KRT19 and endometrial cancer: It was tested in order to determine its usefulness in the early diagnosis of endometrial cancer alongside such markers as SCC (squamous cell carcinoma antigen), CYFRA 21-1 (Cytokeratin 19 fragments), CA 125 (cancer antigen-125), CA 19-9 (cancer antigen-19-9), or IAP (immunosuppressive acidic protein).