Of note, given the mutual exclusivity of TP53 alteration and 1p/19q codeletion in IDH-mutant lower-grade glioma [24], none of the IDH1R132X oligodendrogliomas harbored CIC and/or FUBP1 mutations that are associated with 1p/19q codeletion. This evidence concerns the gene IDH1 and oligodendroglioma.