The proportion of patients who had received a resection was slightly higher for WHO grade II tumors than for grade III tumors in IDH-mut astrocytoma (91/86%) and notably higher in IDH1-R132H-nm tumors (71/53%), while it was lower in IDH-mut oligodendroglioma (74/94%). Here, IDH1 is linked to astrocytoma (excluding glioblastoma).