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Definition

By Mayo Clinic staff

Living with cancer newsletter

Subscribe to our Living with cancer newsletter to stay up to date on cancer topics.

Leukemia is cancer of your body's blood-forming tissues, including your bone marrow and lymphatic system. It usually starts in your white blood cells.

Your white blood cells are potent infection fighters — they normally grow and divide in an orderly way, as your body needs them. But in leukemia, your bone marrow produces a large number of abnormal white blood cells, which don't function properly. Leukemia isn't just a children's disease. It has four main types and many subtypes — and only some are common among children.

A diagnosis of leukemia can cause you a great deal of concern, and treatment can be complex — varying on the type of leukemia and other factors. But there are strategies and resources that may make your road easier.

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April 5, 2008

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