National Institutes of Health ClinicalTrials.gov - lists >4400 studies at >50,000 sites
Cancer Portfolio.
This one lists all cancer research protocols in the U.S. & U.K., so you need to limit your search to the clinical trials.
AIDS Clinical Trials Information Service - (800) 874-2572
CenterWatch Clinical Trials Listing Service - also lists newly approved drugs, from Medical Economics Publ.
Trials Central - links to hundreds of registries, each listing multiple trials
www.nih.gov/icd - links to NIH member Institutes, some which list clinical trial info - (301) 496-5248
International Federation of Pharmaceutical Manufacturers and Associations Clinical Trials Portal
Some University Sites
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