运用Meta分析的方法综合评价低密度脂蛋白受体相关蛋白基因（low density lipoprotein receptor-related protein 1 gene，LRP-1）第三外显子C766T多态性与阿尔茨海默氏病（Alzheimer’s disease，AD）发病风险的关系。通过检索Medline...运用Meta分析的方法综合评价低密度脂蛋白受体相关蛋白基因（low density lipoprotein receptor-related protein 1 gene，LRP-1）第三外显子C766T多态性与阿尔茨海默氏病（Alzheimer’s disease，AD）发病风险的关系。通过检索Medline、Cochrane图书馆和中国生物医学文献数据库（OBM），纳入内容涉及LRP-1基因C766T多态性的基因型频率和（或）等位基因频率的独立病例对照研究。各文献满足研究方法相似，有综合的统计指标。研究年限为1997-2004年。语种不限。应用RevMan4.2软件进行统计分析。在AD组3764例和对照组3647例研究对象中，分别对基因型和等位基因频率做合并统计。各研究之间有显著的异质性，P〈0．01，故采用随机效应模型分析合并结果。总体效应检验未发现CC基因型频率在病例对照之间统计学上的差异（Z=1．74，P=0．08，OR=1．17，95％CI：0．98-1．39），C等位基因频率在病例对照之间也未发现差异（Z=1．31，P=0．19，OR=1．11，95％CI．0．95—1．31）。Meta分析结果提示，LRP-1基因C766T多态性不是AD的主要风险因子，但尚不能完全排除其可能在AD发病中具有微弱的作用。展开更多
Objective MicroRNA plays a vital role in gene expression, and microRNA dysregulation is involved in carcinogenesis. The miR- 196a-2 polymorphism rs11614913 is reportedly associated with cancer susceptibility. This met...Objective MicroRNA plays a vital role in gene expression, and microRNA dysregulation is involved in carcinogenesis. The miR- 196a-2 polymorphism rs11614913 is reportedly associated with cancer susceptibility. This meta-analysis was performed to assess the overall association of miR-196a-2 with cancer risk. Methods A total of 27 independent case-control studies involving 10,435 cases and 12,075 controls were analyzed for the rs11614913 polymorphism. Results A significant association was found between rs11614913 polymorphism and cancer risk in four genetic models （CT vs. TT, OR-1.15, 95%CI=1.05-1.27; CC vs. TT, OR=1.23, 95%CI=1.08-1.39; Dominant model, OR=1.17, 95%CI=1.06-1.30; Additive model, OR-1.08, 95%CI=1.01-1.14）. In the subgroup analysis of different tumor types, the C allele was associated with increased risk of lung, breast, and colorectat cancer, but not with liver, gastric, or esophageal cancer. In the subgroup analysis by ethnicity, a significantly increased risk of cancer was found among Asians in all genetic models, but no associations were found in the Caucasian subgroup. Conclusions The meta-analysis demonstrated that the miR-196a-2 polymorphism is associated with cancer susceptibility, especially lung cancer, colorectal cancer, and breast cancer among Asian populations.展开更多
AIM： To perform a systematic meta-analysis to in- vestigate the association between X-ray repair crosscomplementing group 1 （XRCC1） polymorphisms and hepatocellular carcinoma （HCC） risk. METHODS： Relevant studie...AIM： To perform a systematic meta-analysis to in- vestigate the association between X-ray repair crosscomplementing group 1 （XRCC1） polymorphisms and hepatocellular carcinoma （HCC） risk. METHODS： Relevant studies extracted from PubMed, Embase, Wanfang, VIP and the Chinese National Knowledge Infrastructure databases up to March 2012 were included in the study. Stata software, version 11.0, was used for the statistical analysis. The odds ratios （ORs） and 95% confidence interval （CI） of the XRCC1 polymorphisms in HCC patients were analyzed and compared with healthy controls. The meta-analysis was performed using fixed-effect or random-effect methods, depending on the absence or presence of significant heterogeneity. RESULTS： Eleven studies with 2075 HCC cases and 2604 controls met our eligibility criteria （four studies, 888 cases and 938 controls for Arg194Trp, four studies, 858 cases and 880 controls for Arg280His, and nine studies, 1845 cases and 2401 controls for Arg399Gln）. The meta-analysis revealed no associations between the Arg194Trp and Arg399GIn polymorphisms of the XRCC1 gene and HCC risk under all contrast models （codominant, dominant and recessive models） in the overall analysis and sensitivity analysis （the studies with controls not in the Hardy-Weinberg equilibrium were excluded）. For XRCC1 Arg280His polymorphism, the overall analysis revealed the significant associa- tion between the His/His genotype and the increased risk of HCC （His/His vs Arg/Arg model, OR： 1.96, 95% CI： 1.03-3.75, P = 0.04）. However, sensitivity analysis showed an altered pattern of result and non-significant association （OR： 2.06, 95% CI： 0.67-6.25, P = 0.20）. The heterogeneity hypothesis test did not reveal any heterogeneity, and Begg＇s and Egger＇s tests did not find any obvious publication bias. CONCLUSION： The XRCC1 Arg194Trp and Arg399GIn polymorphisms are not associated with HCC risk. More rigorous association studies are needed to verify the involvement ofXRCC1 Arg280His polymorphism in HCC susceptibility.展开更多
Objective To clarify the association between rs1050450 polymorphism in Glutathione peroxidase-1 （GPx-1） and the risk of cardi-ovascular diseases （CVD） by performing a meta-analysis of published studies. There is g...Objective To clarify the association between rs1050450 polymorphism in Glutathione peroxidase-1 （GPx-1） and the risk of cardi-ovascular diseases （CVD） by performing a meta-analysis of published studies. There is growing evidence from different study types for an association of the GPx-1 polymorphism and cardiovascular outcomes, but observational studies have so far shown inconsistent results. Me-thods Relevant publications were searched through PubMed, Embase database databases and the Cochrane Library. We used odds ratios （ORs） with 95%confidence intervals （CIs） to assess the strength of association under the best genetic model. Both Q statistic and the I2 were used to check heterogeneity. Meta-regression analysis was performed to explore heterogeneity source. Sensitivity analysis, cumulative me-ta-analysis analysis and publication bias were used to test the reliability of the results. Results Data were available from two cohort studies and 8 case-control studies involving 1,430 cases and 3,767 controls. The pooled ORs for overall CVD risk was 1.36 with 95%CI：1.08-1.70 under a co-dominant model, and that for East Asian subgroup was 1.84 （95%CI：1.39-2.43）. Substantial heterogeneity for ORs were de-tected among all the included studies, mainly caused by ethnic differences between East Asian and non-East Asian populations. Although Egger＇s regression test suggested no statistical significant publication bias, Begg＇s funnel plot exhibited obvious asymmetry. The statistical significance disappeared after adjusting for potential publication bias in the overall studies. However, no substantial publication bias was found in the East Asian subgroup. Conclusions GPx-1 gene Pro198Leu and Pro197Leu polymorphisms considerably increased the risk of CVD in the East Asian population. Large-scale investigations are needed to confirm the results in different ethnicities.展开更多
Atrial fibrillation (AF) is the most common arrhythmia with multi-factorial pathogenesis. A number of studies of genetic epidemiology have assessed the association of G112A (G38S) single nucleotide polymorphisms (SNPs...Atrial fibrillation (AF) is the most common arrhythmia with multi-factorial pathogenesis. A number of studies of genetic epidemiology have assessed the association of G112A (G38S) single nucleotide polymorphisms (SNPs) in Mink gene with AF in different populations. However, the results are inconsistent and inconclusive. We performed a Meta-analysis of the association between G112A polymorphisms of MinK gene and AF to estimate the magnitude of the gene effect. Six case-control studies with a combined 854 cases and 1079 controls were summarized. Subgroups in different races were separately analyzed. Heterogeneity and publication bias were also explored. When all groups were pooled, the individuals with G allele had an over 40% higher risk of AF compared with individuals with the A allele. The GG genotype (versus AA genotype) was found to be significant association with increased AF risk. The significant associations were also found in both dominant and recessive genetic model. For subgroup analysis, the results were consistent with above, except that the pooled OR for Chinese population was not significant in a recessive genetic model. In conclusion, G112A polymorphisms in Mink gene may have an important effect on the pathogenesis of AF. This warrants further investigation in large multi-center studies with precise design.展开更多
DNA repair gene are important in maintaining genome stability and integrity. Xeroderma pigmentosum group D (XPD) polymorphisms have been reported with prostate cancer (PCa) risk, but the conclusion remained controvers...DNA repair gene are important in maintaining genome stability and integrity. Xeroderma pigmentosum group D (XPD) polymorphisms have been reported with prostate cancer (PCa) risk, but the conclusion remained controversial. The aim of this study was to derive a more precise estimation of the associations of two common XPD polymorphisms with the susceptibility of PCa. The pooled odds ratios (ORs) with their 95% confidence intervals (CIs) were estimated to assess the association between XPD polymorphisms and PCa risk. A total of ten trials including 3,991 cases and 4,814 controls who were evaluated of XPD rs13181 genotype and PCa risk, but no statistical relationship was found both overall four genetic model and subgroup analyses. In addition, seven studies were identified with a total 7,642 participants to assess association between rs1799793 genetic polymorphism and PCa susceptibility. There were a slight association between PCa risk and XPD rs1799793 genetic polymorphism (CC versus TT, OR=0.52, 95% CI 0.25-1.06, P=0.07;Dominant model, OR=0.56, 95% CI 0.30-1.06, P=0.08 and recessive model, OR=0.74, 95% CI 0.53-1.03, P=0.08). Moreover, subgroup analysis stratified by ethnicity found the protective effect of rs1799793 polymorphism against PCa risk upon Asian population (CC versus TT, OR=0.48, 95% CI 0.32-0.72, P=0.00;Dominant model, OR=0.52, 95% CI 0.28-0.95, P=0.03 and recessive model, OR=0.67, 95% CI 0.50-0.89, P=0.01). Taken together, the existing evidence indicates XPD rs1799793 polymorphism should be viewed as a protective effect against PCa risk under CC versus TT, Dominant and Recessive model. For rs13181 polymorphism, no associations were found between this variant and the susceptibility of PCa.展开更多
文摘运用Meta分析的方法综合评价低密度脂蛋白受体相关蛋白基因（low density lipoprotein receptor-related protein 1 gene，LRP-1）第三外显子C766T多态性与阿尔茨海默氏病（Alzheimer’s disease，AD）发病风险的关系。通过检索Medline、Cochrane图书馆和中国生物医学文献数据库（OBM），纳入内容涉及LRP-1基因C766T多态性的基因型频率和（或）等位基因频率的独立病例对照研究。各文献满足研究方法相似，有综合的统计指标。研究年限为1997-2004年。语种不限。应用RevMan4.2软件进行统计分析。在AD组3764例和对照组3647例研究对象中，分别对基因型和等位基因频率做合并统计。各研究之间有显著的异质性，P〈0．01，故采用随机效应模型分析合并结果。总体效应检验未发现CC基因型频率在病例对照之间统计学上的差异（Z=1．74，P=0．08，OR=1．17，95％CI：0．98-1．39），C等位基因频率在病例对照之间也未发现差异（Z=1．31，P=0．19，OR=1．11，95％CI．0．95—1．31）。Meta分析结果提示，LRP-1基因C766T多态性不是AD的主要风险因子，但尚不能完全排除其可能在AD发病中具有微弱的作用。
基金supported by the National Natural Science Foundation of China(No.81071914)
文摘Objective MicroRNA plays a vital role in gene expression, and microRNA dysregulation is involved in carcinogenesis. The miR- 196a-2 polymorphism rs11614913 is reportedly associated with cancer susceptibility. This meta-analysis was performed to assess the overall association of miR-196a-2 with cancer risk. Methods A total of 27 independent case-control studies involving 10,435 cases and 12,075 controls were analyzed for the rs11614913 polymorphism. Results A significant association was found between rs11614913 polymorphism and cancer risk in four genetic models （CT vs. TT, OR-1.15, 95%CI=1.05-1.27; CC vs. TT, OR=1.23, 95%CI=1.08-1.39; Dominant model, OR=1.17, 95%CI=1.06-1.30; Additive model, OR-1.08, 95%CI=1.01-1.14）. In the subgroup analysis of different tumor types, the C allele was associated with increased risk of lung, breast, and colorectat cancer, but not with liver, gastric, or esophageal cancer. In the subgroup analysis by ethnicity, a significantly increased risk of cancer was found among Asians in all genetic models, but no associations were found in the Caucasian subgroup. Conclusions The meta-analysis demonstrated that the miR-196a-2 polymorphism is associated with cancer susceptibility, especially lung cancer, colorectal cancer, and breast cancer among Asian populations.
基金Supported by International Science and Technology Cooperation Program of the Ministry of Science and Technology,No.010S2012ZR0058the National Basic Research Program of China,No. 2012CB526706+2 种基金the Innovation Program of Shanghai Municipal Education Commission,No.13ZZ060the Fund of Shanghai Municipal Health Bureau,No. 2008Y077the Special Program for Military Medicine,No. 2010JS15
文摘AIM： To perform a systematic meta-analysis to in- vestigate the association between X-ray repair crosscomplementing group 1 （XRCC1） polymorphisms and hepatocellular carcinoma （HCC） risk. METHODS： Relevant studies extracted from PubMed, Embase, Wanfang, VIP and the Chinese National Knowledge Infrastructure databases up to March 2012 were included in the study. Stata software, version 11.0, was used for the statistical analysis. The odds ratios （ORs） and 95% confidence interval （CI） of the XRCC1 polymorphisms in HCC patients were analyzed and compared with healthy controls. The meta-analysis was performed using fixed-effect or random-effect methods, depending on the absence or presence of significant heterogeneity. RESULTS： Eleven studies with 2075 HCC cases and 2604 controls met our eligibility criteria （four studies, 888 cases and 938 controls for Arg194Trp, four studies, 858 cases and 880 controls for Arg280His, and nine studies, 1845 cases and 2401 controls for Arg399Gln）. The meta-analysis revealed no associations between the Arg194Trp and Arg399GIn polymorphisms of the XRCC1 gene and HCC risk under all contrast models （codominant, dominant and recessive models） in the overall analysis and sensitivity analysis （the studies with controls not in the Hardy-Weinberg equilibrium were excluded）. For XRCC1 Arg280His polymorphism, the overall analysis revealed the significant associa- tion between the His/His genotype and the increased risk of HCC （His/His vs Arg/Arg model, OR： 1.96, 95% CI： 1.03-3.75, P = 0.04）. However, sensitivity analysis showed an altered pattern of result and non-significant association （OR： 2.06, 95% CI： 0.67-6.25, P = 0.20）. The heterogeneity hypothesis test did not reveal any heterogeneity, and Begg＇s and Egger＇s tests did not find any obvious publication bias. CONCLUSION： The XRCC1 Arg194Trp and Arg399GIn polymorphisms are not associated with HCC risk. More rigorous association studies are needed to verify the involvement ofXRCC1 Arg280His polymorphism in HCC susceptibility.
文摘Objective To clarify the association between rs1050450 polymorphism in Glutathione peroxidase-1 （GPx-1） and the risk of cardi-ovascular diseases （CVD） by performing a meta-analysis of published studies. There is growing evidence from different study types for an association of the GPx-1 polymorphism and cardiovascular outcomes, but observational studies have so far shown inconsistent results. Me-thods Relevant publications were searched through PubMed, Embase database databases and the Cochrane Library. We used odds ratios （ORs） with 95%confidence intervals （CIs） to assess the strength of association under the best genetic model. Both Q statistic and the I2 were used to check heterogeneity. Meta-regression analysis was performed to explore heterogeneity source. Sensitivity analysis, cumulative me-ta-analysis analysis and publication bias were used to test the reliability of the results. Results Data were available from two cohort studies and 8 case-control studies involving 1,430 cases and 3,767 controls. The pooled ORs for overall CVD risk was 1.36 with 95%CI：1.08-1.70 under a co-dominant model, and that for East Asian subgroup was 1.84 （95%CI：1.39-2.43）. Substantial heterogeneity for ORs were de-tected among all the included studies, mainly caused by ethnic differences between East Asian and non-East Asian populations. Although Egger＇s regression test suggested no statistical significant publication bias, Begg＇s funnel plot exhibited obvious asymmetry. The statistical significance disappeared after adjusting for potential publication bias in the overall studies. However, no substantial publication bias was found in the East Asian subgroup. Conclusions GPx-1 gene Pro198Leu and Pro197Leu polymorphisms considerably increased the risk of CVD in the East Asian population. Large-scale investigations are needed to confirm the results in different ethnicities.
基金Supported by the National Natural Science Foundation of China (30630056)the Natural Science Foundation of Chongqing (2006BB5064)
文摘Atrial fibrillation (AF) is the most common arrhythmia with multi-factorial pathogenesis. A number of studies of genetic epidemiology have assessed the association of G112A (G38S) single nucleotide polymorphisms (SNPs) in Mink gene with AF in different populations. However, the results are inconsistent and inconclusive. We performed a Meta-analysis of the association between G112A polymorphisms of MinK gene and AF to estimate the magnitude of the gene effect. Six case-control studies with a combined 854 cases and 1079 controls were summarized. Subgroups in different races were separately analyzed. Heterogeneity and publication bias were also explored. When all groups were pooled, the individuals with G allele had an over 40% higher risk of AF compared with individuals with the A allele. The GG genotype (versus AA genotype) was found to be significant association with increased AF risk. The significant associations were also found in both dominant and recessive genetic model. For subgroup analysis, the results were consistent with above, except that the pooled OR for Chinese population was not significant in a recessive genetic model. In conclusion, G112A polymorphisms in Mink gene may have an important effect on the pathogenesis of AF. This warrants further investigation in large multi-center studies with precise design.
文摘DNA repair gene are important in maintaining genome stability and integrity. Xeroderma pigmentosum group D (XPD) polymorphisms have been reported with prostate cancer (PCa) risk, but the conclusion remained controversial. The aim of this study was to derive a more precise estimation of the associations of two common XPD polymorphisms with the susceptibility of PCa. The pooled odds ratios (ORs) with their 95% confidence intervals (CIs) were estimated to assess the association between XPD polymorphisms and PCa risk. A total of ten trials including 3,991 cases and 4,814 controls who were evaluated of XPD rs13181 genotype and PCa risk, but no statistical relationship was found both overall four genetic model and subgroup analyses. In addition, seven studies were identified with a total 7,642 participants to assess association between rs1799793 genetic polymorphism and PCa susceptibility. There were a slight association between PCa risk and XPD rs1799793 genetic polymorphism (CC versus TT, OR=0.52, 95% CI 0.25-1.06, P=0.07;Dominant model, OR=0.56, 95% CI 0.30-1.06, P=0.08 and recessive model, OR=0.74, 95% CI 0.53-1.03, P=0.08). Moreover, subgroup analysis stratified by ethnicity found the protective effect of rs1799793 polymorphism against PCa risk upon Asian population (CC versus TT, OR=0.48, 95% CI 0.32-0.72, P=0.00;Dominant model, OR=0.52, 95% CI 0.28-0.95, P=0.03 and recessive model, OR=0.67, 95% CI 0.50-0.89, P=0.01). Taken together, the existing evidence indicates XPD rs1799793 polymorphism should be viewed as a protective effect against PCa risk under CC versus TT, Dominant and Recessive model. For rs13181 polymorphism, no associations were found between this variant and the susceptibility of PCa.
