Ten patients were classified into IDH mutant diffuse astrocytoma, 2 patients with IDH mutant anaplastic astrocytoma, 3 patients with IDH mutant glioblastoma, 9 patients with IDH wild-type diffuse astrocytoma, 10 patients with IDH wild-type anaplastic astrocytoma, and 22 patients with IDH wild-type glioblastoma. The gene discussed is IDH2; the disease is diffuse astrocytoma.