# NCI EVS Terminology API

**Canonical:** https://apis.io/apis/cancer-gov/evs-api/  
**Provider:** Cancer.gov — https://apis.io/providers/cancer-gov/  
**Documentation:** https://evs.nci.nih.gov/

NCI EVS Terminology API is one of 10 APIs that [Cancer.gov](https://apis.io/providers/cancer-gov/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Terminology, Vocabulary, and NCI Thesaurus. The published artifact set on APIs.io includes API documentation.

Enterprise Vocabulary Services (EVS) exposes NCI Thesaurus and NCI Metathesaurus content — over 192,000 concepts, 154,000 textual definitions, 623,000 synonyms and 630,000 inter-concept relationships — through a search and browse API used to code, analyze, and share cancer and biomedical research information.

## Machine-readable artifacts (3)

- **Documentation** — https://evs.nci.nih.gov/
- **Explorer** — https://evsexplore.semantics.cancer.gov/
- **WhitePaper** — https://evs.nci.nih.gov/ftp1/NCI_Metathesaurus/EVS%20Metathesaurus%20White%20Paper.pdf

## Other Cancer.gov APIs (9)

- [NCI Clinical Trials Search API](https://apis.io/apis/cancer-gov/clinical-trials-api/)
- [NCI Genomic Data Commons (GDC) API](https://apis.io/apis/cancer-gov/gdc-api/)
- [NCI SEER API](https://apis.io/apis/cancer-gov/seer-api/)
- [NCI MoDaC API](https://apis.io/apis/cancer-gov/modac-api/)
- [NCI Content Syndication Services](https://apis.io/apis/cancer-gov/syndication-services/)
- [Cancer.gov Diseases API](https://apis.io/apis/cancer-gov/cancer-gov-diseases-api/)
- [Cancer.gov Interventions API](https://apis.io/apis/cancer-gov/cancer-gov-interventions-api/)
- [Cancer.gov Terms API](https://apis.io/apis/cancer-gov/cancer-gov-terms-api/)
- [Cancer.gov Trials API](https://apis.io/apis/cancer-gov/cancer-gov-trials-api/)

## Tags

Terminology, Vocabulary, NCI Thesaurus

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/cancer-gov/evs-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/cancer-gov/.