Immunohistochemical examination showed the tumor cells were S-100 protein (+), glial fibrillary acidic protein (+), Olig2 (+), mIDH1-R132H (-), p53 (+, less than 10 %), and ATRX (+), with MIB-1 labeling index of 2 % (Fig. 3). Here, TP53 is linked to neoplasm.