uterine leiomyosarcoma prognosisuterine sarcoma survivaluterine sarcoma survival rateliposarcoma picturesmyxoid liposarcoma picturesewing sarcoma picturesepithelioid sarcoma prognosisuterine cancer prognosisserous uterine cancer prognosisewing sarcoma prognosisstage 3 uterine cancer prognosisspindle cell sarcoma prognosis