MMP7 and gastric cancer: Our meta-analysis indicated the significant poor prognostic effect of MMP7 in GC patients with insignificant heterogeneity (pooled HR = 2.01, 95% CI = 1.62–2.50, Z = 6.32, P < 0.001, Fixed effect; Q = 10.948 on 8 degrees of freedom, P = 0.205, estimate of between studies variance = 0.043).