ERG and gastrointestinal stromal tumor: Ets-related gene (ERG), Desmin, S100, low-molecular-weight cytokeratin (CAM5.2), pan-cytokeratin (AE1/AE3), cytokeratin 7, cytokeratin 19, CD117, chromogranin A, discovered on GIST (DOG-1), melanosome (HMB-45), CD56, alpha-fetoprotein (AFP), and hepatocyte paraffin 1 (HepPar-1) were completely negative.