The TERT promoter mutation (chr5:1,295,113:C>T, C228T), found in the majority of oligodendrogliomas, was also detected in all four tumors (VAF Case 1: 0.60 and 0.64, Case 2: 0.33 and 0.38 for primary and relapsed samples, respectively). The gene discussed is TERT; the disease is oligodendroglioma.