OUTLINE: Patients receive dacarbazine IV over 2 hours, followed by mitomycin IV over 2-5 minutes, doxorubicin IV over 2-5 minutes, and cisplatin IV over 2 hours on day 1. Patients also receive sargramostim (GM-CSF) subcutaneously (SC) once every 12 hours on days -6 to -3 before the first chemotherapy course and then on days 2-15 and 23-26 of all chemotherapy courses. Courses repeat every 28 days in the absence of disease progression or unacceptable toxicity. Patients achieving stable disease receive a maximum of 4 courses. Patients achieving complete or partial response receive a maximum of 6 courses.