Specifically, four samples (GLIO 1, GLIO 7, GLIO 23, GLIO 227) initially classified as glioblastomas based on histopathology were reclassified as “Astrocytoma, IDH-mutant, WHO grade 2 or 3” according to molecular analysis (Table 2). Here, IDH1 is linked to astrocytoma (excluding glioblastoma).