{
  "schema_version": "2.0",
  "record_type": "dataset",
  "tier": "practical",
  "slug": "clinicaltrials-gov",
  "name": "ClinicalTrials.gov",
  "summary": {
    "en": "License: unstated (NOASSERTION); Mdexa hosting: pending. the official terms say the data are free to use but not whether commercial use or redistribution is allowed: unstated, terms present (Article 24)",
    "zh": "许可证声明：未声明（NOASSERTION）；本站处理：待确认，暂只链接原出处。官方条款说可免费使用，但未说明能否商用或再分发：未声明，条款在场（第 24 条）。"
  },
  "systems": [
    "modern-medicine"
  ],
  "domains": [
    "clinical-medicine",
    "pharmacy-drugs"
  ],
  "content_types": [
    "registry"
  ],
  "content_description": {
    "en": "ClinicalTrials.gov contains summary information about clinical studies being conducted throughout the United States and in many countries throughout the world. It is updated daily.",
    "zh": "ClinicalTrials.gov 收录美国及世界多国正在开展的临床研究的概要信息，并每日更新。"
  },
  "languages": [
    "en"
  ],
  "modalities": [
    "text"
  ],
  "size": {
    "raw": "{\"totalStudies\":611552,\"averageSizeBytes\":17327",
    "measures": []
  },
  "publisher": "U.S. National Library of Medicine",
  "year": {
    "value": null,
    "raw": null
  },
  "license": {
    "legacy_status": "pending",
    "spdx": "NOASSERTION",
    "commercial_use": "unstated",
    "derivatives": "conditional",
    "redistribution": "unstated",
    "rationale": {
      "en": "the official terms say the data are free to use but not whether commercial use or redistribution is allowed: unstated, terms present (Article 24)",
      "zh": "官方条款说可免费使用，但未说明能否商用或再分发：未声明，条款在场（第 24 条）"
    },
    "evidence": [
      {
        "location": "terms-page",
        "location_detail": {
          "en": "Statement found in snapshot s09 (terms-page)",
          "zh": "在快照 s09（terms-page）中找到的声明"
        },
        "excerpt": "The following Terms and Conditions apply for use of ClinicalTrials.gov data. Downloading ClinicalTrials.gov data indicates your acceptance of the following Terms and Conditions.",
        "url": "https://clinicaltrials.gov/about-site/terms-conditions",
        "verified_on": "2026-11-13",
        "snapshot_id": "s09",
        "observed": "page",
        "captured_by": "browser-agent",
        "capturer": "browser-agent",
        "captured_at": "2026-11-13",
        "page_title": "Terms and Conditions | ClinicalTrials.gov",
        "final_url": "https://clinicaltrials.gov/about-site/terms-conditions",
        "text_sha256": "b82a6db179dc6efec42b2394e338a7d3a69eac9f9e3eefce21de486418cf5ec5"
      },
      {
        "location": "terms-page",
        "location_detail": {
          "en": "Statement found in snapshot s09 (terms-page)",
          "zh": "在快照 s09（terms-page）中找到的声明"
        },
        "excerpt": "ClinicalTrials.gov data are available to all requesters, both within and outside the United States, at no charge.",
        "url": "https://clinicaltrials.gov/about-site/terms-conditions",
        "verified_on": "2026-11-13",
        "snapshot_id": "s09",
        "observed": "page",
        "captured_by": "browser-agent",
        "capturer": "browser-agent",
        "captured_at": "2026-11-13",
        "page_title": "Terms and Conditions | ClinicalTrials.gov",
        "final_url": "https://clinicaltrials.gov/about-site/terms-conditions",
        "text_sha256": "b82a6db179dc6efec42b2394e338a7d3a69eac9f9e3eefce21de486418cf5ec5"
      },
      {
        "location": "terms-page",
        "location_detail": {
          "en": "Statement found in snapshot s09 (terms-page)",
          "zh": "在快照 s09（terms-page）中找到的声明"
        },
        "excerpt": "Attribute the source of the data as ClinicalTrials.gov",
        "url": "https://clinicaltrials.gov/about-site/terms-conditions",
        "verified_on": "2026-11-13",
        "snapshot_id": "s09",
        "observed": "page",
        "captured_by": "browser-agent",
        "capturer": "browser-agent",
        "captured_at": "2026-11-13",
        "page_title": "Terms and Conditions | ClinicalTrials.gov",
        "final_url": "https://clinicaltrials.gov/about-site/terms-conditions",
        "text_sha256": "b82a6db179dc6efec42b2394e338a7d3a69eac9f9e3eefce21de486418cf5ec5"
      },
      {
        "location": "terms-page",
        "location_detail": {
          "en": "Statement found in snapshot s09 (terms-page)",
          "zh": "在快照 s09（terms-page）中找到的声明"
        },
        "excerpt": "You shall not assert any proprietary rights to any portion of the database, or represent the database or any part thereof to anyone as other than a United States Government database.",
        "url": "https://clinicaltrials.gov/about-site/terms-conditions",
        "verified_on": "2026-11-13",
        "snapshot_id": "s09",
        "observed": "page",
        "captured_by": "browser-agent",
        "capturer": "browser-agent",
        "captured_at": "2026-11-13",
        "page_title": "Terms and Conditions | ClinicalTrials.gov",
        "final_url": "https://clinicaltrials.gov/about-site/terms-conditions",
        "text_sha256": "b82a6db179dc6efec42b2394e338a7d3a69eac9f9e3eefce21de486418cf5ec5"
      },
      {
        "location": "terms-page",
        "location_detail": {
          "en": "Statement found in snapshot s09 (terms-page)",
          "zh": "在快照 s09（terms-page）中找到的声明"
        },
        "excerpt": "You shall not use any email addresses extracted from our database for marketing or other promotional purposes.",
        "url": "https://clinicaltrials.gov/about-site/terms-conditions",
        "verified_on": "2026-11-13",
        "snapshot_id": "s09",
        "observed": "page",
        "captured_by": "browser-agent",
        "capturer": "browser-agent",
        "captured_at": "2026-11-13",
        "page_title": "Terms and Conditions | ClinicalTrials.gov",
        "final_url": "https://clinicaltrials.gov/about-site/terms-conditions",
        "text_sha256": "b82a6db179dc6efec42b2394e338a7d3a69eac9f9e3eefce21de486418cf5ec5"
      },
      {
        "location": "terms-page",
        "location_detail": {
          "en": "Statement found in snapshot s09 (terms-page)",
          "zh": "在快照 s09（terms-page）中找到的声明"
        },
        "excerpt": "The ClinicalTrials.gov data carry an international copyright outside the United States and its Territories or Possessions. Some ClinicalTrials.gov data may be subject to the copyright of third parties; you should consult these entities for any additional terms of use.",
        "url": "https://clinicaltrials.gov/about-site/terms-conditions",
        "verified_on": "2026-11-13",
        "snapshot_id": "s09",
        "observed": "page",
        "captured_by": "browser-agent",
        "capturer": "browser-agent",
        "captured_at": "2026-11-13",
        "page_title": "Terms and Conditions | ClinicalTrials.gov",
        "final_url": "https://clinicaltrials.gov/about-site/terms-conditions",
        "text_sha256": "b82a6db179dc6efec42b2394e338a7d3a69eac9f9e3eefce21de486418cf5ec5"
      },
      {
        "location": "terms-page",
        "location_detail": {
          "en": "Statement found in snapshot s09 (terms-page)",
          "zh": "在快照 s09（terms-page）中找到的声明"
        },
        "excerpt": "Update the data such that they are current at all times",
        "url": "https://clinicaltrials.gov/about-site/terms-conditions",
        "verified_on": "2026-11-13",
        "snapshot_id": "s09",
        "observed": "page",
        "captured_by": "browser-agent",
        "capturer": "browser-agent",
        "captured_at": "2026-11-13",
        "page_title": "Terms and Conditions | ClinicalTrials.gov",
        "final_url": "https://clinicaltrials.gov/about-site/terms-conditions",
        "text_sha256": "b82a6db179dc6efec42b2394e338a7d3a69eac9f9e3eefce21de486418cf5ec5"
      },
      {
        "location": "terms-page",
        "location_detail": {
          "en": "Statement found in snapshot s09 (terms-page)",
          "zh": "在快照 s09（terms-page）中找到的声明"
        },
        "excerpt": "Clearly display the date the data were processed by ClinicalTrials.gov",
        "url": "https://clinicaltrials.gov/about-site/terms-conditions",
        "verified_on": "2026-11-13",
        "snapshot_id": "s09",
        "observed": "page",
        "captured_by": "browser-agent",
        "capturer": "browser-agent",
        "captured_at": "2026-11-13",
        "page_title": "Terms and Conditions | ClinicalTrials.gov",
        "final_url": "https://clinicaltrials.gov/about-site/terms-conditions",
        "text_sha256": "b82a6db179dc6efec42b2394e338a7d3a69eac9f9e3eefce21de486418cf5ec5"
      },
      {
        "location": "terms-page",
        "location_detail": {
          "en": "Statement found in snapshot s09 (terms-page)",
          "zh": "在快照 s09（terms-page）中找到的声明"
        },
        "excerpt": "State any modifications made to the content of the data, along with a complete description of the modifications",
        "url": "https://clinicaltrials.gov/about-site/terms-conditions",
        "verified_on": "2026-11-13",
        "snapshot_id": "s09",
        "observed": "page",
        "captured_by": "browser-agent",
        "capturer": "browser-agent",
        "captured_at": "2026-11-13",
        "page_title": "Terms and Conditions | ClinicalTrials.gov",
        "final_url": "https://clinicaltrials.gov/about-site/terms-conditions",
        "text_sha256": "b82a6db179dc6efec42b2394e338a7d3a69eac9f9e3eefce21de486418cf5ec5"
      },
      {
        "location": "terms-page",
        "location_detail": {
          "en": "Statement found in snapshot s09 (terms-page)",
          "zh": "在快照 s09（terms-page）中找到的声明"
        },
        "excerpt": "These terms and conditions are in effect as long as the user retains any of the data obtained from ClinicalTrials.gov.",
        "url": "https://clinicaltrials.gov/about-site/terms-conditions",
        "verified_on": "2026-11-13",
        "snapshot_id": "s09",
        "observed": "page",
        "captured_by": "browser-agent",
        "capturer": "browser-agent",
        "captured_at": "2026-11-13",
        "page_title": "Terms and Conditions | ClinicalTrials.gov",
        "final_url": "https://clinicaltrials.gov/about-site/terms-conditions",
        "text_sha256": "b82a6db179dc6efec42b2394e338a7d3a69eac9f9e3eefce21de486418cf5ec5"
      }
    ],
    "license_conditions": [
      "attribution",
      "state-modifications",
      "keep-current"
    ],
    "check_exceptions": true,
    "custom_license": true,
    "third_party_rights_notice": true,
    "terms_present": true,
    "review": {
      "method": "rules-plus-second-pass-model",
      "method_label": {
        "en": "Judged by public rules and checked a second time before listing.",
        "zh": "按公开规则判定，经二次核对后收录。"
      },
      "readings": [
        {
          "restatement": {
            "en": "the official terms say the data are free to use but not whether commercial use or redistribution is allowed: unstated, terms present (Article 24)",
            "zh": "官方条款说可免费使用，但未说明能否商用或再分发：未声明，条款在场（第 24 条）"
          },
          "quotes": [
            {
              "excerpt": "The following Terms and Conditions apply for use of ClinicalTrials.gov data. Downloading ClinicalTrials.gov data indicates your acceptance of the following Terms and Conditions.",
              "snapshot_id": "s09",
              "url": "https://clinicaltrials.gov/about-site/terms-conditions"
            },
            {
              "excerpt": "ClinicalTrials.gov data are available to all requesters, both within and outside the United States, at no charge.",
              "snapshot_id": "s09",
              "url": "https://clinicaltrials.gov/about-site/terms-conditions"
            },
            {
              "excerpt": "Attribute the source of the data as ClinicalTrials.gov",
              "snapshot_id": "s09",
              "url": "https://clinicaltrials.gov/about-site/terms-conditions"
            },
            {
              "excerpt": "You shall not assert any proprietary rights to any portion of the database, or represent the database or any part thereof to anyone as other than a United States Government database.",
              "snapshot_id": "s09",
              "url": "https://clinicaltrials.gov/about-site/terms-conditions"
            }
          ],
          "values": {
            "license_status": "unstated",
            "commercial_use": "unstated",
            "derivatives": "conditional",
            "redistribution": "unstated"
          },
          "source": "rules"
        }
      ],
      "adopted": 0,
      "second_pass": {
        "reviewer": "model-second-pass",
        "reviewed_at": "2026-11-13",
        "overall": "stricter",
        "agreed": true,
        "disagreement": null,
        "missed_restrictions": [
          {
            "excerpt": "You shall not use any email addresses extracted from our database for marketing or other promotional purposes.",
            "snapshot_id": "s09",
            "effect": "用途禁止（不得将提取的邮箱用于营销推广）：属限定性条款，影响 license_status，应为 restricted；第一遍列为证据但未计入状态。",
            "class": "B"
          },
          {
            "excerpt": "Update the data such that they are current at all times",
            "snapshot_id": "s09",
            "effect": "影响 license_conditions：加 notice-required（保持数据最新）。",
            "class": "B"
          },
          {
            "excerpt": "Clearly display the date the data were processed by ClinicalTrials.gov",
            "snapshot_id": "s09",
            "effect": "影响 license_conditions：加 notice-required（标明处理日期）。",
            "class": "B"
          },
          {
            "excerpt": "State any modifications made to the content of the data, along with a complete description of the modifications",
            "snapshot_id": "s09",
            "effect": "影响 derivatives：conditional（须注明改动）；license_conditions 加 notice-required。",
            "class": "B"
          },
          {
            "excerpt": "These terms and conditions are in effect as long as the user retains any of the data obtained from ClinicalTrials.gov.",
            "snapshot_id": "s09",
            "effect": "存续条款：只要保留数据条款即持续有效，再分发与托管时条件随数据延续；影响 redistribution 取 conditional。",
            "class": "A?"
          }
        ],
        "routing": [
          "license_status: the reviewer's quote is not a class A sentence (Article 23), so the value is not changed",
          "derivatives: the reviewer's quote is not a class A sentence (Article 23), so the value is not changed",
          "redistribution: the reviewer's quote is not a class A sentence (Article 23), so the value is not changed",
          "missed sentence, class B: You shall not use any email addresses extracted from our database for marketing or other p",
          "missed sentence, class B: Update the data such that they are current at all times",
          "missed sentence, class B: Clearly display the date the data were processed by ClinicalTrials.gov",
          "missed sentence, class B: State any modifications made to the content of the data, along with a complete description",
          "missed sentence, class A?: These terms and conditions are in effect as long as the user retains any of the data obtai"
        ]
      }
    }
  },
  "license_status": "unstated",
  "hosting": "pending",
  "hosting_reason": {
    "en": "License unstated, judged by public rules and checked by a second-pass model. The license question stays open.",
    "zh": "许可证状态：unstated，按公开规则判定并经第二遍模型复核。许可问题仍未解决。"
  },
  "signoff": null,
  "risk_flags": [],
  "provenance": {
    "source_description": null,
    "upstream": []
  },
  "known_issues": [
    {
      "en": "No warranties are made and no liability is assumed for use of the data.",
      "zh": "对本数据库及其使用结果不作任何保证，也不承担任何责任。"
    },
    {
      "en": "Some data may be subject to third-party copyright; users must consult those parties for additional terms.",
      "zh": "部分数据可能受第三方版权限制，用户须向相关方咨询附加使用条款。"
    },
    {
      "en": "The database is updated daily and users are advised to check frequently for current information.",
      "zh": "该数据库每日更新，用户应经常查看以获取最新信息。"
    }
  ],
  "preflight": {
    "status": "not-run"
  },
  "access": {
    "mdexa_download": null,
    "external_urls": [
      "https://clinicaltrials.gov/",
      "https://clinicaltrials.gov/about-site/terms-conditions"
    ],
    "notes": null
  },
  "citation": {
    "text": null,
    "references": []
  },
  "verification_level": "partially-verified",
  "last_verified": "2026-11-13",
  "tags": [
    {
      "facet": "intended_use",
      "value": "retrieval-kb",
      "basis": "inferred",
      "inferred_from": "card-content-description",
      "excerpt": "has developed ClinicalTrials.gov to provide patients, family members, and members of the public current information about clinical research studies",
      "snapshot_id": "s09"
    },
    {
      "facet": "specialty",
      "value": "multi-specialty",
      "basis": "inferred",
      "inferred_from": "card-content-description",
      "excerpt": "contains summary information about clinical studies being conducted throughout the United States and in many countries throughout the world",
      "snapshot_id": "s09"
    },
    {
      "facet": "source_type",
      "value": "knowledge-base",
      "basis": "inferred",
      "inferred_from": "snapshot-structure",
      "excerpt": "Purpose of the ClinicalTrials.gov database",
      "snapshot_id": "s09"
    }
  ],
  "changelog": [
    {
      "date": "2026-11-13",
      "change": {
        "en": "Listed on 2026-11-13. Judged by public rules and checked a second time before listing.",
        "zh": "2026-11-13 上架。按公开规则判定，经二次核对后收录。"
      }
    },
    {
      "date": "2026-11-13",
      "change": {
        "en": "Known defects, version notes and access statements from cited sources (papers, release notes, official pages) were added; each shows who said it, when, and what kind of source it is.",
        "zh": "补入来自所引来源（论文、发布说明、官方页面）的已知缺陷、版本说明与取用方式，每条标明出自谁、何时、来源类型。"
      }
    },
    {
      "date": "2026-11-14",
      "change": {
        "en": "Known defects, version notes and access statements from cited sources (papers, release notes, official pages) were added; each shows who said it, when, and what kind of source it is.",
        "zh": "补入来自所引来源（论文、发布说明、官方页面）的已知缺陷、版本说明与取用方式，每条标明出自谁、何时、来源类型。"
      }
    },
    {
      "date": "2026-11-14",
      "change": {
        "en": "Known defects, version notes and access statements from cited sources (papers, release notes, official pages) were added; each shows who said it, when, and what kind of source it is.",
        "zh": "补入来自所引来源（论文、发布说明、官方页面）的已知缺陷、版本说明与取用方式，每条标明出自谁、何时、来源类型。"
      }
    },
    {
      "date": "2026-11-14",
      "change": {
        "en": "Known defects, version notes and access statements from cited sources (papers, release notes, official pages) were added; each shows who said it, when, and what kind of source it is.",
        "zh": "补入来自所引来源（论文、发布说明、官方页面）的已知缺陷、版本说明与取用方式，每条标明出自谁、何时、来源类型。"
      }
    },
    {
      "date": "2026-11-14",
      "change": {
        "en": "Known defects, version notes and access statements from cited sources (papers, release notes, official pages) were added; each shows who said it, when, and what kind of source it is.",
        "zh": "补入来自所引来源（论文、发布说明、官方页面）的已知缺陷、版本说明与取用方式，每条标明出自谁、何时、来源类型。"
      }
    },
    {
      "date": "2026-11-14",
      "change": {
        "en": "Known defects, version notes and access statements from cited sources (papers, release notes, official pages) were added; each shows who said it, when, and what kind of source it is.",
        "zh": "补入来自所引来源（论文、发布说明、官方页面）的已知缺陷、版本说明与取用方式，每条标明出自谁、何时、来源类型。"
      }
    },
    {
      "date": "2026-11-14",
      "change": {
        "en": "Practical fields (scope, identifiers, access methods, versions, known defects) were added by the automated pipeline from stored page snapshots; every statement carries a verbatim quote.",
        "zh": "实用卡字段（内容范围、标识符、取用方式、版本、已知缺陷）由自动流水线根据已存快照添加，每条陈述带逐字引文。"
      }
    },
    {
      "date": "2026-11-14",
      "change": {
        "en": "Known defects, version notes and access statements from cited sources (papers, release notes, official pages) were added; each shows who said it, when, and what kind of source it is.",
        "zh": "补入来自所引来源（论文、发布说明、官方页面）的已知缺陷、版本说明与取用方式，每条标明出自谁、何时、来源类型。"
      }
    }
  ],
  "practical": {
    "content_scope": {
      "entities": [
        {
          "kind": "clinical study",
          "count": 611552,
          "count_as_of": null,
          "statement": {
            "text": {
              "en": "The API size statistics report 611552 total studies.",
              "zh": "API 规模统计报告共有 611552 项研究。"
            },
            "evidence": [
              {
                "location": "api-doc",
                "excerpt": "\"totalStudies\":611552",
                "url": "https://clinicaltrials.gov/api/v2/stats/size",
                "snapshot_id": "s05",
                "char_start": 1,
                "verified_on": "2026-11-13",
                "observed": "page",
                "captured_by": "pipeline"
              }
            ]
          }
        }
      ],
      "coverage": [
        {
          "text": {
            "en": "The text states that ClinicalTrials.gov contains summary information about clinical studies conducted throughout the United States and in many countries worldwide.",
            "zh": "文本指出，ClinicalTrials.gov 包含在美国以及世界许多国家开展的临床研究的概要信息。"
          },
          "evidence": [
            {
              "location": "terms-page",
              "excerpt": "ClinicalTrials.gov contains summary information about clinical studies being conducted throughout the United States and in many countries throughout the world.",
              "url": "https://clinicaltrials.gov/about-site/terms-conditions",
              "snapshot_id": "s09",
              "char_start": 658,
              "verified_on": "2026-11-13",
              "observed": "page",
              "captured_by": "browser-agent"
            }
          ]
        }
      ]
    },
    "identifiers": {
      "schemes": [
        {
          "name": "NCT identifier",
          "bioregistry_prefix": null,
          "applies_to": "clinical studies",
          "statement": {
            "text": {
              "en": "The statistics list studies under identifiers such as NCT02723955.",
              "zh": "统计信息以 NCT02723955 这类标识符列出研究。"
            },
            "evidence": [
              {
                "location": "api-doc",
                "excerpt": "\"id\":\"NCT02723955\"",
                "url": "https://clinicaltrials.gov/api/v2/stats/size",
                "snapshot_id": "s05",
                "char_start": 6940,
                "verified_on": "2026-11-13",
                "observed": "page",
                "captured_by": "pipeline"
              }
            ]
          }
        }
      ],
      "crosswalks": [],
      "mismatch_cases": [],
      "notes": [
        {
          "text": {
            "en": "Tse et al.: the WHO ICTRP portal links duplicate registrations of one study across registries only when sponsors list the other registry IDs, missing other duplicates, which affects counts.",
            "zh": "Tse 等：WHO ICTRP 门户只有在申办方填写了其他注册号时才能识别同一研究在多个注册库的重复登记，其余重复会漏判，影响各类计数。"
          },
          "evidence": [
            {
              "location": "peer-reviewed-paper",
              "excerpt": "The WHO ICTRP search portal identifies single studies registered in two or more registries (that is, duplicate registrations) only when sponsors or investigators list unique registry identifiers on corresponding study records, but misses other duplicate registrations.",
              "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5968400/",
              "snapshot_id": "s11",
              "char_start": 16237,
              "verified_on": "2026-11-13",
              "observed": "page",
              "source_work": {
                "title": "How to avoid common problems when using ClinicalTrials.gov in research: 10 issues to consider",
                "authors_or_org": "Tse T, Fain KM, Zarin DA (BMJ)",
                "date": "2018-05-25",
                "date_as_written": "2018-05-25",
                "source_type": "peer-reviewed-paper",
                "open_access": true,
                "doi_or_url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5968400/"
              }
            }
          ]
        }
      ]
    },
    "access_methods": [
      {
        "method": "web-api",
        "url": "https://clinicaltrials.gov/api/v2/version",
        "formats": [
          "JSON"
        ],
        "limits": [],
        "terms": {
          "same_as_card_license": true,
          "own_terms": null
        },
        "reachable": {
          "status": 200,
          "checked_on": "2026-11-14"
        }
      },
      {
        "method": "web-api",
        "url": "https://clinicaltrials.gov/api/v2",
        "formats": [],
        "auth": "none",
        "limits": [],
        "terms": {
          "same_as_card_license": true,
          "own_terms": null
        },
        "reachable": {
          "status": 404,
          "checked_on": "2026-11-14"
        }
      }
    ],
    "versioning": {
      "latest": {
        "label": "2026-11",
        "released_on": "2026-11-12",
        "statement": {
          "text": {
            "en": "There are no numbered data releases; the API's version endpoint reports the dataset posting time (on the check date: dataTimestamp 2026-11-12T10:00:05, API version 2.0.5).",
            "zh": "无编号数据版本；API 的 version 接口给出数据集发布时间（查证当日 dataTimestamp 为 2026-11-12T10:00:05，API 版本 2.0.5）。"
          },
          "evidence": [
            {
              "location": "dataset-page",
              "excerpt": "\"dataTimestamp\" : \"2026-11-12T10:00:05\"",
              "url": "https://clinicaltrials.gov/api/v2/version",
              "snapshot_id": "s10",
              "char_start": 30,
              "verified_on": "2026-11-13",
              "observed": "page",
              "source_work": {
                "title": "ClinicalTrials.gov API v2 /version endpoint",
                "authors_or_org": "U.S. National Library of Medicine",
                "date": "2026-11-12",
                "date_as_written": "2026-11-12",
                "source_type": "official-page",
                "open_access": true,
                "doi_or_url": "https://clinicaltrials.gov/api/v2/version"
              }
            }
          ]
        }
      },
      "update_cycle": {
        "cycle": "daily",
        "statement": {
          "text": {
            "en": "The text states that ClinicalTrials.gov is updated daily.",
            "zh": "文本指出，ClinicalTrials.gov 每日更新。"
          },
          "evidence": [
            {
              "location": "terms-page",
              "excerpt": "ClinicalTrials.gov is updated daily.",
              "url": "https://clinicaltrials.gov/about-site/terms-conditions",
              "snapshot_id": "s09",
              "char_start": 953,
              "verified_on": "2026-11-13",
              "observed": "page",
              "captured_by": "browser-agent"
            }
          ]
        }
      },
      "breaking_changes": [
        {
          "version": "unspecified",
          "date": "2024-06-25",
          "kind": "identifier",
          "statement": {
            "text": {
              "en": "The classic ClinicalTrials.gov website and its API were retired on 25 June 2024.",
              "zh": "ClinicalTrials.gov 旧版网站及其 API 于 2024-06-25 停用。"
            },
            "evidence": [
              {
                "location": "official-change-notice",
                "excerpt": "Effective today, the classic ClinicalTrials.gov website and its application programming interface (API) are retired and no longer available.",
                "url": "https://nlm.nih.gov/pubs/techbull/mj24/mj24_Modern_Clinical_Trials_Website.html",
                "snapshot_id": "s12",
                "char_start": 1549,
                "verified_on": "2026-11-13",
                "observed": "page",
                "source_work": {
                  "title": "A Modern ClinicalTrials.gov Website (NLM Tech Bull. 2024 May-Jun;(458):e8)",
                  "authors_or_org": "U.S. National Library of Medicine",
                  "date": "2024-06-25",
                  "date_as_written": "2024-06-25",
                  "source_type": "official-change-notice",
                  "open_access": true,
                  "doi_or_url": "https://nlm.nih.gov/pubs/techbull/mj24/mj24_Modern_Clinical_Trials_Website.html"
                }
              }
            ]
          }
        }
      ],
      "history_url": null,
      "notes": [
        {
          "text": {
            "en": "Records change over time (e.g. recruitment status), so Tse, Fain and Zarin advise saving extracted data and stating the extraction date in manuscripts.",
            "zh": "记录会随时间改变（如招募状态），Tse、Fain、Zarin 建议保存所提取的数据，并在论文中写明提取日期。"
          },
          "evidence": [
            {
              "location": "peer-reviewed-paper",
              "excerpt": "They also need to state clearly in their manuscripts when the data were extracted for analysis.",
              "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5968400/",
              "snapshot_id": "s11",
              "char_start": 28746,
              "verified_on": "2026-11-13",
              "observed": "page",
              "source_work": {
                "title": "How to avoid common problems when using ClinicalTrials.gov in research: 10 issues to consider",
                "authors_or_org": "Tse T, Fain KM, Zarin DA (BMJ)",
                "date": "2018-05-25",
                "date_as_written": "2018-05-25",
                "source_type": "peer-reviewed-paper",
                "open_access": true,
                "doi_or_url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5968400/"
              }
            }
          ]
        }
      ]
    },
    "known_defects": [
      {
        "kind": "other",
        "statement": {
          "text": {
            "en": "Tse et al.: many records are not updated in time; as of February 2018 about 9.4% of records had 'unknown' recruitment status, meaning not updated or verified for two years.",
            "zh": "Tse 等：许多记录未及时更新；截至 2018 年 2 月约 9.4% 的记录招募状态为“unknown”，即两年内未更新或核实。"
          },
          "evidence": [
            {
              "location": "peer-reviewed-paper",
              "excerpt": "Despite the capability to make changes to a record, many records are not updated in a timely way.",
              "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5968400/",
              "snapshot_id": "s11",
              "char_start": 28842,
              "verified_on": "2026-11-13",
              "observed": "page",
              "source_work": {
                "title": "How to avoid common problems when using ClinicalTrials.gov in research: 10 issues to consider",
                "authors_or_org": "Tse T, Fain KM, Zarin DA (BMJ)",
                "date": "2018-05-25",
                "date_as_written": "2018-05-25",
                "source_type": "peer-reviewed-paper",
                "open_access": true,
                "doi_or_url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5968400/"
              }
            }
          ]
        },
        "source_kind": "peer-reviewed-paper",
        "scope": null,
        "attribution": {
          "who": "Tse T, Fain KM, Zarin DA (BMJ)",
          "when": "2018-05-25",
          "source_type": "peer-reviewed-paper",
          "title": "How to avoid common problems when using ClinicalTrials.gov in research: 10 issues to consider"
        },
        "correction_entrance": "Report an error through the publisher or the authors: https://pmc.ncbi.nlm.nih.gov/articles/PMC5968400/"
      },
      {
        "kind": "other",
        "statement": {
          "text": {
            "en": "Tse et al.: complete, accurate registration and results reporting depend on consistent reporting by sponsors and investigators.",
            "zh": "Tse 等：注册信息与结果的完整准确取决于申办方和研究者是否持续一致地报告。"
          },
          "evidence": [
            {
              "location": "peer-reviewed-paper",
              "excerpt": "Achieving these goals depends on consistent and systematic reporting by sponsors and investigators.",
              "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5968400/",
              "snapshot_id": "s11",
              "char_start": 6210,
              "verified_on": "2026-11-13",
              "observed": "page",
              "source_work": {
                "title": "How to avoid common problems when using ClinicalTrials.gov in research: 10 issues to consider",
                "authors_or_org": "Tse T, Fain KM, Zarin DA (BMJ)",
                "date": "2018-05-25",
                "date_as_written": "2018-05-25",
                "source_type": "peer-reviewed-paper",
                "open_access": true,
                "doi_or_url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5968400/"
              }
            }
          ]
        },
        "source_kind": "peer-reviewed-paper",
        "scope": null,
        "attribution": {
          "who": "Tse T, Fain KM, Zarin DA (BMJ)",
          "when": "2018-05-25",
          "source_type": "peer-reviewed-paper",
          "title": "How to avoid common problems when using ClinicalTrials.gov in research: 10 issues to consider"
        },
        "correction_entrance": "Report an error through the publisher or the authors: https://pmc.ncbi.nlm.nih.gov/articles/PMC5968400/"
      }
    ],
    "fit": {
      "suited_for": [
        {
          "text": {
            "en": "The text states that the National Institutes of Health developed ClinicalTrials.gov to provide patients, family members, and members of the public with current information about clinical research studies.",
            "zh": "文本指出，美国国立卫生研究院建立 ClinicalTrials.gov 是为了向患者、家属和公众提供关于临床研究的当前信息。"
          },
          "evidence": [
            {
              "location": "terms-page",
              "excerpt": "The U.S. National Institutes of Health, Department of Health and Human Services, through its National Library of Medicine, has developed ClinicalTrials.gov to provide patients, family members, and members of the public current information about clinical research studies.",
              "url": "https://clinicaltrials.gov/about-site/terms-conditions",
              "snapshot_id": "s09",
              "char_start": 386,
              "verified_on": "2026-11-13",
              "observed": "page",
              "captured_by": "browser-agent"
            }
          ]
        }
      ],
      "not_suited_for": []
    },
    "commercial_access": {
      "route": "unknown",
      "url": null,
      "statement": null
    },
    "completeness": {
      "core_complete": true,
      "literature_defects": 2,
      "reachable_access": 1,
      "meets_practical_bar": true,
      "gaps": [
        {
          "field": "fit.not_suited_for",
          "note": "未找到有出处的说明 / no sourced statement found"
        },
        {
          "field": "commercial_access",
          "note": "未找到有出处的说明 / no sourced statement found"
        }
      ]
    }
  },
  "access_recipe": {
    "verified_on": "2026-11-14",
    "latest_release": {
      "version": "2026-11-12T10:00:05",
      "date": "2026-11-12T10:00:05",
      "evidence": {
        "excerpt": "GET https://clinicaltrials.gov/api/v2/version returned: { \"apiVersion\" : \"2.0.5\", \"dataTimestamp\" : \"2026-11-12T10:00:05\" }",
        "snapshot_id": "s08",
        "url": "https://clinicaltrials.gov/api/v2/version"
      }
    },
    "files": [],
    "api": [
      {
        "name": "Version",
        "url_template": "https://clinicaltrials.gov/api/v2/version",
        "required_params": [],
        "example_request": "GET https://clinicaltrials.gov/api/v2/version",
        "key_response_fields": [
          "apiVersion",
          "dataTimestamp"
        ],
        "evidence": {
          "excerpt": "GET https://clinicaltrials.gov/api/v2/version returned: { \"apiVersion\" : \"2.0.5\", \"dataTimestamp\" : \"2026-11-12T10:00:05\" }",
          "snapshot_id": "s08",
          "url": "https://clinicaltrials.gov/api/v2/version"
        }
      },
      {
        "name": "Stats - size",
        "url_template": "https://clinicaltrials.gov/api/v2/stats/size",
        "required_params": [],
        "example_request": "GET https://clinicaltrials.gov/api/v2/stats/size",
        "key_response_fields": [
          "totalStudies",
          "averageSizeBytes"
        ],
        "evidence": {
          "excerpt": "GET https://clinicaltrials.gov/api/v2/stats/size returned (first part): {\"totalStudies\":611552,\"averageSizeBytes\":17327",
          "snapshot_id": "s08",
          "url": "https://clinicaltrials.gov/api/v2/version"
        }
      }
    ],
    "registration": null,
    "bulk_download": [],
    "gaps": [
      "no direct file address was found on the official pages we hold",
      "the official pages we hold publish no checksum for the files; none was computed (we do not download data files)"
    ],
    "license_note": {
      "license_status": "unstated",
      "text": "Use according to the terms of the official source; this recipe does not say the data can be used freely."
    }
  },
  "_links": {
    "text": "在本库继续查找。本条目是 109 条已处理并核实的记录之一（数据集、数据资源与开源模型）。查找其他条目：调用 `https://mcp.mdexa.com/v1/datasets?q=<关键词>`，或连接 MCP 服务 `https://mcp.mdexa.com/mcp`；每分钟 20 次以内无需密钥。每行返回不到 1 KB；空结果即\"数据库未收录\"。核对一份清单：一次批量核对（免费账号）即返回报告。说明：/agents.md。相似条目：医学考试题库 JSON 数据集 (https://mdexa.com/zh/datasets/medical-exam-question-bank-json/)；QASystemOnMedicalKG（医疗知识图谱） (https://mdexa.com/zh/datasets/qasystem-medical-kg/)；DrugCentral (https://mdexa.com/zh/datasets/drugcentral/)。",
    "records": 109,
    "search": {
      "template": "https://mcp.mdexa.com/v1/datasets?q={words}",
      "example": "https://mcp.mdexa.com/v1/datasets?q=%E7%BB%93%E5%90%88%E4%BA%B2%E5%92%8C%E5%8A%9B"
    },
    "mcp": "https://mcp.mdexa.com/mcp",
    "anonymous_calls_per_minute": 20,
    "guide": "https://mdexa.com/zh/agents.md",
    "faq": "https://mdexa.com/zh/developers/faq/",
    "similar": [
      {
        "name": "医学考试题库 JSON 数据集",
        "url": "https://mdexa.com/zh/datasets/medical-exam-question-bank-json/",
        "json": "https://mdexa.com/zh/datasets/medical-exam-question-bank-json.json"
      },
      {
        "name": "QASystemOnMedicalKG（医疗知识图谱）",
        "url": "https://mdexa.com/zh/datasets/qasystem-medical-kg/",
        "json": "https://mdexa.com/zh/datasets/qasystem-medical-kg.json"
      },
      {
        "name": "DrugCentral",
        "url": "https://mdexa.com/zh/datasets/drugcentral/",
        "json": "https://mdexa.com/zh/datasets/drugcentral.json"
      }
    ]
  }
}