OligodendrogliomaBrain NeoplasmsChromosomes, Human, Pair 19Chromosomes, Human, Pair 1AstrocytomaLomustineGliomaProcarbazineSupratentorial NeoplasmsGangliogliomaDacarbazineSpinal Cord NeoplasmsOncogene Proteins v-erbBIsocitrate DehydrogenaseCerebral Ventricle NeoplasmsAntineoplastic Agents, AlkylatingLoss of HeterozygosityVincristineEpendymomaMagnetic Resonance ImagingIn Situ Hybridization, FluorescenceGlioblastomaChromosomes, Human, Pair 10Chromosome DeletionFatal OutcomeNeoplasm GradingGlial Fibrillary Acidic Protein