RhabdomyosarcomaRhabdomyosarcoma, EmbryonalRhabdomyosarcoma, AlveolarMuscle NeoplasmsMesenchymomaDesminMyogeninPaired Box Transcription FactorsNeoplasms, Connective TissueMyoD ProteinNeoplasms, Connective and Soft TissueSoft Tissue NeoplasmsSarcoma, EwingPAX7 Transcription FactorPulmonary BlastomaSarcomaLeiomyosarcomaImmunohistochemistryForkhead Transcription FactorsMyogenic Regulatory FactorsOncogene Proteins, FusionTumor Markers, BiologicalImmunoenzyme TechniquesMuscle, SkeletalNeuroblastomaNeoplasm TransplantationTransplantation, HeterologousGene Expression Regulation, NeoplasticDNA-Binding ProteinsCell Line, TumorCell DifferentiationMusclesTranscription FactorsNeoplasmsAntibodies, MonoclonalTumor Cells, CulturedPolymerase Chain ReactionPrognosisMutationTranscription, Genetic