What are the classification schemas for non-Hodgkin lymphoma (NHL) and cutaneous T-cell lymphoma (CTCL)?

Updated: Aug 15, 2018
  • Author: Lauren C Pinter-Brown, MD; Chief Editor: Emmanuel C Besa, MD  more...
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Answer

The three most commonly used classification schemas for non-Hodgkin lymphoma (NHL) are as follows:

  • National Cancer Institute’s Working Formulation (IWF) [120]

  • Revised European-American Classification of Lymphoid Neoplasms (REAL) [121]

  • World Health Organization (WHO) classification [122]

The Working Formulation, originally proposed in 1982, classified and grouped lymphomas by morphology and clinical behavior (ie, low, intermediate, or high grade) with 10 subgroups labeled A to J. [120] In 1994, the Revised European-American Lymphoma (REAL) classification attempted to apply immunophenotypic and genetic features in identifying distinct clinicopathologic NHL entities. [121]

The World Health Organization (WHO) classification, first introduced in 2001 and updated in 2008, further elaborates upon the REAL approach. This classification divides NHL into two groups: those of B-cell origin and those of T-cell/natural killer (NK)–cell origin. [122]

Although considered obsolete, the National Cancer Institute’s Working Formulation (IWF) classification is still used mainly for historical data comparisons. [120]


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