From The Cancer Genome Atlas (TCGA) glioma cohort, we selected tumors that have both RNA-Seq bam files and annotation of IDH mutation and 1p/19q codeletion available, resulting in 638 samples [496 low grade glioma (LGG) and 142 glioblastoma multiforme (GBM)]. The gene discussed is IDH1; the disease is central nervous system cancer.