Immunotherapy is now the hottest topic in cancer research and could revolutionise the way the disease is treated in the future. Our internationally renowned panel discuss the vast potential of the immune system. Quezada is Professor of Immune Regulation and Tumour Immunotherapy at UCL. Kristeleit is Clinical Senior Lecturer and Consultant Medical Oncologist at UCLH. Elliott is Professor of Experimental Medicine at the University of Southampton. In conversation with Sarah Knapton.