German Clinical Trials Register: DRKS
This resource has its own search interface, but is also searchable under the ICTRP search portal.
The register contains over 14,000 studies (April 2023).
The English language introduction leads into a German and English search interface.
Search options
Search options
Default operator AND
Boolean operators AND, OR. Words can be excluded by prefixing with a minus sign (e.g. -cancer)
Phrase searching The help pages say that this does not work yet (13 April 2023)
Nesting Unclear
Truncation * (can be applied at the beginning or end of a word)
Field tags Fielded searching is available via the Extended Search.
Hyphens Hyphens are treated as a space
Help pages Yes
Example breast AND cancer
Saved searches No
Export tagged No
Updated 13 April 2023