About and data trust
About Clinical Trial Failures
Clinical Trial Failures is a research tool for studying stopped clinical trials. It helps users search terminated, suspended, and withdrawn records and compare likely stop-reason signals such as efficacy, futility, safety, operational, enrollment, funding, regulatory, and other/unknown reasons.
Primary source
The underlying records are derived from ClinicalTrials.gov registry data. Trial status, sponsor, phase, condition, intervention, update dates, and stop-reason text should be verified against the original ClinicalTrials.gov record before being used in medical, scientific, commercial, or investment decisions.
Methodology
The site groups sponsor-provided stop language into practical research buckets. These labels are screening signals, not final judgments. A stopped trial can have multiple causes, and registry text can be incomplete or change over time.
The detailed methodology is available on the Methods page.
Important limitation
This website is for research support only. It does not provide medical advice, clinical recommendations, investment advice, or a substitute for reviewing primary source documents.
Contact and corrections
If a record appears incomplete or misclassified, verify the source ClinicalTrials.gov page first and use the methods page as the reference for how classifications are assigned. Corrections should be based on primary registry text or source documents.