International Harmonization of Rat Nomenclature

Recommended RAT nomenclature
The international harmonized nomenclature which is shown in the recommendation column is the result of discussions among the Rat Nomenclature Reconciliation Subcommittee, a presentation during the 1999 Annual STP Meeting in Washington, D.C., and comments which have been sent to the committee up to December 1999. The drafts were based on the STP, WHO/IARC/RITA and NACAD nomenclature systems and were present for discussion in the Internet since Spring 1999.

  • The biological behavior of each lesion is clearly defined in the name of the lesion. In the nomenclature tables, this is indicated by printing one of the following abbreviations in parenthesis at the end of each lesion name:

      N = non-preneoplastic proliferative lesion
      H = hyperplastic lesion
      B = benign tumor
      M = malignant tumor
      S = malignant systemic tumor

  • Language: US English is used.

  • Modifiers are used to subdivide lesions into different cell types or growth patterns. They are printed in italics and placed after the lesion name in brackets (multiple modifiers are separated by semicolons). The use of all modifiers is facultative.

As described in more detail on the page "Ordering of words in diagnostic terms / synonyms" several possibilities exist how to arrange words of diagnostic terms. The following two links provide a list of all terms used in the Recommendation column:

See also
WHO/IARC/RITA nomenclature
NACAD nomenclature
STP nomenclature

Last Update: 21-Jun-2000