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ACS & ASCO are Stronger Together: Cancer.Net content is now available on cancer.org.

 

 

Chronic Lymphocytic Leukemia (CLL)

Chronic lymphocytic leukemia (CLL) is a type of cancer that starts in white blood cells (called lymphocytes) in the bone marrow. CLL mainly affects older adults and accounts for about one-third of all leukemias.