OUTLINE: This is a dose escalation, multicenter study. Patients receive SCH-58500 via stereotactic injection into the tumor, followed 24-72 hours later by craniotomy. Patients undergo tumor resection, followed by injection of SCH-58500 into the tumor bed during craniotomy. Cohorts of 3-6 patients receive escalating doses of SCH-58500 until the maximum tolerated dose (MTD) is determined. The MTD is defined as the dose immediately preceding that at which 3 of 3-6 patients experience dose limiting toxicity. Patients are followed at day 28, then every 2 months for 1 year, and then annually thereafter, until another therapy is begun or disease progression is documented.