Several kinds of monoclonal antibody were used to evaluate tumor cells immunohistochemically and included anti-Vimentin, CD31, CD34, cytokeratin (CK AE1/AE3, 34 β-E 12, 5/6, and CAM 5.2), desmin, α-smooth muscle actin (α-SMA), myoglobin, myogenin, and Ki-67 (MIB-1) antibodies. The gene discussed is PECAM1; the disease is neoplasm.