IDH1 and glioblastoma: In addition, low ATRX expression was positively correlated with tumor type (recurrent) (P < 0.0046), 1p/19q non-codeletion (P < 0.0001), IDH status (mutant) (P < 0.0001), and subgroups of glioma with LGG and GBM (Figures 3G–J).