POLE and neoplasm: Hierarchical clustering of ECs by SNV and SCNA proportions revealed that 12 of 13 POLEmut–p53abn ECs clustered with single‐classifier POLE‐mutant ECs, while a single case clustered with the single‐classifier p53abn tumours (p ≤ 0.001, chi‐squared test) (Figure 3).