advanced metastatic disease of solid tumors, dictates that each tumor mass, indeed each individual metastasis, will have a unique antigen and cytokine environment and hence unique response to immune modu lation. A differential response to immunotherapy is thus inevitable. 4. Many of the human trials described are not randomized and report survival or response against historical controls. Most tumors described are immunogenic human tumors: renal cell cancer and melanoma are most common. In order to avoid the well-described inter-patient vari ation and rare incidence of spontaneous response...