Cancer.gov Diseases API
The Diseases API from Cancer.gov — 1 operation(s) for diseases.
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OpenAPI Specification
openapi: 3.2.0
info:
title: NCI Clinical Trials Search Diseases API
description: 'RESTful API for searching NCI-supported cancer clinical trials data
sourced from NCI''s Clinical Trials Reporting Program (CTRP). This is
the same API that powers NCI''s public Clinical Trials Search at
cancer.gov. A free API key is required and must be sent in the
X-API-KEY header; developers register through the CTS Developer
Accounts portal at https://clinicaltrialsapi.cancer.gov/.
This is a best-effort, hand-authored specification covering the
documented v2 endpoints (trials, interventions, diseases, terms).
Request and response payloads use permissive schemas where the full
property set is not enumerated in public documentation.
'
version: v2
contact:
name: NCI Clinical Trials API
url: https://clinicaltrialsapi.cancer.gov/
x-generated-from: documentation
x-apis-io-method: generated
x-apis-io-note: 'Hand-authored by API Evangelist from NCI documentation, NOT harvested from NCI. NCI
publishes no machine-readable contract for the Clinical Trials Search API: clinicaltrialsapi.cancer.gov
is a single-page application that returns an HTML shell at HTTP 200 for /openapi.json, /swagger.json,
/api-docs and /v3/api-docs (probed 2026-09-05). Verify field names against a live response.'
servers:
- url: https://clinicaltrialsapi.cancer.gov/api/v2
security:
- apiKey: []
tags:
- name: Diseases
paths:
/diseases:
get:
tags:
- Diseases
summary: List or search diseases
parameters:
- in: query
name: name
schema:
type: string
- in: query
name: type
schema:
type: string
- in: query
name: size
schema:
type: integer
default: 10
- in: query
name: from
schema:
type: integer
default: 0
responses:
'200':
description: Disease search results.
content:
application/json:
schema:
$ref: '#/components/schemas/PagedResults'
components:
schemas:
PagedResults:
type: object
properties:
total:
type: integer
data:
type: array
items:
type: object
additionalProperties: true
additionalProperties: true
securitySchemes:
apiKey:
type: apiKey
in: header
name: X-API-KEY
description: Free API key issued by the CTS Developer Accounts portal.