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Lymphoma: Cancer that begins in cells of the immune system. There are two basic categories of lymphomas. Hodgkin lymphoma, which is marked by the presence of a type of cell called the Reed-Sternberg cell. Non-Hodgkin lymphomas, which includes a large, diverse group of cancers of immune system cells. Non-Hodgkin lymphomas can be further divided into cancers that have an indolent (slow-growing) course and those that have an aggressive (fast-growing) course. These subtypes behave and respond to treatment differently. Both Hodgkin and non-Hodgkin lymphomas can occur in children and adults, and prognosis and treatment depend on the stage and the type of cancer.

Abstractor Notes
For more information about lymphoma, including specific lymphoma subtype, see the Hematopoietic and Lymphoid Neoplasm Database, see http://seer.cancer.gov/seertools/hemelymph/