Sarcoma, KaposiLymphomaSarcomaLymphoma, B-CellLymphoma, Non-HodgkinHerpesvirus 8, HumanLymphoma, T-CellLymphoma, Large B-Cell, DiffuseSarcoma, EwingLymphoma, FollicularSarcoma, SynovialBurkitt LymphomaAvian Sarcoma VirusesLymphoma, B-Cell, Marginal ZoneSarcoma, ExperimentalSarcoma 180Lymphoma, AIDS-RelatedLymphoma, Mantle-CellLymphoma, T-Cell, CutaneousSarcoma Viruses, MurineLymphoma, Primary EffusionLymphoma, T-Cell, PeripheralLymphoma, Large-Cell, AnaplasticGiant Lymph Node HyperplasiaHerpesviridae InfectionsSicilySoft Tissue NeoplasmsSarcoma, AvianHistiocytic SarcomaHodgkin DiseaseSarcoma, MyeloidLymphoma, Large-Cell, ImmunoblasticAcquired Immunodeficiency SyndromeSarcoma, Endometrial StromalSkin NeoplasmsSarcoma, Clear CellVincristineDoxorubicinSarcoma, YoshidaKirsten murine sarcoma virusTranslocation, GeneticImmunohistochemistryMoloney murine sarcoma virusViral ProteinsHemangioendotheliomaAntibodies, Monoclonal, Murine-DerivedSarcoma Viruses, FelinePrednisoneBone NeoplasmsCyclophosphamideAntineoplastic Combined Chemotherapy ProtocolsTreatment OutcomeAntigens, CD20Rous sarcoma virusHerpesvirus 4, HumanLymphoma, Extranodal NK-T-CellB-LymphocytesDNA, ViralChromosomes, Human, Pair 18Polymerase Chain ReactionPrognosisAntineoplastic AgentsAntibodies, MonoclonalRetrospective StudiesCell Transformation, NeoplasticChromosomes, Human, Pair 14Cell Transformation, ViralBiopsyCell Line, TumorVirus LatencyLeiomyosarcomaCell LineAntigens, CD30ImmunophenotypingCombined Modality TherapyGene RearrangementBase SequenceTumor Cells, CulturedSarcoma, Alveolar Soft PartRNA-Binding Protein EWSOsteosarcomaAntigens, ViralFatal OutcomeMolecular Sequence DataOncogene Proteins, FusionHIV InfectionsAIDS-Related Opportunistic InfectionsAlpharetrovirusLymph NodesThymus NeoplasmsChilblainsProto-Oncogene Proteins c-bcl-6Proto-Oncogene Protein c-fli-1Eye NeoplasmsHarvey murine sarcoma virusIncidenceGammaretrovirusCentral Nervous System NeoplasmsSurvival AnalysisSurvival Rate