IDH2 and glioblastoma: Since in The Cancer Genome Atlas (TCGA) database miRNA data were only available for low grade gliomas (LGG; 448 LGG that include 413 IDH-wt patients and 35 IDH-mut), we examined also the Chinese Glioma Genome Atlas (CGGA) where miRNA data from 86 high grade glioblastoma (GBM) patients are reported (73 IDH-wt patients and 13 IDH-mut).