Neoplasm Regression, SpontaneousRemission, SpontaneousRemission InductionThoracic NeoplasmsRhabdomyomaHemangioendotheliomaNeuroblastomaLentiviruses, Ovine-CaprineKeratoacanthomaBlisterGanglioneuromaTomography, X-Ray ComputedSkin NeoplasmsHistiocytosis, Langerhans-CellLung NeoplasmsFollow-Up StudiesLiver NeoplasmsPrognosisalpha-FetoproteinsRegression AnalysisPleural NeoplasmsBiopsyTime FactorsCarcinoma, HepatocellularTreatment OutcomeRecurrenceMagnetic Resonance ImagingAntineoplastic Combined Chemotherapy ProtocolsInfant, NewbornImmunohistochemistryCombined Modality TherapyRetrospective StudiesEarly Detection of CancerCytarabineSurvival AnalysisProspective StudiesLeukemia, Myeloid, AcuteCyclophosphamideSurvival RateDisease-Free SurvivalAntineoplastic Agents