AstrocytomaHypothalamic NeoplasmsOptic Nerve NeoplasmsGliomaBrain NeoplasmsThalamic DiseasesCerebellar NeoplasmsAntineoplastic ProtocolsOptic ChiasmHypothalamus, AnteriorSupratentorial NeoplasmsNeurofibromatosis 1CraniopharyngiomaProto-Oncogene Proteins B-rafGlioblastomaMagnetic Resonance ImagingOligodendrogliomaComparative Genomic HybridizationBrain Stem NeoplasmsEpendymomaInfratentorial NeoplasmsCentral Nervous System NeoplasmsGenes, Neurofibromatosis 1Spinal Cord NeoplasmsAnaplasiaNeurofibromin 1Cranial Nerve NeoplasmsGangliogliomaImmunohistochemistryNimustineMeningiomaNeoplasm GradingAstrocytesTumor Markers, BiologicalGene Expression Regulation, NeoplasticTumor Cells, CulturedGlial Fibrillary Acidic ProteinMeningeal NeoplasmsImmunoenzyme TechniquesBrainNervous System NeoplasmsDacarbazineCell Line, TumorDNA, NeoplasmIsocitrate Dehydrogenase