SMN1 and inflammatory myofibroblastic tumor: 4 Immunohistochemically, both of them expressed endothelial cell markers CD31 and CD34 and myofibroblast marker SMA, but about 30% of HEHE expressed ERG, FLI-1, FVII-rag, CK (AE1/AE3) or EMA, and Caldesmon and ALK was more common in IMT (> 50%) (11).