AstrocytomaGlioblastomaBrain NeoplasmsNimustineGliomaSupratentorial NeoplasmsNitrosourea CompoundsOligodendrogliomaIsocitrate DehydrogenaseChromosomes, Human, Pair 10Central Nervous System NeoplasmsMeningiomaNervous System NeoplasmsEpendymomaImmunohistochemistryBrain Stem NeoplasmsHypothalamic NeoplasmsSpinal Cord NeoplasmsLoss of HeterozygosityMeningeal NeoplasmsChromosomes, Human, Pair 19Gene Expression Regulation, NeoplasticNeoplasm GradingTumor Markers, BiologicalPTEN PhosphohydrolasePrognosisReceptor, Epidermal Growth FactorChromosomes, Human, Pair 1DacarbazineKi-67 AntigenDNA Modification MethylasesCell Line, TumorGene AmplificationGenes, p53Astrocytes