 The second sequence is currently open and accruing eligible subjects with high-grade glioma. The trial is an open-label, randomized study and will accrue a total of 54 evaluable patients. Eligible subjects will be randomized to receive either 3 or 6 injections of 131-I labeled TM-601 131-I-TM-601, in weekly intervals at the dose determined in the first sequence of the trial. Patients will undergo debulking surgery and placement of a ventricular access device into the tumor cavity for administration of 131I-TM-601. Patients who participated in the first sequence are not eligible to participate in the second sequence of the study. 