MMP9 and triple-A syndrome: Bivariate correlation analysis indicated that MMP-9 levels in plasma of patients with AAA were positively correlated with the maximal aortic diameter (r = 0.6251, P < 0.0001; Fig. 7B) and negatively with miR-30c-1-3p expression (r =  −0.3671, P = 0.01981; Fig. 7C).