- Patients must have newly diagnosed stage I-IV, persistent or recurrent (including unstaged) uterine carcinosarcoma (malignant mixed mullerian tumor-MMMT or with ovarian, fallopian tube or peritoneal carcinosarcoma and an enrollment date prior to 10/21/2013; pathology confirmed by site/institutional pathologist prior to enrollment) and be chemotherapy na?ve as directed against their carcinosarcoma; unstaged patients (patients who have not had hysterectomy or ovarian surgery) are eligible and should be included as unstaged if the only histologic (pathology) documentation of the disease is a biopsy or curettage of the uterus; if these patients have documented metastatic disease, it should be assigned the appropriate stage (III/IV)