Immunohistochemistry revealed that the tumour cells were positive for vimentin and SMA expression (Figure 4), focal expression of calponin and CD10, and weak expression of β-catenin, with no expression of CD117, DOG-1, desmin, caldesmon, HMB45, ALK, CD34, S-100, CK, or SOX10. This evidence concerns the gene KIT and neoplasm.