P2RY12 and glioma: Of the 21 underexpressed genes, 13 (AKR1C3, CDHR1, DLL1, DLL3, DPP10, ETNPPL, GDF10, IRX2, LUZP2, P2RY12, SCG3, TNR and VIPR2) are reportedly associated with gliomas (Table 4).