Chronic lymphocytic leukemia (CLL) is the most common leukemia in adults. It’s a type of cancer in which the bone marrow makes too many lymphocytes (a type of white blood cell). Many patients do not have any symptoms for at least a few years. But over time, the cells grow in number and spread to other parts of the body, including the lymph nodes, liver, and spleen. Blood tests can be done for early detection. With advances in treatment, a chemo-free approach to CLL is now a reality.