MedulloblastomaCerebellar NeoplasmsPrognosisNeuroectodermal Tumors, PrimitiveBrain NeoplasmsHedgehog ProteinsSurvival AnalysisTumor Markers, BiologicalSurvival RateCranial IrradiationInfratentorial NeoplasmsDisease-Free SurvivalNeoplasm StagingImmunohistochemistryRetrospective StudiesKaplan-Meier EstimateCerebellumMultivariate AnalysisPredictive Value of TestsGene Expression Regulation, NeoplasticAnaplasiaFollow-Up StudiesTreatment OutcomeCombined Modality TherapyCell Line, TumorNeoplasm Recurrence, LocalProportional Hazards ModelsEpendymomaBasal Cell Nevus SyndromeGene Expression ProfilingVeratrum AlkaloidsCranial Fossa, PosteriorCell ProliferationChromosomes, Human, Pair 17Lymphatic MetastasisTime FactorsAntineoplastic Combined Chemotherapy ProtocolsBreast NeoplasmsAntineoplastic AgentsNeoplasm InvasivenessProspective StudiesReverse Transcriptase Polymerase Chain ReactionNeoplasm MetastasisVincristineRisk FactorsAstrocytomaTissue Array AnalysisKi-67 AntigenDisease ProgressionSignal TransductionRadiotherapy DosageNeoplasm ProteinsTumor Suppressor Protein p53Proto-Oncogene Proteins c-mycOligonucleotide Array Sequence AnalysisMice, NudeCohort StudiesChemotherapy, AdjuvantPinealomaReceptors, Cell SurfaceImmunoenzyme Techniques