GliomaBrain NeoplasmsNeurogliaAstrocytomaGlioblastomaOptic Nerve GliomaGlial Cell Line-Derived Neurotrophic FactorBrain Stem NeoplasmsCell Line, TumorBrainNeuronsDacarbazineImmunohistochemistryTumor Cells, CulturedNerve Tissue ProteinsGlial Cell Line-Derived Neurotrophic Factor ReceptorsAntineoplastic Agents, AlkylatingSupratentorial NeoplasmsGliosisNeoplasm GradingCell ProliferationMice, NudeGliosarcomaOligodendrogliaNestinNeoplasm TransplantationNeoplasm InvasivenessGene Expression Regulation, NeoplasticApoptosisCells, CulturedBlotting, WesternMicrogliaRNA, MessengerCentral Nervous SystemIsocitrate DehydrogenaseCentral Nervous System NeoplasmsStem CellsNerve Growth FactorsIntermediate Filament ProteinsCell SurvivalBrevicanCell DifferentiationMeningiomaRetinaNimustineMagnetic Resonance ImagingDisease Models, AnimalReverse Transcriptase Polymerase Chain ReactionNeural Stem CellsRats, Sprague-DawleyNeoplastic Stem CellsVimentinRats, Nude