This study will involve 45 patients with malignant glioma brain tumors. Before the study, all patients will be given a physical exam and blood and urine tests, and they will be asked about their cancer and treatment. A magnetic resonance imaging (MRI) scan of the brain will pinpoint the location of the tumor. Female patients who are able to have children will have a pregnancy test. All patients will be asked about their quality of life and will undergo tests of their mental functions. Patients might receive a steroid drug for several days before and after the treatment. This will help prevent swelling around the tumor. Patients will also be given a drug to prevent convulsions.