# EU Clinical Trials Register / CTIS

Source: https://onco.cc/collections/eudract-ctis/  
OnCo record `eudract-ctis` (Collection). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

The EU Clinical Trials Register and CTIS are Europe's trial registry, complementing ClinicalTrials.gov for EU-only studies.

## Summary

The EU Clinical Trials Register and its successor CTIS hold European clinical trial registrations and results, and together they are Europe's trial registry, complementing ClinicalTrials.gov for studies that run only in the EU. The registry is operated by the European Medicines Agency and is public. On OnCo it is linked to the institution European Medicines Agency and is cited by the bottlenecks Trials enrol too few, too slowly, Failures are hidden and Regulatory divergence between regions. It also supports ideas such as Mutual recognition of ethics review across countries, One clinical trial application accepted by regulators in every major region, Actually fine sponsors who do not post trial results and A plain-language summary of every cancer trial result within a year.

## Fields

- Kind: Collection
- Last checked: 2026-09-04
- URL: https://euclinicaltrials.eu
- Holds: European clinical trial registrations and results.
- Licence: Public

## Sources

- EU Clinical Trials Register / CTIS: https://euclinicaltrials.eu

## Connected records

- bottlenecks: [Failures are hidden](https://onco.cc/bottlenecks/b-negative-results/), [Regulatory divergence between regions](https://onco.cc/bottlenecks/b-regulatory-fragmentation/), [Trials enrol too few, too slowly](https://onco.cc/bottlenecks/b-trial-enrolment/)
- ideas: [A plain-language summary of every cancer trial result within a year](https://onco.cc/ideas/idea-data-plain-language-summary-mandate/), [Actually fine sponsors who do not post trial results](https://onco.cc/ideas/idea-tr2-fdaaa-enforcement/), [Mutual recognition of ethics review across countries](https://onco.cc/ideas/idea-tr1-mutual-recognition-ethics-review/), [One clinical trial application accepted by regulators in every major region](https://onco.cc/ideas/idea-reg-global-trial-application-portal/), [One ethics approval and one consent form for a platform trial across countries](https://onco.cc/ideas/idea-tr2-platform-single-ethics/), [One national master contract and budget template for all cancer trials](https://onco.cc/ideas/idea-tr1-national-master-trial-agreement/), [Pay investigators for finishing and publishing trials, not for enrolling patients](https://onco.cc/ideas/idea-fund-trial-completion-bonus/), [Publish why patients were screened out of each trial](https://onco.cc/ideas/idea-tr1-public-screen-fail-reasons/)
- institutions: [European Medicines Agency](https://onco.cc/institutions/ema/)

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