Patients receive 3-AP (Triapine®) IV over 2 hours on days 1-4 and 15-18. Treatment repeats every 28 days for up to 6 courses (for stable patients) in the absence of disease progression or unacceptable toxicity. Patients who achieve a complete response (CR) receive 1 additional course after documentation of CR. Patients who achieve a partial response (PR) receive 2 additional courses after documentation of stable PR.