- Arm II (systemic therapy): Patients receive dacarbazine IV over 30-60 minutes and/or cisplatin IV over 30 minutes on days 1, 2, 3, 22, 23, and 24 (1 course). Courses repeat every 42 days in the absence of disease progression or unacceptable toxicity. Patients achieving a complete response (CR) receive at least 1 additional course of chemotherapy beyond CR and are eligible for other investigational strategies.