- Arm I: Patients receive dacarbazine IV over 1 hour and cisplatin IV over 3 hours on days 1-3. Patients also receive interferon alfa subcutaneously (SQ) on days 1-5 and interleukin-2 by continuous IV infusion on days 4-9. Treatment continues every 28 days for a maximum of 4 courses in the absence of disease progression or unacceptable toxicity.