Cranial IrradiationCarcinoma, Small CellSmall Cell Lung CarcinomaBrain NeoplasmsLung NeoplasmsOrgan Sparing TreatmentsCombined Modality TherapyEtoposideRadiation InjuriesRecurrenceDose FractionationRadiotherapy DosageVincristineAntineoplastic Combined Chemotherapy ProtocolsRemission InductionCisplatinPrecursor Cell Lymphoblastic Leukemia-LymphomaSurvival AnalysisNeoplasm Recurrence, LocalDisease-Free SurvivalSurvival RateTreatment OutcomeMethotrexateNeoplasm Staging6-MercaptopurineInjections, SpinalAsparaginaseRadiotherapyLeukemia, LymphoidWhole-Body IrradiationDose-Response Relationship, RadiationCentral Nervous System NeoplasmsRadiation Injuries, ExperimentalIntelligenceFollow-Up StudiesMeningeal NeoplasmsCytarabineRetrospective StudiesUltraviolet RaysTime FactorsSurvivorsDaunorubicinIntelligence TestsPrognosisBrainCyclophosphamidePrednisoneCerebellar NeoplasmsCognition DisordersRadiotherapy, AdjuvantGamma RaysRisk FactorsDrug Administration ScheduleProspective StudiesMedulloblastomaAntibiotic ProphylaxisLearning DisordersAntimetabolites, AntineoplasticFood IrradiationLeukemiaAge FactorsTomography, X-Ray ComputedAntineoplastic Agents