# Cancer.gov Concept endpoints API

**Canonical:** https://apis.io/apis/cancer-gov/cancer-gov-concept-endpoints-api/  
**Provider:** Cancer.gov — https://apis.io/providers/cancer-gov/  
**Base URL:** https://clinicaltrialsapi.cancer.gov/api/v2  
**Documentation:** https://clinicaltrialsapi.cancer.gov/

Cancer.gov Concept endpoints API is one of 48 APIs that [Cancer.gov](https://apis.io/providers/cancer-gov/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Concept endpoints. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, rate-limit docs, and an API reference.

The Concept endpoints API from Cancer.gov — 21 operation(s) for concept endpoints.

## Operations (21)

| Method | Path | Summary |
|---|---|---|
| GET | `/api/v1/concept/{terminology}` | Get concepts specified by list parameter |
| GET | `/api/v1/concept/{terminology}/{code}` | Get the concept for the specified terminology and code |
| GET | `/api/v1/concept/{terminology}/{code}/subtree` | Get the entire subtree from the root node to the specified code |
| GET | `/api/v1/concept/{terminology}/{code}/subtree/children` | Get the entire subtree from the root node to the specified code |
| GET | `/api/v1/concept/{terminology}/{code}/roles` | Get roles for the specified terminology and code |
| GET | `/api/v1/concept/{terminology}/{code}/pathsToRoot` | Get paths to the hierarchy root from the specified code |
| GET | `/api/v1/concept/{terminology}/{code}/pathsToAncestor/{ancestorCode}` | Get paths from the specified code to the specified ancestor code |
| GET | `/api/v1/concept/{terminology}/{code}/pathsFromRoot` | Get paths from the hierarchy root to the specified concept |
| GET | `/api/v1/concept/{terminology}/{code}/parents` | Get parent concepts for the specified terminology and code |
| GET | `/api/v1/concept/{terminology}/{code}/maps` | Get maps for the specified terminology and code |
| GET | `/api/v1/concept/{terminology}/{code}/inverseRoles` | Get inverse roles for the specified terminology and code |
| GET | `/api/v1/concept/{terminology}/{code}/inverseAssociations` | Get inverse associations for the specified terminology and code |
| GET | `/api/v1/concept/{terminology}/{code}/history` | Get history for the specified terminology and code |
| GET | `/api/v1/concept/{terminology}/{code}/disjointWith` | Get "disjoint with" info for the specified terminology and code |
| GET | `/api/v1/concept/{terminology}/{code}/descendants` | Get descendant concepts for the specified terminology and code |
| GET | `/api/v1/concept/{terminology}/{code}/children` | Get child concepts for the specified terminology and code |
| GET | `/api/v1/concept/{terminology}/{code}/associations` | Get the associations for the specified terminology and code |
| GET | `/api/v1/concept/{terminology}/subsetMembers/{code}` | Get subset members for the specified terminology and code |
| GET | `/api/v1/concept/{terminology}/roots` | Get root concepts for the specified terminology |
| GET | `/api/v1/concept/{terminology}/codes` | Get all codes for the specified terminology |
| GET | `/api/v1/concept/{terminology}/associations/{codeOrLabel}` | Get the association entries for the specified terminology and code. |

## Machine-readable artifacts (21)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/cancer-gov/refs/heads/main/openapi/cancer-gov-concept-endpoints-api-openapi.yml
- **Documentation** — https://api.seer.cancer.gov/docs
- **Portal** — https://api.seer.cancer.gov/
- **TermsOfService** — https://api.seer.cancer.gov/terms
- **RateLimits** — https://raw.githubusercontent.com/api-evangelist/cancer-gov/refs/heads/main/rate-limits/cancer-gov-rate-limits.yml
- **APIReference** — https://api.seer.cancer.gov/docs
- **Documentation** — https://modac.cancer.gov/swagger-ui/4.14.0/index.html
- **Portal** — https://modac.cancer.gov/
- **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
- **APIReference** — https://api-evsrest.nci.nih.gov/swagger-ui/index.html
- **SourceCode** — https://github.com/NCIEVS/evsrestapi
- **TermsOfService** — https://evs.nci.nih.gov/ftp1/NCI_Thesaurus/ThesaurusTermsofUse.htm
- **SourceCode** — https://github.com/NCIOCPL/glossary-api
- **Documentation** — https://webapis.cancer.gov/glossary/v1/
- **SourceCode** — https://github.com/NCIOCPL/drug-dictionary-api
- **Documentation** — https://webapis.cancer.gov/drugdictionary/v1/
- **SourceCode** — https://github.com/NCIOCPL/sitewide-search-api
- **SourceCode** — https://github.com/NCIOCPL/bestbets-api
- **SourceCode** — https://github.com/NCIOCPL/r4r-api

## Other Cancer.gov APIs (12)

- [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 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/)
- [Cancer.gov Application version endpoint API](https://apis.io/apis/cancer-gov/cancer-gov-application-version-endpoint-api/)
- [Cancer.gov Asset Details Controller API](https://apis.io/apis/cancer-gov/cancer-gov-asset-details-controller-api/)
- [Cancer.gov Autosuggest API](https://apis.io/apis/cancer-gov/cancer-gov-autosuggest-api/)
- [Cancer.gov Delete Collection Controller API](https://apis.io/apis/cancer-gov/cancer-gov-delete-collection-controller-api/)
- [Cancer.gov Delete Data File Controller API](https://apis.io/apis/cancer-gov/cancer-gov-delete-data-file-controller-api/)

## Tags

Concept endpoints

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