AstrocytomaBrain NeoplasmsGlioblastomaGliomaOligodendrogliomaSupratentorial NeoplasmsNimustinePrognosisDacarbazineOptic Nerve NeoplasmsAntineoplastic Agents, AlkylatingBrain Stem NeoplasmsGliosarcomaKarnofsky Performance StatusNeoplasm Recurrence, LocalLomustineHypothalamic NeoplasmsChromosomes, Human, Pair 10CarmustineSurvival AnalysisProcarbazineCombined Modality TherapyMagnetic Resonance ImagingTumor Markers, BiologicalDisease ProgressionImmunohistochemistrySurvival RateSpinal Cord NeoplasmsTreatment OutcomeRetrospective StudiesTomography, X-Ray ComputedAntineoplastic AgentsAntineoplastic Combined Chemotherapy ProtocolsAstrocytesEpendymomaCerebellar NeoplasmsTumor Cells, CulturedAnaplasiaDrug Administration ScheduleCentral Nervous System NeoplasmsNeoplasm GradingGlial Fibrillary Acidic Protein