The previous diagnosis of “IDH‐mutant GBM” should be corrected to “IDH‐mutant astrocytoma, WHO grade 4” in the presence of at least one of the following features: microvascular proliferation, necrosis, and homogeneous deletion of the CDKN2A/B gene [10]. Here, IDH1 is linked to astrocytoma (excluding glioblastoma).