Clinical trial summaries, other trial-related resources, and the trials database from the American College of Cardiology.

CENTRAL is a database of records of controlled trials identified from MEDLINE, EMBASE, other databases, through handsearching journals and from drug companies. The database is prepared by the Cochrane Collaboration and is part of The Cochrane Library, a collection of databases available (by national or personal subscription) online or as a CD-ROM.

Based in the UK, Current Controlled Trials (CCT) allows users to search, register and share information about randomised controlled trials conducted worldwide in all areas of healthcare. Access to all information is free. It includes the metaRegister of Controlled Trials (mRCT), which is comprised of 12 trial registries, including ClinicalTrials.gov. Listings to completed studies are retained but there are no links to results. Search by keyword via a single search box.

The Eli Lilly and Company clinical trial registry contains information about clinical trials sponsored by Eli Lilly. Select from a list of trials by therapeutic area or product. Alternatively, access information from a list of initiated and ongoing clinical trials, identified by their unique numerical code.

Guide from the Center for Reviews and Dissemination.

The Forest Laboraties Clinical Trial Registry contains information about clinical studies conducted by Forest Laboratories. Select from a list of ongoing or completed trials.

The GSK Clinical Trial Register provides access to information on GSK-sponsored clinical trials. Information includes: 1. Study title/rationale/objectives/phase; 2. Study design/treatment schedule/location(s); 3. Statistical methods; 4. Study period; 5. Study population/demographics; 6. Results for primary and secondary endpoints defined in the trial protocol; 7. Adverse events; and 8. References to published information on the trial, or, when not available, a conclusion is added. Select from a list of generic names to access the register.

The International Federation of Pharmaceutical Manufacturers and Associations’ (IFPMA) clinical trials portal provides access to on-going clinical trials and to results of completed trials. The resource covers individual pharmaceutical company sites, sites run by third parties working on behalf of these companies, pharmaceutical industry association resources, and government sites which routinely carry details of industry trials. 

The National Cancer Institute of Canada clinical trials site lists Canadian and international clinical trials in cancer therapy and supportive care. The resource is mainly members-only access but the public can view a descriptive listing of current trials. Select from a list of disease sites.

The National Research Register (NRR) is an archives of information on research funded by or of interest to the UK National Health Service, including unpublished trials. 

Search the Studies is a register of studies conducted at the US National Institutes of Health Clinical Center. Search by single or multiple keyword(s) or browse by institute of principal investigator.

The Ontario cancer trials is a register of cancer trials in Ontario, Canada, sponsored by the Ontario Institute for Cancer Research. Search by keyword or type of cancer, location, or type of trial. Search results can be saved.

The PhRMA Clinical Study Results Database database lists phase III and IV studies completed since October 1, 2002 by 25 participating US pharmaceutical companies. Contents include bibliography of and links (where available) to published articles reporting clinical study results, as well as summaries of the results of clinical studies that have not been published. Search using pull-down lists of company name, generic or trade name, indication or study name.

The Physician Data Query (PDQ) clinical trials database is maintained by the US National Cancer Institute. It contains a list of more than 2,000 cancer clinical trials worldwide. Search by type or stage of cancer, location or trial type. Use the advanced search interface for additional options, including trial status, phase, drug and treatment type, Drop-down boxes and browse lists help guide searching.

PsiTri lists information about published and unpublished controlled clinical trials in the field of mental health. It provides access to the specialised trial registers of Cochrane Review Groups (CRG) related to mental health. There are multiple, sophisticated search options. Search using a basic or advanced search interface, or browse content by PsiTri-assigned index terms. You can also browse topics by CRG or by the groups’ main subject topics. Search results can be refined with additional search terms.

Trials Central is a free, easy-to-use database of clinical trials registers. Use the drop-down box and radio buttons to search site descriptions by health condition (e.g., substance abuse) and major health topic, as well as by trial location (i.e., US state). It also provides a listing of all the registers in the TrialsCentral database by type (e.g., government, pharmaceutical companies).

The University of Alberta clinical trial site provides links to approximately 20 clinical trial registers. Search registers according to the search features available for each site.