Through multicenter, prospective, randomized, controlled clinical studies comparing different treatment options (fertility-sparing surgery and ovarian preservation surgery and radical surgery)therapeutic efficacy, safety and quality of life of patients, exploration of the best strategies and risks for the treatment of early endometrial cancer, and promotion and application.

Patients eligible for enrollment are selected and divided into three groups randomly, including fertility group,ovarian preservation group and endometrial cancer radical surgery group. Take interventions including fertility preservation surgery,ovarian preservation surgery and endometrial cancer radical surgery for patients in different groups respectively. Compare therapeutic efficacy, safety and quality of life of patients to evaluate three treatment and explore the best treatment for clinical application.

Inclusion Criteria:

1. Premenopausal women, age ≤ 50 years
2. Surgical curettage / hysteroscopic pathology confirmed, endometrioid adenocarcinoma G1/G2 (including well-differentiated, high-medium and middle-differentiation);
3. Clinical consideration of IA (<1/2 muscle infiltration);
4. First-time treatment
5. The subject (or his legal representative) must understand the nature of the study and sign an informed consent form.

Exclusion Criteria:

1. At the same time participate in other clinical trials;
2. Can not tolerate surgery;
3. Ovarian suspicious metastasis;
4. Have a family history of ovarian cancer;
5. Incorporate other malignant tumors;
6. Preoperative CA125 abnormal persons