The tumor cells were also negative for pan-cytokeratin (CK, 1:400; Novocastra, Newcastle, UK), S100 protein (1:2,000; Dako), CD117 (1:200; Dako), CD31 (1:80; Dako), CD34 (1:400; Dako) and h-caldesmon (1:100; Dako). This evidence concerns the gene KIT and neoplasm.