IDH1 and diffuse astrocytoma: Based on the assessment of IDH mutational status and 1p/19q codeletion, the cases were classified as follows: 33 ODs and 27 AODs IDH-mutant and 1p/19q codeleted; 4 diffuse astrocytomas (DAs) IDH-mutant; 2 GBMs IDH-mutant; and 3 GBMs IDH-wt (Fig. 1 and Supplementary Figure 1).