Thalidomide and Irinotecan in Treating Patients With Glioblastoma Multiforme Who Have Undergone Radiation Therapy

RATIONALE: Thalidomide may stop the growth of glioblastoma multiforme by stopping blood flow to the tumor. Drugs used in chemotherapy use different ways to stop tumor cells from dividing so they stop growing or die. Combining thalidomide with irinotecan may kill any tumor cells remaining after radiation therapy. PURPOSE: Phase II trial to study the effectiveness of combining thalidomide with irinotecan in treating patients who have glioblastoma multiforme that has been treated with radiation therapy.