MMP9 and chronic kidney disease: A large number of serum and urinary molecules such as NGAL, KIM-1, MCP-1, MMP-9, interleukin-18, clusterin, MMP-9, TIMP-1, Procollagen I alpha 1, FGF-23, suPAR, as well as PTX-2 are under investigation to predict CKD progression (8,9).