Representative immunochemical markers in tumor specimens. (A, B) Positive reaction for IDH1 (100×, 200×, respectively). (C) Positive reaction for Ki-67, with proliferating index >80% (200×). (D, E) Tumor cells were positive for GFAP and Oligo-2, respectively (200×). (F, G, H) showed the tumor cells were negative for EMA, MGMT, and vimentin, respectively (200×).