Aims: The present study was undertaken to determine the association between −1562C>T polymorphism in the promoter region of matrix metalloproteinase-9 (MMP-9) and coronary artery disease (CAD) risk. Methods: This meta-analysis was on the basis of 26 studies that included 12,776 cases and 6371 controls, heterogeneity of which was assessed by the Q-statistic test and the I2-statistic test. Sensitivity analysis was conducted by sequentially omitting any single study and recalculating the odds ratios (ORs) and 95% confidence intervals (CIs). Funnel plots and Egger's test were performed to test the potential publication bias. All data were analyzed by using STATA version 12.0. Results: We found that −1562C>T polymorphism did not contribute to the risk of CAD in the overall results. But the stratified analysis by ethnicity indicated that −1562C>T polymorphism might decrease susceptibility to CAD in Asians (OR, 0.94; 95% CI, 0.88-1.00; ph=0.956 for CC vs. CT+TT). Conclusions: Our meta-analysis supports the fact that −1562C>T polymorphism may have association with CAD risk in Asian populations. But further larger studies are required to confirm our findings.
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