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Leukemia is a malignancy (cancer) of blood cells. In leukemia, abnormal blood cells are produced in the bone marrow. Usually, leukemia involves the production of abnormal white blood cells the cells responsible for fighting infection.
However, the abnormal cells in leukemia do not function in the same way as normal white blood cells.
The leukemia cells continue to grow and divide , eventually crowding out the normal blood cells. The end result is that it becomes difficult for the body to fight infections, control bleeding, and transport oxygen.