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Non-Hodgkin's lymphoma, or NHL, is a cancer of the immune system. NHL occurs in lymphocytes, a type of white blood cell. These cells are an important part of your immune system and help defend your body from infection.
When you have NHL, too many white blood cells that are affected by the disease build up in your lymph nodes, blood and bone marrow. They may also build up in your spleen (an organ in your immune system) and cause swelling of this organ.
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