Time to locoregional recurrence per molecular class in PORTEC-1. (A) Time to locoregional recurrence in POLE-mutated endometrial cancer. (B) Time to locoregional recurrence in mismatch-repair deficient endometrial cancer. (C) Time to locoregional recurrence in p53 abnormal endometrial cancer. (D) Time to locoregional recurrence in no specific molecular profile endometrial cancer. EBRT, external beam radiotherapy; EC, endometrial cancer; MMRd EC, EC with mismatch repair deficiency (POLE wild-type); NAT, no adjuvant therapy; NSMP EC, EC with no specific molecular profile (POLE wild-type, MMR-proficient, and p53 wild-type); POLEmut EC, EC with a pathogenic mutation of DNA polymerase-ε; p53abn EC, EC with a p53 abnormality (POLE wild-type and MMR-proficient).