Several well-established endothelial cell markers, such as CD31 (platelet endothelial cell adhesion molecular 1), CD34 (human hematopoietic progenitor cell antigen), and factor VIII-related antigen, are used to confirm epithelioid hemangioendothelioma [13]. The gene discussed is PECAM1; the disease is epithelioid hemangioendothelioma.