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NCIt content comes from NCI, NIH, agencies and standards development organizations such as FDA and CDISC, other partners, user requests, and ongoing review of the scientific literature (see EVS Use and Collaborations). This content is organized in a richly structured description logic environment, with numerous relationships between concepts to help define and connect them. Individual concepts include codes, terms, abbreviations, synonyms, definitions, links to outside sources, and a wide variety of other useful information.

More complete description of the semantics of NCIt is available. A document briefly describing the editorial policies governing change to NCIt content is included with the semantics information.

The NCI Thesaurus is updated monthly.  Complete change history for each concept is provided through EVS APIs and browsers. 

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