After the Wu et al. was removed from the current meta-analysis, the association between MMP-9-1562C>T gene polymorphism and CAD was further strengthened under the allelic genetic model (OR: 1.72, 95% CI: 1.35–2.19, P = 1.3 × 10−5, Pheterogeneity = 0.04, I2 = 50.0%; Wu et al., 2009). Here, MMP9 is linked to coronary artery disorder.