Nivolumab Alone or in Combination With Ipilimumab in Treating Patients With Advanced Uterine Leiomyosarcoma

This phase II trial studies how well nivolumab alone or in combination with ipilimumab works in treating patients with uterine cancer that has spread to other places in the body and usually cannot be cured or controlled with treatment. Monoclonal antibodies, such as nivolumab and ipilimumab, may interfere with the ability of tumor cells to grow and spread.