4. Patients having undergone recent resection of recurrent or progressive tumor will be eligible as long as all the following conditions are met: a) Patients have recovered from the effects of surgery; b) Extent of residual disease (if present) has been documented by MRI performed no later than 72 hours after surgery or, if not possible, at least 4 weeks post-operative. Radiographic evidence of residual disease is not mandated for enrollment.