Immunohistochemistry revealed that the tumor cells were positive for CD31 (Fig. 2B), ETS-Related gene (ERG) (Fig. 2C), Friend leukemia integration-1 (Fli-1) (Fig. 2D), and cytokeratin (CK) (Fig. 2E), the Ki-67 proliferation index was 40% (Fig. 2F), and CD34, glial fibrillary acidic protein (GFAP), epithelial membrane antigen (EMA), and S-100 were all absent. This evidence concerns the gene GFAP and neoplasm.