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Chronic lymphocytic leukaemia (CLL) and small lymphocytic lymphoma (SLL) are different forms of the same disease and are treated in the same way. CLL is used to refer to both forms of disease, except where there are important differences. This factsheet descrives what CLL is, who gets it, the causes, symptoms, diagnosis and staging, outlook, treatment, follow-up, relapse, research and targeted treatments, transformation, and living with CLL