INDUCTION THERAPY: Patients receive high-dose recombinant interferon alfa-2B intravenously (IV) over 20 minutes on days 1-5. Treatment repeats weekly for 4 weeks in the absence of disease progression or unacceptable toxicity. Or patients receive ipilimumab IV over 90 minutes on day 1. Treatment repeats every 3 weeks for a total of 4 courses in the absence of disease progression or unacceptable toxicity.