At present there are no satisfactory therapies for these patients with recurrent GBM and the practitioner is left with best effort combination therapy for this disease. At present a number of chemotherapeutic agents, including nitrosoureas, carboplatin, bevacizumab, etoposide, irinotecan, and imatinib, have been used as salvage therapy either alone or in combination. Additional trials with a variety of agents are underway, but preliminary results from single-agent studies have been disappointing. Currently, only nitrosoureas (lomustine and carmustine), including Gliadel® Wafer (carmustine) as adjunct to surgery, are approved for use in previously treated GBM. At present the treatment of recurrent disease with any available agent results in median survival in the ranges of 22-44 weeks. The historical data from previous human exposure with Neuradiab is highly suggestive of a benefit to patient survival.