Despite intensive treatment efforts combining surgery, radio- and chemotherapy, the prognosis of patients suffering from glioblastoma (GBM) remains poor. Virtually all GBMs progress despite therapy. Patients receiving the standard therapy at primary disease have a median overall survival of 12-15 months. There is currently no defined standard treatment regimen for recurrent GBM. Tyrosine kinase receptor-targeted therapy is widely used in preclinical and clinical experimental brain tumor research. Increased tyrosine kinase activity has been asssociated with GBM oncogenesis and several tyrosine kinase receptors, e.g. VEGFR, FGFR, PDGFR are upregulated in malignant glioma. In the past and in the present, targeting of VEGF- and PDGF-signaling (amongst others) has shown promising preclinical and clinical results in human glioblasto-ma.