stromal sarcoma survivalmetastatic endometrial stromal sarcomaendometrial stromal sarcoma pathologyendometrial stromal sarcoma cancerendometrial stromal cell sarcomaendometrial sarcomaendometrial stromalsarcoma uterine cancerendometrial carcinoma sarcomastromal sarcoma uterusundifferentiated endometrial sarcomametastatic endometrial sarcoma