BRIEF RESEARCH REPORT article Front. Oncol. Sec. Gynecological Oncology Persistent Endometrial Dysfunction After Fertility-Sparing Treatment for Endometrial Carcinoma: Evidence From Donor Oocyte Cycles 1. Casa di Cura Villa Mafalda, Rome, Italy 2. Saint Camillus International University of Health and Medical Sciences, Rome, Italy 3. Policlinico Abano, Abano Terme, Italy 4. Policlinico Universitario Agostino Gemelli Unita Operativa Complessa di Ginecologia Oncologica, Rome, Italy 5.