Cranial IrradiationPrecursor Cell Lymphoblastic Leukemia-LymphomaBrain NeoplasmsCarcinoma, Small CellMethotrexateCombined Modality Therapy6-MercaptopurineInjections, SpinalAsparaginaseRadiation InjuriesRadiotherapyLeukemia, LymphoidWhole-Body IrradiationSmall Cell Lung CarcinomaDose-Response Relationship, RadiationRadiotherapy DosageVincristineLung NeoplasmsCentral Nervous System NeoplasmsRadiation Injuries, ExperimentalAntineoplastic Combined Chemotherapy ProtocolsOrgan Sparing TreatmentsIntelligenceRemission InductionEtoposideMeningeal NeoplasmsCytarabineUltraviolet RaysDose FractionationIntelligence TestsDaunorubicinSurvivorsBrainCognition DisordersCerebellar NeoplasmsGamma RaysPrednisoneCyclophosphamideSurvival AnalysisLearning DisordersFood IrradiationMedulloblastomaCisplatinAntimetabolites, AntineoplasticFollow-Up StudiesDisease-Free SurvivalTreatment OutcomeTime FactorsSurvival RateRadiotherapy, AdjuvantLeukemiaDrug Administration ScheduleRetrospective StudiesNeuropsychological TestsRecurrenceBody HeightBone Marrow TransplantationRadiation-Protective AgentsRadiation DosageLymphatic IrradiationPrognosisX-RaysRadiation EffectsCognitionAge FactorsDoxorubicinAntineoplastic AgentsLeukocyte CountHippocampusRadiation ToleranceRegression AnalysisNeoplasm StagingRisk FactorsHeavy IonsMice, Inbred C57BLDexamethasoneCobalt RadioisotopesRiskTomography, X-Ray ComputedProspective StudiesRadiationMicrowavesSex Factors