IDH1 and neoplasm: Immunohistochemical staining was performed and demonstrated that the tumor cells expressed P53 (Figure 2C), CD99 (Figure 2D), GFAP (glial fibrillary acidic protein, Figure 2E), synaptophysin (Syn, Figure 2F), Olig-2 (Figure 2G), and IDH1 (Figure 2H).