The Kaplan–Meier analysis of cohorts stratified by the 1p/19q co-deletion status and around the median of the PER expression levels showed that the association of PER expression with overall survival was statistically significant for tumors with intact 1p/19q (p = 0.01) (astrocytic lineage) (Figure 2C,D) but did not achieve statistical significance in the 1p/19q co-deleted (codel) cohort (molecularly defined as oligodendroglioma). The gene discussed is PER1; the disease is oligodendroglioma.