Endometrial cancer is the second most common gynecologic cancer in Taiwan. Two types of endometrial cancer may be distinguished by standard clinicopathologic criteria; type I tumors are of low grade, endometrioid histology, estrogen related, and have a good prognosis, whereas type II tumors are high grade, of non-endometrioid histologies, unrelated to estrogen, and have a poor prognosis. Several clinicopathological parameters were reported to correlate with prognosis of endometrial cancer including tumor FIGO stage, cell type, cytological grading, depth of myometrial invasion, tumor size, lymph node status, and etc. However, there is no epidemiologic data of endometrial cancer in Taiwan. So the investigators propose this study to use Taiwan registry database provided by Department of Health to analyze the epidemiology and prognosis of uterine cancer patients in Taiwan.