Kaplan–Meier survival analysis considering ProMisE subgroups and L1CAM expression. OS and DSS of ProMisE subgroups before (a, b) and after (c and d) stratifying for L1CAM status within the p53 wt/NSMP subgroup. a Five-year OS rates of 87.3% for POLE tumours, 85.2% for p53 wt/NSMP tumours, 75.0% for MMR-D tumours, and 39.6% for p53 abn tumours (p < 0.001). b Five-year DSS rates of 97.6% for POLE tumours, 93.6% for p53 wt/NSMP tumours, 84.7% for MMR-D tumours, and 54.8% for p53 abn tumours (p < 0.001) c Five-year OS rates of 87.3% for POLE tumours, 88.2% for p53 wt/NSMP, L1CAM negative tumours, 75.0% for MMR-D tumours, 51.5% for p53 wt/NSMP, L1CAM-positive tumours and 39.6% for p53 abn tumours (p < 0.001) d Five-year DSS rates of 97.6% for POLE tumours, 95.5% for p53 wt/NSMP, L1CAM negative tumours, 84.7% for MMR-D tumours, 65.5% for p53 wt/NSMP, L1CAM-positive tumours and 54.8% for p53 abn tumours for disease-specific 5-year survival (p < 0.001)