GliomaBiopsyBiopsy, NeedleBrain NeoplasmsGlioblastomaAstrocytomaOptic Nerve GliomaImage-Guided BiopsyBrain Stem NeoplasmsBiopsy, Large-Core NeedleCell Line, TumorBiopsy, Fine-NeedleDacarbazineNeoplasm GradingTumor Cells, CulturedImmunohistochemistrySentinel Lymph Node BiopsyAntineoplastic Agents, AlkylatingSupratentorial NeoplasmsNeoplasm InvasivenessMice, NudeSensitivity and SpecificityMagnetic Resonance ImagingGene Expression Regulation, NeoplasticNeoplasm TransplantationPrognosisRetrospective StudiesGliosarcomaIsocitrate DehydrogenaseCell ProliferationStereotaxic TechniquesApoptosisCentral Nervous System NeoplasmsNimustineTumor Markers, BiologicalRNA, MessengerMeningiomaAntineoplastic AgentsReverse Transcriptase Polymerase Chain ReactionTreatment OutcomeXenograft Model Antitumor AssaysNeoplastic Stem CellsTime FactorsBrainImmunoenzyme Techniques