Chronic lymphocytic leukemia (CLL) is a type of cancer that starts from cells that become certain  white blood cells (called lymphocytes) in the bone marrow. The cancer (leukemia) cells start in the bone marrow but then go into the blood.

In CLL, the leukemia cells often build up slowly over time, and many people don't have any symptoms for at least a few years. In time, the cells can spread to other parts of the body, including the lymph nodes, liver, and spleen
(source : National Cancer Institute)


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