 - MDX-010 Ipilimumab will be administered, as per the assigned dose level, as a 90-minute intravenous infusion on the same day as the monthly boosting vaccinations with PROSTVAC-FTRICOM fowlpox. After 6 courses of MDX-010, patients may receive Maintenance dose of MDX-010 every 3 months until there is evidence of disease progression or toxicity, for up to an additional 12 months equivalent to 4 additional MDX-010 courses. 