In 2013, the Cancer Genome Atlas (TCGA) defined four genomic subgroups: Polymerase epsilon (POLE)-mutant tumours (ultrahypermutated), MSI (hypermutated), copy-number low (endometrioid) and copy-number high tumours (serous-like) through integration of multi-omics data13. The gene discussed is POLE; the disease is neoplasm.