uterine leiomyosarcoma prognosisuterine sarcoma survivaluterine sarcoma survival rateepithelioid sarcoma prognosisuterine cancer prognosisserous uterine cancer prognosisewing sarcoma prognosisstage 3 uterine cancer prognosisspindle cell sarcoma prognosissarcoma mesotheliomaepithelioid sarcomacarcinoma sarcoma of the uterus