phase III Randomized study between retroperitoneal lymphadenectomy with and without caudal external iliac lymph nodes on lymphedema of the lower extremities after surgeries of endometrial cancer (a randomized study by multi-institutes)

INTERVENTION: peritoneal lymphadenectomy with caudal external iliac lymph nodes peritoneal lymphadenectomy without caudal external iliac lymph nodes CONDITION: Endometrial cancer PRIMARY OUTCOME: To compare the cumulative incidences of lymphedema after retroperitoneal lymphadenectomy between with and without caudal external iliac lymph nodes among three years after the surgeries. SECONDARY OUTCOME: To compare the cumulative incidences of lymphedema after retroperitoneal lymphadenectomy between with and without caudal external iliac lymph nodes among three years after the surgeries. INCLUSION CRITERIA: 1) Patients who were diagnosed endometrial cancer by histopathological examination. 2) Patients who will be performed retroperitoneal lymph node dissection. 3) Performance status 0 or 1 1) Patients who were Informed and concented.