Immunohistochemistry (IHC) revealed that the tumor cells were positive for SMA, CD34, Vim, β-catenin, Fli-1, WT-1, CD117, Bcl-2, CyclinD1, CD31, CD99, INI-1 and Ki-67 (80%), and lacked EMA, CK, Myogenin, Desmin, CD68, and S-100 (Fig. 4). The gene discussed is PECAM1; the disease is neoplasm.