To see if megestrol acetate plus Levonorgestrel-releasing intrauterine system (LNG-IUS) will not be inferior to returning the endometrial tissue to a normal state than megestrol acetate alone in patients with early endometrial cancer.
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Inclusion Criteria: * Primarily have a confirmed diagnosis of endometrioid endometrial cancer based upon hysteroscopy * MRI parameters shows there's no myometrial invasion, extension beyond corpus, or enlarged lymph nodes * Have a desire for remaining reproductive function or uterus * Need to be able to undergo correlative treatment and follow-up Exclusion Criteria: * Acute liver disease or liver tumor (benign or malignant) or renal dysfunction * Pregnancy or suspicion of pregnancy * Have a history of EAH or EC and have disease relapse during Merina insertion * Under treatment of high-dose progestin therapy more than 3 months in recent 6 months * Congenital or acquired uterine anomaly including fibroids if they distort the uterine cavity * Confirmed diagnosis of malignant tumor in genital system * Acute severe disease such as stroke or heart infarction or a history of thrombosis disease * Hypersensitivity or contradiction to any component of this product * Ask for removal of the uterus or other conservative treatment * Smoker(\>15 cigarettes a day)