Gastrointestinal Stromal TumorsBenzamidesPiperazinesPyrimidinesProto-Oncogene Proteins c-kitGastrointestinal NeoplasmsReceptor, Platelet-Derived Growth Factor alphaAntineoplastic AgentsStromal CellsLeukemia, Myelogenous, Chronic, BCR-ABL PositiveProtein Kinase InhibitorsMesenchymomaPyrrolesImmunohistochemistryNeoplasms, Connective TissueEpithelioid CellsDuodenal NeoplasmsMitotic IndexLeiomyosarcomaFusion Proteins, bcr-ablMutationTumor Markers, BiologicalDrug Resistance, NeoplasmTreatment OutcomeIleal NeoplasmsJejunal NeoplasmsIndolesNeoplasms, Multiple PrimaryTomography, X-Ray ComputedIntestinal NeoplasmsProtein-Tyrosine KinasesPrognosisSex Cord-Gonadal Stromal TumorsStomach NeoplasmsDNA Mutational AnalysisDigestive System Surgical ProceduresDisease-Free SurvivalBrain NeoplasmsAntigens, CD34Neurofibromatosis 1Cell Line, TumorLeukemia, Myeloid, Chronic-PhaseSarcomaCarney ComplexGastrectomyLeiomyomaWilms TumorRetrospective StudiesInterstitial Cells of CajalExonsEndosonographyLaparotomyDisease ProgressionCell ProliferationSurvival RateTumor BurdenNeoplasm MetastasisSurvival AnalysisNeurilemmoma