The underexpressed GBM genes included the LINC00836 nonprotein-coding gene and 20 protein-coding genes (FERMT1, DLL3, P2RY12, CHST9, IFGN1, CSDC2, ETNPPL, VIPR2, MGAT4C, DLL1, TNR, GDF10, IRX2, SHANK2, ENHO, LUZP2, DPP10, CDHR1, AKR1C3 and SCG3) (Table 2). Here, DLL1 is linked to glioblastoma.