AstrocytomaBrain NeoplasmsGlioblastomaGliomaOligodendrogliomaHypothalamic NeoplasmsSupratentorial NeoplasmsNeoplasm GradingSpinal Cord NeoplasmsOptic Nerve NeoplasmsEpendymomaImmunohistochemistryBrain Stem NeoplasmsCentral Nervous System NeoplasmsPrognosisMeningiomaCerebellar NeoplasmsTumor Markers, BiologicalNimustine