MMP9 and chronic kidney disease: Univariate analysis indicated that IFS was positively associated with serum creatinine (r = 0.461, p = 0.001), presence of CKD (r = 0.356, p = 0.015), and MMP-9 intensity in ATn (r = 0.333; p = 0.024), and negatively associated with eGFR (r = −0.544, p<0.001), and MMP-9 expression in ATc (r = −0.410, p = 0.005) and NTc (r = −0.455, p = 0.001).