying the relation between inflammatory responses and SEPS1 polymorphism.     

Multi-drug resistance 1 polymorphism is associated with reduced risk of gastric cancer in the Japanese population

BACKGROUND AND AIMS: Host genetic factors play a key role in gastric carcinogenesis, but the mechanism has not been clarified. The multi-drug resistance 1 (MDR1) gene mediates the expression of P-glycoprotein, which has a role in active transport of various substrates, including xenobiotics, and thus has a protective function in various tissues and organs like gastrointestinal epithelial cells. C3435T polymorphism in exon 26 of the MDR1 gene influences P-glycoprotein expression and activity in the gastrointestinal tract. We investigated the influences of MDR1 gene polymorphism on the risk of gastric cancer. METHOD: The study was performed on 157 patients with gastric cancer (GC) and 104 patients without GC as the control group. C3435T polymorphism of MDR1 was investigated by PCR-RFLP in all of the patients. RESULTS: The MDR1 3435 TT genotype showed a significantly higher frequency in controls than in GC patients (OR = 0.43; 95% CI = 0.23-0.79). There were no significant differences of the CT and CC genotype frequencies between GC patients and controls. We also found that the 3435TT genotype of MDR1 was associated with a lower risk of non-cardiac cancer (OR = 0.42; 95% CI = 0.23-0.79), middle-third cancer (OR = 0.36; 95% CI = 0.17-0.77), advanced cancer (OR = 0.31; 95% CI = 0.13-0.73), venous invasion (OR = 0.30; 95% CI = 0.10-0.91), and lymph node metastasis (OR = 0.28; 95% CI = 0.13-0.65). CONCLUSION: Our data suggest that 3435T/T polymorphism of MDR1 is associated with a reduced risk of gastric cancer in the Japanese population.     

东北地区汉族人群DNA修复基因XPD单核苷酸多态性与胃癌的相关性

目的:研究核苷酸切除修复基因XPD单核苷酸多态性与东北地区汉族人群胃癌风险的关系.方法:以聚合酶链反应-限制性片段长度多态性方法分析了238例胃癌患者标本XPD基因Asp312Asn和Lys751Gln多态性,比较不同基因型与胃癌风险的关系.结果:Lys751Gln多态在胃癌患者中的分布和正常对照组差异不显著,与胃癌风险无关.胃癌患者中Asp/Asn和Asn/Asn基因型频率明显高于正常对照组(P=0.041);与携带312Asp/Asp基因型者比较,携带至少1个312Asn等位基因者(即Asp/Asn和Asn/Asn基因型)罹患胃癌的风险增加1.901倍(95%CI:1.119-3.229).结论:XPD基因Asp312Asn多态是东北地区汉族人群胃癌遗传易感因素.