EVS creates, compiles, and cross-maps biomedical terminology needed by NCI and its community. EVS publishes NCI Thesaurus (NCIt) as its core reference terminology and biomedical ontology, as well as NCI Metathesaurus (NCIm), which provides cross-mappings to more than 70 than 101 terminologies. EVS also makes available standalone versions of other terminologies and ontologies, as well as many specialized mappings and value sets.
- 110160,000 key biomedical concepts with a rich set of terms, codes, 127,000 textual definitions, and over 400over 525,000 864 inter-concept relationships. NCIt combined and extended core NCI terminologies within a scientifically and technically rigorous framework. NCIt is now a broadly shared coding and semantic infrastructure resource – nearly – over half of NCIt concepts include content explicitly tagged by one or more EVS partners (see the ). is NCI's reference terminology and core biomedical ontology, covering some
- over 75 over 101 biomedical terminologies, whose 4whose 8,000,000 terms are mapped to 2to 3,000600,000 concepts representing their shared meanings. NCIm contains most terminologies used by NCI for clinical care, translational and basic research, and provides a rich source of definitions, synonyms, codes, and other information. NCIm starts from a subset of NLM's UMLS Metathesaurus, and modifies and extends it with many additional sources. provides a broad, concept-based mapping of terms from
- : EVS licenses, processes and makes available individually through EVS systems, many other terminologies of special interest to NCI and the research community. EVS has helped create, harmonize with, and publish several of these terminologies. publishes all terminologies hosted by NCI EVS in an integrated environment, providing search, cross-links, and a user friendly interface to ICD-9-CM, CTCAE, MedDRA, SNOMED CT, NDF-RT, GO, and many other terminologies and ontologies used by NCI and its partners.
- : Pairwise mappings between several supported terminologies have also been created and published to support data translation and cross-reference. As with standalone terminologies above, such mappings generally reflect special EVS community interests and collaborations.
- and and Data Standards: EVS works with many partners to create and support standardized terminology for biomedical coding. Hundreds of NCIt subsets and other code lists are maintained by EVS, and most are now available as CTS 2 value sets following the draft . In caDSR, they provide a pre-curated standard set of meanings for use by metadata curators. More than 200 than 1300 value sets are currently defined in EVS, most as subsets of NCIt covering a range of standards from many EVS partners. Key EVS supported terminology standards include:
than 15than 25,000 FDA terms and codes are stored in NCIt.: EVS is working with the U.S. Food and Drug Administration (FDA) to develop and support controlled terminology in several areas. More
: EVS is also a partner in the Federal Medication (FedMed) collaboration, which is developing shared FedMed Terminology (FMT) and standards to improve the exchange and public availability of medication information.
: The Clinical Data Interchange Standards Consortium (CDISC) -- an international, non-profit organization that develops and supports global data standards for medical research -- has chosen EVS as its terminology partner.
: The National Council for Prescription Drug Programs (NCPDP) creates and promotes the transfer of data related to medications, supplies, and services through the development of standards and industry guidance, and now uses NCIt in two of its standards.
: The National Institute of Child Health and Human Development (NICHD) and EVS are working with numerous contributors from national and international academic, clinical and research institutions to provide standardized terminology for coding pediatric clinical trials and other research activities.
Making these terminology resources more easily available, mapping between them, harmonizing coding standards, and promoting agreement on best practices, are all core EVS priorities.