Supplementary Material for: Meta-Analysis of <b><i>MMP9</i></b> –1562C/T and the Risk of Coronary Heart Disease

<b><i>Introduction:</i></b> Previous case-control studies have suggested that the –1562C/T and R279Q polymorphisms of the matrix metalloproteinase 9 gene <i>(MMP9) </i>are associated with coronary heart disease (CHD). However, other studies do not confirm these relationships. The objective is to assess these relationships using meta-analysis. <b><i>Methods:</i></b> Databases, including PubMed and ScienceDirect, were searched to access the genetic association studies. Then data were extracted. Pooled odds ratio (OR) and 95% confidence interval (CI) were calculated. Moreover, subgroup and sensitive analysis were performed. <b><i>Results:</i></b> The meta-analysis of the –1562C/T polymorphism included 12 studies with 8,336 cases and 3,984 controls. The –1562T allele was significantly associated with CHD (OR 1.25, 95% CI 1.08–1.45, p = 0.004). There was heterogeneity among the 12 studies (I<sup>2</sup> = 61%, p = 0.003). The overall results were consistent and were not changed substantially by the removal of any data set. The meta-analysis of the R279Q polymorphism, including 6 studies with 6,983 cases and 3,282 controls, showed that the R279Q polymorphism was not associated with CHD (p = 0.16). <b><i>Conclusions:</i></b> The synthesis of available evidence supports the fact that the <i>MMP9</i> –1562C/T polymorphism is a risk factor for CHD.