Of the mutated CPGs, 37% were involved in DNA damage response, including ATM, BRCA2, PMS2, POLE. ATM GVs (n = 6) preferentially predisposed to IDH-mutant astrocytoma (P = 0.007) in patients that were significantly younger at diagnosis than patients without GVs (P = 0.022). The gene discussed is POLE; the disease is astrocytoma (excluding glioblastoma).