Peter Hillmen, MD, PhD, from the University of Leeds, Leeds, UK, talks to us about the need to determine the durability of chronic lymphocytic leukemia (CLL) patients’ responses off-treatment. He notes that there is difficulty in doing so due to individual patients having differing response rates. This video was recorded at the International Workshop on Chronic Lymphocytic Leukemia (iwCLL) 2017 in New York, NY.