Richard Rosenquist, MD, PhD, from Karolinska University Hospital, Solna, Sweden, and John Seymour, MBBS, PhD, Peter MacCallum Cancer Center, Victoria, Australia, speaking at the 18th International Workshop on Chronic Lymphocytic Leukemia (iwCLL) Biennial Meeting, held in Edinburgh, UK. Dr Rosenquist and Dr Seymour discuss biological predictors, such as p53 mutations, and their implications on chronic lymphocytic leukemia (CLL) treatment.