TERT: Oligodendrogliomas have loss of one copy of the entire short arm of chromosome 1 (1p) along with one copy of the long arm of chromosome 19 (19q) by definition and may harbor TERT activating promoter mutations (Miller et al., 2017; Koelsche et al., 2013; Lee et al., 2018) which are early and clonal events in gliomagenesis (Suzuki et al., 2015; Exner et al., 2019). This evidence concerns the gene TERT and oligodendroglioma.