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Lymphoma - A type of blood cancer that begins in immune system cells. Lymphoma occurs when lymphocytes (a type of disease-fighting white blood cell) begin behaving abnormally. Although there are several sub-types of lymphoma, the two main types are Hodgkin’s disease (or Hodgkin's lymphoma) and non-Hodgkin’s lymphoma (NHL). Hodgkin's lymphoma is marked by the presence of an abnormal cell called the Reed-Sternberg cell. Lymphoma is the most common form of blood cancer overall and the third most common cancer among children.
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