GliomaBrain NeoplasmsGlioblastomaAstrocytomaOptic Nerve GliomaCell Line, TumorBrain Stem NeoplasmsDisease Models, AnimalTumor Cells, CulturedDacarbazineImmunohistochemistryApoptosisAntineoplastic Agents, AlkylatingSignal TransductionBrainRNA, MessengerGene Expression Regulation, NeoplasticNeoplasm GradingMutationReverse Transcriptase Polymerase Chain ReactionSupratentorial NeoplasmsMice, NudeCell ProliferationBlotting, WesternCells, CulturedNeoplasm TransplantationNeoplasm InvasivenessMice, Inbred C57BLVirulenceMolecular Sequence DataGliosarcomaIsocitrate DehydrogenaseCell LineAstrocytesGene Expression ProfilingMagnetic Resonance ImagingCase-Control StudiesDisease ProgressionCentral Nervous System NeoplasmsNimustineFlow CytometryMeningiomaTime FactorsUp-RegulationMice, TransgenicNeoplastic Stem CellsCell SurvivalXenograft Model Antitumor AssaysCytokinesNeovascularization, PathologicBase SequenceGene ExpressionMice, KnockoutPrognosisTransfectionAntineoplastic AgentsRNA, Small InterferingPolymerase Chain ReactionGenetic Predisposition to Disease