Lack of MMP-9 expression is a marker for poor prognosis in Dukes' B colorectal cancer

Abstract

Background: Matrix metalloproteinases (MMPs) play a role in cancer progression by degrading extracellular matrix and basement membranes, assisting in tumour neovascularization and in supporting immune response in cancer. Methods. We studied the prognostic value of immunohistochemical expression of MMP-2, MMP-8, and MMP-9 in a series of 619 colorectal cancer patients using tissue microarray specimens. Results: Of the samples, 56% were positive for MMP-2, 78% for MMP-8, and 60% for MMP-9. MMP-9 associated with low WHO grade (p < 0.001). In univariate analysis of Dukes' B tumours, MMP-9 negativity associated with poor survival (p = 0.018), and MMP-9 positivity was an independent prognostic marker in multivariate analysis of these tumours (p = 0.034). Conclusion: Negative MMP-9 expression can predict poor prognosis in Dukes' B colorectal tumours and may prove useful for identifying patients, who should be offered adjuvant treatment. © 2012 Koskensalo et al.; licensee BioMed Central Ltd.