Liposarcoma, MyxoidLiposarcomaDioxolesTetrahydroisoquinolinesRNA-Binding Protein FUSSoft Tissue NeoplasmsTranscription Factor CHOPAntineoplastic Agents, AlkylatingLipomaMuscle NeoplasmsChromosomes, Human, Pair 12Chromosomes, Human, Pair 16SarcomaRNA-Binding Protein EWSOncogene Proteins, FusionRetroperitoneal NeoplasmsNeoplasms, Adipose TissueTranslocation, GeneticExtremitiesCompassionate Use TrialsPhotiniaCCAAT-Enhancer-Binding ProteinsNeoplasms, Connective and Soft TissueLeiomyosarcomaChondrosarcoma