Nivolumab and Multi-fraction Stereotactic Radiosurgery With or Without Ipilimumab in Treating Patients With Recurrent Grade II-III Meningioma

This phase I/II trial studies the side effects and best dose of nivolumab when given together with multi-fraction stereotactic radiosurgery and to see how well they work with or without ipilimumab in treating patients with grade II-III meningioma that has come back (recurrent). Immunotherapy with monoclonal antibodies, such as nivolumab and ipilimumab, may help the body's immune system attack the cancer, and may interfere with the ability of tumor cells to grow and spread. Stereotactic radiosurgery is a specialized radiation therapy that delivers a single, high dose of radiation directly to the tumor and may cause less damage to normal tissue. Giving nivolumab and multi-fraction stereotactic radiosurgery with or without ipilimumab may work better in treating patients with grade II-III meningioma.