Based on WHO 2016 classification, the histopathological diagnoses were as follows: 22 cases of diffuse astrocytoma, IDH-mutant (grade II); 7 cases of anaplastic astrocytoma, IDH-mutant (grade III); and 2 cases of glioblastoma, IDH-mutant (grade IV). Here, IDH1 is linked to diffuse astrocytoma.