EGFR and glioblastoma: The literature has reported multiple growth factors or cytokines surface receptors overexpressed in GBM [43,44], including EGFR, PDGFR, VEGFR, transforming growth factor-βR, hepatocyte growth factor/scatter factor receptor, G protein-coupled receptor, interleukin-4, 13, or Urokinase-type plasminogen activator receptor.