MMP9 (Matrix Metallopeptidase 9) is a member of metalloproteinases (MMPs) that plays an important role not only in tumor invasion and migration (Herszenyi et al., 2007; Herszenyi et al., 2008), but also in inflammation and remodeling in UC (Stallmach et al., 2000; von Lampe et al., 2000). Here, MMP9 is linked to neoplasm.