MMP2 and myeloid sarcoma: Contradictory results have been reported in previous studies where MMP-2 levels in acute and chronic demyelinated lesions [23–25] as well as in CSF [26] in serum [15, 17, 20] and in peripheral blood mononuclear cells (PBMCs) [27–29] were increased, decreased, or represented in equivalent amounts in MS patients and in controls.