The WHO International Clinical Trials Registry Platform is " a voluntary platform to link clinical trials registers in order to ensure a single point of access and the unambiguous identification of trials with a view to enhancing access to information by patients, families, patient groups and others". The platform has a searchable portal:International Clinical Trials Registry Platform (ICTRP) search portal
ClinicalTrials.gov is a registry and results database of privately and publicly funded clinical studies conducted around the world. The resource is provided by the U.S. National Library of Medicine. Each study record includes a summary of the study protocol. Some study records include a summary of the results in a tabular format. Studies can be searched by status, condition or disease, country, or by other terms. The database is continually updated; it currently lists over 300,000 research studies located in all 50 states in the United States of America and over 200 other countries around the world.
The ISRCTN registry is a primary clinical trial registry. It is recognized by WHO and (International Committee of Medical Journal Editors) ICMJE and accepts all clinical research studies (whether proposed, ongoing or completed). Each study record includes a plain English summary as well as details of the study protocol. All study records can be searched using an advanced search function. Currently, the registry lists over 18,000 studies.
The EU Clinical Trials Register contains information on interventional clinical trials on medicines conducted in the European Union (EU), or the European Economic Area (EEA) which started after 1 May 2004. It also includes some clinical trials conducted outside the EU/EEA or some older trials that meet certain criteria. Study records indicate the trial protocol and provide results where available. Records can be searched using an advanced search function. Currently, the registry displays over 34,000 clinical trials.
The PACTR is a regional register of clinical trials conducted in Africa. An open-access platform where clinical trials can be registered free of charge, providing an electronic database of planned trials and trials currently in progress.
