Non - Hodgkin lymphoma information centre:

The non-Hodgkin lymphomas (NHLs) are a diverse group of blood cancers that include any kind of lymphoma except Hodgkin's lymphomas. Types of NHL vary significantly in their severity, from indolent to very aggressive.

Lymphomas are types of cancer derived from lymphocytes, a type of white blood cell. Lymphomas are treated by combinations of chemotherapy, monoclonal antibodies,immunotherapy, radiation, and hematopoietic stem cell transplantation.

Non-Hodgkin lymphomas were classified according to the 1982 Working Formulation which recognizes 16 types. The Working Formulation is now considered obsolete, and the classification is commonly used primarily for statistical comparisons with previous decades. The Working Formulation has been superseded twice.

The latest lymphoma classification, the 2001 WHO classification, largely abandoned the "Hodgkins" vs. "all other" grouping system. Instead, it lists 43 different forms of lymphomas in four broad groups.