ARG1 and glioblastoma: As a consequence of this activation, microglia release factors such as Matrix metalloproteinases (MMPs), Nitric oxide (NOS), Stress inducible protein-1 (STI-1), Arginase-1 (ARG-1), Interleukins (ILS) and COX2 that can be influence the progression of GBM (35) (Figure 2).