(Immunohistochemical stains showed that the tumor cells were positive for desmin and TFE3, while negative for pancytokeratin, CAM5.2, EMA, chromogranin, synaptophysin, NSE, CD45, SMA, HHF35, myogenin, CD117, DOG1, MUC4, S100, SOX10, HMB45, Melan-A, CD31, ERG, TLE1, STAT6, and Cathepsin-K). This evidence concerns the gene STAT6 and neoplasm.