Incident and death cases ascertainment Patients with uterine cancer, including uterine carcinoma, uterine sarcoma … etc., will be identified from computerized linkage to the Taiwan national cancer registry with International Classification of Diseases for Oncology Third Edition T-code C540-C543. Histological types will be identified from morphology code in the cancer registry database. Women affected by uterine cancer and found death due to uterine cancer (International Classification of Diseases 9th edition code 182) in deaths certificate will be defined as death cases.