Analyzing the Parkinson's disease clinical trial pipeline to facilitate patient collaboration in research.

Overview of

In December 2017, released a new version of its website featuring enhanced search and usability features, including the ability to search for trials by city/distance from city.  To learn more about these features, visit Further Enhancements to Functionality. NLM Tech Bull. 2017 Nov-Dec and More Changes to Improve Usability. NLM Tech Bull. 2017 Sep-Oct.

​​​ is an open access clinical study database launched in 2000 by the National Institutes of Health (NIH). Since tracks and analyzes Parkinson's disease clinical study data maintained in the database, this page provides an overview of for background.

Source: is a Web-based resource that provides patients, their family members, health care professionals, researchers, and the public with easy access to information on publicly and privately supported clinical studies on a wide range of diseases and conditions. The Web site is maintained by the National Library of Medicine (NLM) at the National Institutes of Health (NIH). Information on is provided and updated by the sponsor or principal investigator of the clinical study. Studies are generally submitted to the Web site (that is, registered) when they begin, and the information on the site is updated throughout the study. In some cases, results of the study are submitted after the study ends. This Web site and database of clinical studies is commonly referred to as a "registry" and "results database." contains information about medical studies in human volunteers. Most of the records on describe clinical trials (also called interventional studies). A clinical trial is a research study in which human volunteers are assigned to interventions (for example, a medical product, behavior, or procedure) based on a protocol (or plan) and are then evaluated for effects on biomedical or health outcomes. also contains records describing observational studies and programs providing access to investigational drugs outside of clinical trials (expanded access). does not contain all the clinical studies conducted in the United States because not all studies (for example, observational studies and trials that do not study a drug, biologic, or device) are required by law to be registered (see FDAAA 801 Requirements for more information). However, the rate of study registration has increased over time as more policies and laws requiring registration have been enacted and as more sponsors and investigators have voluntarily registered their studies. was made available to the public on February 29, 2000, and the results database was released in September 2008. Once a study is registered on the site it is not removed. The full history of changes made to a record can be accessed by viewing the archival version of the record on the archive.

​​​​​​​​​​​ History, Policies, and Laws

1997: Congress Passes Law (FDAMA) Requiring Trial Registration

2000: NIH Releases Web Site

2000–2004: FDA Issues Guidance for Industry Documents

2004: Wins the Innovations in American Government Award

2005: International Committee of Medical Journal Editors Requires Trial Registration

2006: World Health Organization Establishes Trial Registration Policy

2007: Congress Passes Law (FDAAA) Expanding Submission Requirements

2008: Releases Results Database

2008: Declaration of Helsinki Revision Promotes Trial Registration and Results Dissemination

2009: Public Meeting Held at the National Institutes of Health

2013: European Medicines Agency Expands

Clinical Trial Database to Include Summary Results

2014: Notice of Proposed Rulemaking (NPRM) for FDAAA 801 Issued for Public Comment

2014: NIH Draft Policy on Registration and Results Submission of NIH-Funded Clinical Trials Issued for Public Comment

2015: National Cancer Institute Issues Clinical Trial Access Policy

2016: Final NIH Policy on the Dissemination of NIH-Funded Clinical Trial Information Issued

(NIH News Release Sept. 2016 - HHS takes steps to provide more information about clinical trials to the public)