- Course 1: Patients receive sodium stibogluconate IV over 15 minutes on day 1 and days 15-18; interferon alfa-2b subcutaneously (SC) on days 8-12 and 15-18; cisplatin IV over 30-60 minutes and vinblastine IV on days 19 and 20; and dacarbazine. After a 2-week rest period, patients proceed to course 2.