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Chronic Lymphocytic Leukemia
Each year, nearly 9,730 people in the United States learn that they have chronic lymphocytic leukemia. The disease may be referred to as chronic lymphoid leukemia or as CLL. CLL results from an acquired injury to the DNA of a single cell, a lymphocyte, in the bone marrow. This injury is not present at birth. Scientists do not yet understand what produces this change in the DNA of CLL patients.

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Chronic lymphocytic leukemia (CLL) is a cancer of the white blood cells and bone marrow. The bone marrow is the spongy inner part of bones where blood cells are produced. White blood cells arise from the marrow and circulate in the blood. Chronic lymphocytic leukemia is characterized by uncontrolled growth of blood cells.


Chronic lymphocytic leukemia (CLL)

Chronic lymphocytic leukemia is a malignancy (cancer) of the white blood cells (lymphocytes) characterized by a slow, progressive increase of these cells in the blood and the bone marrow.



What is CLL?

Chronic Lymphocytic Leukemia (CLL) is a condition characterized by an accumulation of abnormal lymphocytes in the blood and the bone marrow.


Chronic Lymphocytic Leukemia

CLL is a disorder of morphologically mature but immunologically less mature lymphocytes and is manifested by progressive accumulation of these cells in the blood, bone marrow, and lymphatic tissues. In this disorder, lymphocyte counts in the blood are usually equal to or higher than 5,000/mm3 with a characteristic immunophenotype (CD5 and CD23 positive B cells).



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