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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 more than 400900,000 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.
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NCIt is registered in the HL7 OID Registry
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NCIt provides cross-links and semantics for a broader range of EVS terminology 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 70 100 biomedical terminologies. EVS cross-links NCIt and NCIm to a wide variety of other terminologies and ontologies that are published separately, such as CTCAE, GO, ICD-910-CM, LOINC, MedDRA, SNOMED CT, and the VA's NDFMED-RT.
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