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Leukemia (sometimes spelled leukaemia) is a cancer of the body’s blood-forming tissues, including the bone marrow and the lymphatic system. It usually involves the white blood cells, which are potent infection fighters. In people with leukemia, the bone marrow produces an excessive amount of abnormal white blood cells, which don’t function properly.
There are many types of leukemia, some forms are more common in children while others occur mostly in adults. The exact cause of leukemia is unknown, but it seems to develop from a combination of genetic and environmental factors.