IDH1 and neoplasm: In a retrospective cohort study of 486 patients, IDHwt tumours were significantly more likely to undergo MT than IDH mutated and 1p/19q co-deleted (IDHmut/codel tumours) (P < .001), with the 5-year estimates of MT delay of 82% for IDHwt and 92% for IDHmut/codel tumours.