AstrocytomaBrain NeoplasmsGlioblastomaGliomaOligodendrogliomaSupratentorial NeoplasmsNimustineDacarbazineOptic Nerve NeoplasmsAntineoplastic Agents, AlkylatingBrain Stem NeoplasmsGliosarcomaHypothalamic NeoplasmsLomustineKarnofsky Performance StatusChromosomes, Human, Pair 10Neoplasm Recurrence, LocalCarmustineProcarbazineCombined Modality TherapyMagnetic Resonance ImagingSurvival AnalysisSpinal Cord NeoplasmsDisease ProgressionImmunohistochemistryPrognosisTumor Markers, BiologicalSurvival RateTomography, X-Ray ComputedAstrocytesTreatment OutcomeAntineoplastic AgentsCerebellar NeoplasmsCentral Nervous System NeoplasmsDrug Administration ScheduleRetrospective StudiesAnaplasiaEpendymomaTumor Cells, CulturedAntineoplastic Combined Chemotherapy Protocols