ClinicalTrials.Gov

The ClinicalTrials.gov website provides a searchable interface to records of ongoing clinical trials and the results of completed trials. The database can also be searched via the ICTRP.

The modernized version of the interface to ClinicalTrials.gov was made available in 2023. The classic interface will be retired in 2024. There is a data migration plan for moving content from the classic interface to the new interface.

The register has more than 490,000 studies (14 April 2024) conducted in 223 countries.

Detailed Help pages are available.

Search options (classic website)

Default operator AND, terms are also mapped to other search terms

Boolean operators AND, OR, NOT

Phrase searching "breast cancer"

Nesting Yes, for example within the Condition search box it is possible

to search using nested terms:

(colon OR breast) AND (cancer OR neoplasms)

Truncation Not available

Field tags A range of filtering options are available

Hyphens Hyphens are ignored

Help pages Yes

Example (colon OR breast) AND (cancer OR neoplasms)

Saved searches RSS feeds can be set up to provide updates

Export tagged PDF, Plain text, Tab-separated values, Comma-separated values (CSV) or XML

Updated 16 April 2024