Immunotherapy Research with Steven Rosenberg, M.D., Ph.D. Immunotherapy Research with Steven Rosenberg, M.D., Ph.D. Why is immunotherapy such a hot area of cancer research today? In this short excerpt from the documentary, “Cancer: The Emperor of All Maladies, PBS”, Dr. Steven A. Rosenberg of the National Cancer Institute’s Center for Cancer Research discusses his work in immunotherapy and its promise for cancer patients.