Immunohistochemically, the tumor cells were positive for vimentin and smooth muscle actin (SMA clone 1A4, HHF35) and negative for desmin, S100 protein, calretinin, BLC2, CD117, DOG-1, CD34, CKAE1/AE3, HMB45, MELAN-A, MNF116, and anaplastic lymphoma kinase (analysis FISH with probe ALK Break Apart Vysis, gene ALK 2p23). This evidence concerns the gene ALK and neoplasm.