IDH2 and glioblastoma: Both The 2016 WHO classification and WHO CNS5 have declared the mutational status of isocitrate dehydrogenase (IDH) should be considered regarding LGG, which emphasized IDH-wildtype (IDH-WT) as the critical biomarker of high-risk LGG since the molecular characteristics and clinical manifestations of IDH-WT LGG are similar to those of GBM.