# CTIS — EU Clinical Trials Information System ## Overview The Clinical Trials Information System (CTIS) is the EU's centralised portal for the authorisation, supervision, and transparency of clinical trials conducted under EU Clinical Trials Regulation 536/2014. Operated by the European Medicines Agency (EMA), CTIS replaced the previous EudraCT system and became the mandatory registration and submission platform for all new clinical trials in the EU and EEA from 31 January 2023. ## What CTIS Provides ### For Sponsors and Investigators - A single submission portal covering all EU/EEA member states simultaneously - Coordinated assessment involving the reference member state (RMS) and concerned member states (CMS) - Ethics committee (EC) review linked to the single application workflow - Lifecycle management: protocol amendments, substantial modifications, safety reporting - Results submission: end-of-trial notifications, clinical study reports (layperson summaries required) ### For the Public - A public transparency portal (https://euclinicaltrials.eu) providing searchable access to trial information including protocols, results, and layperson summaries - Results data published within 12 months of trial completion - Adverse event summaries and clinical study reports published for all trials ## Relationship to ClinicalTrials.gov CTIS and [[ClinicalTrials.gov]] serve the same conceptual role — public trial registry and results database — but are independent systems with different jurisdictions and data models. Academic trials at French and European sites typically register in both: CTIS (required under EU law) and [[ClinicalTrials.gov]] (required by ICMJE journals and increasingly by funders). The EMA (European Medicines Agency) has published a harmonisation roadmap aligning CTIS and ClinicalTrials.gov data models, though full interoperability is still in progress. ## Data Standards CTIS data is structured around the EU CTR protocol template, which is aligned with: - [[CDISC]] for protocol metadata (CDASH and SDTM conventions) - [[HL7 FHIR]] for programmatic data access (FHIR-based APIs in development) - [[MedDRA]] for adverse event coding in safety reports - [[ICD-10]] and [[ICD-11]] for condition coding in indication fields - [[MeSH]] for condition and intervention terminology ## Connections - Operated by: EMA (European Medicines Agency) - Complementary registry: [[ClinicalTrials.gov]] (US/ICMJE registry) - Controlled vocabularies: [[CDISC]], [[MedDRA]], [[ICD-10]], [[HL7 FHIR]] (API in development) ## Resources - https://euclinicaltrials.eu (CTIS public portal — trial search and results) - https://www.ema.europa.eu/en/human-regulatory-overview/research-and-development/clinical-trials-human-medicines/clinical-trials-regulation (EMA CTIS overview) - https://www.ema.europa.eu/en/human-regulatory-overview/research-and-development/clinical-trials-human-medicines/clinical-trials-information-system-ctis-training-support (EMA CTIS training) - https://www.clinicaltrialsregister.eu (EudraCT legacy — now redirects to CTIS)