AstrocytomaBrain NeoplasmsGlioblastomaGliomaOligodendrogliomaSupratentorial NeoplasmsNeoplasm GradingDacarbazineImmunohistochemistryPrognosisCell Line, TumorCentral Nervous System NeoplasmsGene Expression Regulation, NeoplasticTumor Markers, BiologicalSpinal Cord NeoplasmsAntineoplastic Agents, AlkylatingEpendymomaHypothalamic NeoplasmsNeoplasm InvasivenessKi-67 AntigenNimustineBrain Stem NeoplasmsMeningiomaImmunoenzyme TechniquesTumor Cells, CulturedNeoplasm Recurrence, LocalDisease ProgressionDNA Modification MethylasesIsocitrate DehydrogenaseSurvival Analysis