Receptor, Platelet-Derived Growth Factor betaMyofibromatosisReceptor, Platelet-Derived Growth Factor alphaMyeloproliferative DisordersDermatofibrosarcomaChordomaOncogene Proteins, FusionEosinophiliaChromosomes, Human, Pair 5BenzamidesMastocytosis, SystemicPiperazinesPyrimidinesIn Situ Hybridization, FluorescenceCytogeneticsProto-Oncogene Proteins c-sisTranslocation, GeneticProto-Oncogene Proteins c-kitReverse Transcriptase Polymerase Chain ReactionGene Expression Regulation, NeoplasticSignal TransductionAntineoplastic AgentsRNA, MessengerMutation