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The NCI Thesaurus is updated monthly. API access to the complete history of every concept in the Thesaurus is supported in caCORE EVS 3.2 and EVS/caCORE 4.x. Real-time access to the complete history of every concept provides NCI Thesaurus users with the capability to deal with change over time due to the way that information is coded or classified., averaging roughly 700 new concept and many additional changes with each release. Complete change history for each concept is provided through EVS APIs and browsers.
NCIt is registered in the HL7 OID Registry
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NCIt is one component provides the central organizing backbone for a broader range of EVS terminology resources. The NCIt is the lead reference point for the NCI Metathesaurus (NCIm), which provides rich synonymy and mappings among the codes and terms used in more than 70 biomedical terminologies. EVS browsers and LexBIG/LexEVS servers provide access to a wide variety of other terminologies and ontologies such as CTCAE, GO, ICD-9-CM, LOINC, MedDRA, SNOMED CT, and the VA's NDF-RT.
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