AstrocytomaHypothalamic NeoplasmsOptic Nerve NeoplasmsPrognosisBrain NeoplasmsCerebellar NeoplasmsThalamic DiseasesOptic ChiasmGliomaInfratentorial NeoplasmsGlioblastomaNeurofibromatosis 1Antineoplastic ProtocolsAnaplasiaBrain Stem NeoplasmsOligodendrogliomaHypothalamus, AnteriorGangliogliomaGenes, Neurofibromatosis 1CraniopharyngiomaEpendymomaNeurofibromin 1Cranial Nerve NeoplasmsProto-Oncogene Proteins B-rafCentral Nervous System NeoplasmsMagnetic Resonance ImagingTumor Markers, BiologicalSupratentorial NeoplasmsImmunohistochemistryComparative Genomic HybridizationSpinal Cord NeoplasmsGene Expression Regulation, NeoplasticNeoplasm Recurrence, LocalAstrocytesImmunoenzyme TechniquesTomography, X-Ray ComputedGene DosageDNA, NeoplasmSurvival AnalysisTumor Cells, CulturedSurvival RateReverse Transcriptase Polymerase Chain ReactionGene Expression ProfilingOligonucleotide Array Sequence AnalysisNimustineBrainRetrospective StudiesCell Line, TumorCell Transformation, NeoplasticNeoplasm GradingGlial Fibrillary Acidic ProteinTreatment OutcomeNeoplasm StagingGenes, ModifierFollow-Up Studies