•Uterine serous carcinoma (USC) is an aggressive subtype of endometrial cancer.•Mutations in DNA polymerase ε gene (POLE) are detected in a subset of USC and confer a strong mutator phenotype.•USC patients diagnosed with POLE mutations experience a significantly better prognosis.
Keywords: Endometrial cancer; Polymerase epsilon somatic mutations; Uterine serous carcinoma.