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Lymphoma is a form of cancer that attacks lymphatic tissue and especially affects lymphocytes, a type of white blood cell. It is the seventh most common form of cancer across the world and accounts for about 3% to 4% of all cases in the United States. Though it can occur at any age, lymphoma is the most common cancer affecting teens and young adults.

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1. Two Common Types

While four different forms of lymphoma are identified by the World Health Organization, two are most commonly recognized: Hodgkin's and non-Hodgkin's. Hodgkin's lymphoma is distinguished by the Reed-Sternberg cell, a distinctive type of cell that increases in number as Hodgkin's lymphoma progresses. It is more treatable than non-Hodgkin's lymphoma, which refers to all other types of lymphoma. Non-Hodgkin's lymphoma generally affects elderly individuals.

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