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{
  "description": "A clinical trial study registered on ClinicalTrials.gov.",
  "properties": {
    "briefSummary": {
      "description": "Brief summary of the study purpose and design",
      "type": [
        "string",
        "null"
      ]
    },
    "completionDate": {
      "description": "Expected or actual completion date",
      "type": [
        "string",
        "null"
      ]
    },
    "conditions": {
      "description": "Conditions or diseases studied",
      "items": {
        "type": "string"
      },
      "type": "array"
    },
    "enrollmentCount": {
      "description": "Number of participants enrolled or anticipated",
      "type": [
        "integer",
        "null"
      ]
    },
    "enrollmentType": {
      "description": "Enrollment type (ACTUAL or ESTIMATED)",
      "type": [
        "string",
        "null"
      ]
    },
    "nctId": {
      "description": "ClinicalTrials.gov identifier (e.g. NCT12345678)",
      "type": "string"
    },
    "phase": {
      "description": "Study phase (e.g. PHASE1, PHASE2, PHASE3, NA)",
      "type": [
        "string",
        "null"
      ]
    },
    "sponsorId": {
      "description": "ID of the lead sponsor organization",
      "type": "string",
      "x-ref-type": "Sponsor"
    },
    "startDate": {
      "description": "Study start date",
      "type": [
        "string",
        "null"
      ]
    },
    "status": {
      "description": "Overall recruitment status (e.g. RECRUITING, COMPLETED)",
      "type": "string"
    },
    "studyType": {
      "description": "Type of study (e.g. INTERVENTIONAL, OBSERVATIONAL)",
      "type": [
        "string",
        "null"
      ]
    },
    "title": {
      "description": "Official or brief title of the study",
      "type": "string"
    },
    "url": {
      "description": "ClinicalTrials.gov URL for this study",
      "format": "uri",
      "type": "string"
    }
  },
  "required": [
    "nctId",
    "title",
    "status",
    "sponsorId"
  ],
  "type": "object"
}