If you choose to keep the levonorgestrel IUD after Month 12, you will remain on study for as long as the levonorgestrel IUD is still in place. Instead of visiting the study doctor, you will visit your primary gynecologic oncologist after that. Anytime you have check-ups or biopsies of the lining of your uterus as part of your routine medical care, as long as the levonorgestrel IUD is still in place, the results of the check-ups or biopsies will be shared with the study staff and will be used as part of this research study. You will remain "on study" for as long as the levonorgestrel IUD is still in place. You may ask your primary gynecologic oncologist to remove the IUD at any time.