OUTLINE: This is an open label, multicenter study. Patients receive denileukin diftitox IV over 30-60 minutes on days 1-5. Patients also receive oral dexamethasone twice daily beginning 24 hours prior to and concomitantly with denileukin diftitox. Treatment continues every 3 weeks for at least 6 courses in the absence of disease progression or unacceptable toxicity. Patients are followed at 2 or 4 weeks.