We extracted the expression profiles of nine genes (IDH1, IDH2, MGMT, TERT, EGFR, PTEN, TP53, BRAF, and CDKN2A) from TCGA-GBM Agilent and TCGA-GBM HiSeq cohorts and analyzed their distribution in each subtype. The gene discussed is CDKN2A; the disease is glioblastoma.