OligodendrogliomaDacarbazineBrain NeoplasmsAntineoplastic Agents, AlkylatingChromosomes, Human, Pair 19Chromosomes, Human, Pair 1LomustineAntineoplastic Combined Chemotherapy ProtocolsAstrocytomaGliomaGlioblastomaSupratentorial NeoplasmsProcarbazineChemotherapy, AdjuvantCombined Modality TherapyGangliogliomaO(6)-Methylguanine-DNA MethyltransferaseTreatment OutcomeSpinal Cord NeoplasmsDisease-Free SurvivalOncogene Proteins v-erbBPrognosisAntineoplastic AgentsNeoplasm Recurrence, LocalSurvival AnalysisDNA Modification MethylasesEpendymomaIsocitrate DehydrogenaseLoss of HeterozygosityVincristineCerebral Ventricle NeoplasmsMagnetic Resonance ImagingSurvival RateCisplatinIn Situ Hybridization, FluorescenceFatal OutcomeChromosomes, Human, Pair 10Drug Administration ScheduleChromosome DeletionNeoplasm GradingCell Line, TumorCarmustineDrug Resistance, NeoplasmCyclophosphamideDoxorubicinImmunohistochemistryDNA Repair Enzymes