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Unified Medical Language System® (UMLS®)

2013AB UMLS NCI Thesaurus Source Information

Web site:

The National Cancer Institute (NCI) Thesaurus is produced by NCI Enterprise Vocabulary Services (EVS). EVS is a collaborative effort of the NCI Office of Communications and the NCI Center for Bioinformatics. The EVS provides a set of services and resources, including NCI Thesaurus and NCI Metathesaurus, that facilitate the standardization of terminology across the Institute and the larger biomedical community.

The NCI Thesaurus is a reference terminology and biomedical ontology.

NCI Thesaurus covers vocabulary for cancer-related clinical care, translational and basic research, and public information and administrative activities.

NCI Thesaurus provides definitions, synonyms, and other information on nearly 10,000 cancers and related diseases, 8,000 single agents and combination therapies, and a wide range of other topics related to cancer and biomedical research. It is maintained by a multidisciplinary team of editors, who add about 900 new entries each month.

NCI Thesaurus is used by NCI and the biomedical community.

Update Frequency
NCI Thesaurus is updated monthly.

Metathesaurus Update Frequency
NCI Thesaurus is updated annually in the Metathesaurus.

Sites Consulted

  1. National Cancer Institute [Internet]. Bethesda (MD): National Cancer Institute (US); [updated 2007 Mar 26]. NCI Enterprise Vocabulary Services (EVS); [cited 2008 Sep 29]. Available from: