AstrocytomaGlioblastomaBrain NeoplasmsOligodendrogliomaGliomaSupratentorial NeoplasmsNimustineChromosomes, Human, Pair 10Loss of HeterozygosityPrognosisImmunohistochemistryHypothalamic NeoplasmsSpinal Cord NeoplasmsDacarbazineCentral Nervous System NeoplasmsOptic Nerve NeoplasmsEpendymomaBrain Stem NeoplasmsCell Line, TumorAntineoplastic Agents, AlkylatingAstrocytesTumor Cells, CulturedCerebellar NeoplasmsMeningiomaNeoplasm GradingGene Expression Regulation, NeoplasticGlial Fibrillary Acidic ProteinMeningeal NeoplasmsMagnetic Resonance ImagingNervous System NeoplasmsIsocitrate DehydrogenaseTumor Markers, Biological