OUTLINE: Patients receive cisplatin IV over 1 hour and dacarbazine IV over 30-60 minutes sequentially on day 1, followed by sargramostim (GM-CSF) subcutaneously (SC) on days 2-7, interleukin-2 SC on days 8-14, and interferon alfa SC on days 8, 10, 12, and 14. Treatment repeats every 28 days in the absence of disease progression or unacceptable toxicity.