However, MMP2 expression level has no prognostic value for GBM (median survival of 0.8 year), while having favorable prognostic values for grade III anaplastic astracytoma (median survival of 3 years), anaplastic oligodendroglioma (median survival 7 years), and grade II oligodendroglioma (median survival 9-10 years) [20]. This evidence concerns the gene MMP2 and oligodendroglioma.