Chronic lymphocytic leukemia, or CLL, is a cancer involving lymphocytes, a type of white blood cell.
Chronic lymphocytic leukemia, shortened to CLL, is a blood cancer involving lymphocytes. Lymphocytes are white blood cells that form part of the immune system. In CLL, these cells become cancerous. The diagnosis contains more information than a blood-cell count alone.
No. A raised lymphocyte count can have different causes and does not by itself establish CLL. Clinicians use further assessment to determine why the count is high and whether a blood cancer is present. The term alone also does not predict an individual course.

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