Ipilimumab may markedly enhance the immunologic responses to tumor antigen released from necrotic tumor cells by radiotherapy by promoting cytotoxic T cell activation, while preventing induction of antigen tolerance. In addition, further beneficial immunologic effects may be achieved by the reduction in the amount of viable tumor cell mass. The net effect may be to promote a significantly enhanced antitumor T cell response. This will result in improved 1-year and 2-year survival, especially if a minimal or microscopic disease state can be achieved within a patient following SART.