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Additional Information
NCI Thesaurus (NCIt) (download) is NCI'= s reference terminology and ontology. NCIt provides responsive, science-bas= ed terminology concepts used in NCI semantic infrastructure and information= systems. It covers terminology for clinical care, translational and basic = research, and public information and administrative activities. NCIt is als= o a widely recognized standard for biomedical coding and reference, used by= a broad variety of public and private partners both nationally and interna= tionally.
NCIt content comes from NCI, NIH, agencies and standards development org= anizations such as FDA and CDISC, other partners, user requests, and ongoin= g review of the scientific literature (see EVS Use and Co= llaborations). This content is organized in a richly structured = description logic environment, with more than 900,000 relationships between= concepts to help define and connect them. Individual concepts include code= s, terms, abbreviations, synonyms, definitions, links to outside sources, a= nd 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 informatio= n.
The NCI Thesaurus is updated monthly, averaging roughly 700 new concepts= and many additional changes with each release. Complete change histo= ry for each concept is provided through EVS APIs and browsers.
NCIt is registered in the HL7 OID Registry as 2.16.840.= 1.113883.3.26.1.1 .
NCIt provides cross-links and semantics for a broader range of EVS termi= nology resources. NCIt is the lead reference for the NCI Metathesaurus (NCIm), which = provides rich synonymy and mappings among the codes and terms used in more = than 100 biomedical terminologies. EVS cross-links NCIt and NCIm to a= wide variety of other terminologies and ontologies that are published sepa= rately, such as CTCAE, GO, ICD-10-CM, LOINC, MedDRA, SNOMED CT, and the VA'= s MED-RT.