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Datasets:
anamnesis-data
/
clinical_trials_history

Tasks:
Tabular Classification
Tabular Regression
Time Series Forecasting
Modalities:
Tabular
Text
Formats:
parquet
Languages:
English
Size:
100M - 1B
Tags:
clinical-trials
clinical-trial-data
clinical-research
clinical-data
medical
medical-data
Libraries:
Datasets
Dask
Polars
License:
Dataset card Data Studio Files
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This repository is publicly accessible, but you have to accept the conditions to access its files and content.

This dataset is a compilation of ClinicalTrials.gov data (a U.S. Government
database) by the dataset author. The compilation is licensed under
CC-BY-NC-4.0. As a condition of accessing these files, you agree to:

  1. Cite this dataset, and attribute the underlying data to ClinicalTrials.gov,
    in any publication or derivative work.
  2. Not use these files, or copies of them, for commercial purposes without a
    separate commercial license from the author. Examples: ML training data
    for commercial models, redistribution in a commercial product or service,
    inclusion in databases offered for sale, or quantitative trading /
    commercial market analysis.

These terms apply to this dataset only, not to data you obtain directly from
ClinicalTrials.gov. For commercial licensing, contact licensing@anamnesisdata.com
or visit https://anamnesisdata.com.

Log in or Sign Up to review the conditions and access this dataset content.

Clinical Trials Version History

The Clinical Trials Version History dataset by Anamnesis Data: structured medical and scientific data for biotech, pharma and healthcare research. Public trial registries show only a trial's latest state. This dataset keeps every version, so you can see what a trial said on any past date, or when a sponsor moved a completion date.

604,582 trials (4,444,543 versions), one folder of Parquet files per table (79 tables, 526,178,527 rows). Access is gated; request it above. A free sample of 20 complete trials has the same tables and columns.

Example queries

sample_queries.sql in the sample holds ready-to-run DuckDB queries, from a trial's current record to serious adverse event rates. They run unchanged against this dataset's setup.sql, which creates one view per table; on the full data, add a LIMIT to the row-level ones.

Quick start

Download the repository, then in DuckDB, from that folder:

.read setup.sql          -- one view per table, named after its folder

-- the current record of every trial
SELECT nct_id, nct_version, overall_status, lead_sponsor_name
FROM core
QUALIFY row_number() OVER (PARTITION BY nct_id ORDER BY nct_version DESC) = 1;

Or read a table in place with a token from an account that has been granted access:

CREATE SECRET hf_token (TYPE huggingface, PROVIDER credential_chain);  -- uses `hf auth login`
SELECT * FROM 'hf://datasets/anamnesis-data/clinical_trials_history/core/*.parquet' LIMIT 5;

from datasets import load_dataset
core = load_dataset("anamnesis-data/clinical_trials_history", "core", split="train")

What's inside

Each folder is one table. core has one row per trial version; interventions, conditions, phases, arm_groups, locations and the results_* tables (participant flow, baseline, outcomes, adverse events) hang off it. Tables with nct_version join to core on (nct_id, nct_version); per-trial tables join on nct_id.

Things to know:

  • Versions. nct_version is the source's own 0-based version number for a trial.
  • No "current" flag. The current record is a trial's highest nct_version, as in the query above. It is the latest version held here, which can trail the live record.
  • Obsolete IDs. Every table ends with is_obsolete and obsolete_by, which flag registrations since merged into another (19 trials). Filter on NOT is_obsolete to drop them.
  • Repeated entries. In lists keyed by name (for example interventions, arm_groups, secondary_ids and overall_officials), an entry that repeats another's name within one version is kept once, and entries missing that name are left out.
  • Raw text. Text is as collected, uncleaned. Many fields contain HTML-escaped characters such as & or '.

Releases

Each release is tagged vYYYY.MM.DD; pass it as revision= (or @vYYYY.MM.DD in an hf:// path) to pin one. A tag moves if the same day is republished; pin a commit hash for a fixed snapshot. This release's newest change: 2026-09-25.

Repository move

Releases up to v2026.09.26 were published at brbk/clinical_trials_history; new releases are published here only. Access approvals do not carry over, so request access again here.

Source and license

Trial records come from ClinicalTrials.gov, a U.S. Government database operated by the National Library of Medicine at NIH; no proprietary rights are claimed in them, and the site's terms apply to them. We restructured the records into tables and a subset of fields; dates given only as a month or year are set to its first day (a *_precision column, where present, keeps the original). Other values are as returned.

The compilation (structure, schema, version history and documentation) is licensed CC BY-NC 4.0. Access is gated: you agree to cite this dataset and attribute the data to ClinicalTrials.gov, and not to use these files commercially without a separate license. These terms do not apply to data you obtain directly from ClinicalTrials.gov. For commercial licensing, contact licensing@anamnesisdata.com or visit anamnesisdata.com.

Citation 

@misc{clinical_trials_history_2026,
  title  = {Clinical Trials Version History},
  author = {{Anamnesis Data}},
  year   = {2026},
  url    = {https://huggingface.co/datasets/anamnesis-data/clinical_trials_history}
}
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