Kostas Stamatopoulos, MD, PhD from the Institute of Applied Biosciences, Center for Research and Technology Hellas, Thessaloniki, Greece talks about how new technologies have revealed heterogenity of tumour cells within and between patients. He hopes that the future of CLL will use this new information to move towards precision medicine. This interview was recorded at the International Workshop on Chronic Lymphocytic Leukemia (iwCLL) 2017 in New York, NY.