FPS-ZM1 With or Without Dexamethasone for Controlling Post Operative Cerebral Edema in Patients With Glioblastoma

This phase I trial tests the safety, side effects, best dose and how well FPS-ZM1 works for controlling post operative cerebral edema in patients with glioblastoma. FPS-ZM1 works by blocking the pathway that controls inflammation. Dexamethasone is in a class of medications called corticosteroids. It is used to reduce inflammation and lower the body\'s immune response to help lessen the side effects of chemotherapy drugs. Giving FPS-ZM1 with or without dexamethasone may be safe and/or effective in controlling post operative cerebral edema in patients with glioblastoma.