Evaluate availability and prototype extraction method for Clinical Trials (CTDC) GraphQL API

[abradyGDIT]

• Discover and document prior to dev:
  • CTDC API location
  • accessor method
  • auth requirements if any
  • CTDC schema documentation

[abradyGDIT]

Update 2025-11-04:

• CTDC API location: https://clinical.datacommons.cancer.gov/v1/graphql/
• accessor method: POST JSON with query field populated with a GraphQL query and mandatory variables dictionary field populated with name:value pairs for all variables referenced in query (or with an empty dictionary if there aren't any) plus some interop-friendly HTTP headers, thus:

response = requests.post(   
    ctdc_api_url,           
    json={
        'query': query,     
        'variables': {}         
    },                              
    headers={                       
        'Content-Type': 'application/json',
        'Accept': 'application/json'
    }                           
)

• auth requirements: none
• CTDC (GraphQL API) schema: attached
• CTDC abstract data model: https://clinical.datacommons.cancer.gov/#/data-model