Browse clinical trials

Find your way into all 175,638 registered US clinical trials, alphabetically by condition, or straight to the most-studied conditions, most-active sponsors, and busiest states.

Download the state trial statistics CSV cited on this page: clinicaltrials-gov-us-state-statistics.csv (ClinicalTrials.gov · CC0).

According to ClinicalTrials.gov, the public registry maintained by the U.S. National Library of Medicine, PlainTrial mirrors 175,638 US clinical trials spanning 28,708 distinct conditions and 15,742 sponsors, of which 24,857 are currently recruiting participants. This page is the front door to all of it: browse conditions alphabetically, jump to the most-studied conditions and most-active sponsors, or start from a US state. Every entity page is built live from the registry and links back to the original ClinicalTrials.gov record. See our methodology for how this data is sourced and refreshed.

Conditions A–Z

PlainTrial tracks 28,708 distinct conditions. Jump to any letter to see every condition starting with it and the trials studying each.

Most-studied conditions

Browse all conditions →
Breast Cancer 1,251 trials · 423 recruiting Healthy 1,096 trials · 225 recruiting Obesity 1,057 trials · 306 recruiting Prostate Cancer 749 trials · 275 recruiting Depression 687 trials · 245 recruiting Cancer 621 trials · 279 recruiting HIV Infections 615 trials · 56 recruiting Hypertension 472 trials · 152 recruiting Stroke 456 trials · 218 recruiting Non-Small Cell Lung Cancer 455 trials · 206 recruiting Multiple Myeloma 441 trials · 167 recruiting Lung Cancer 430 trials · 146 recruiting Heart Failure 399 trials · 164 recruiting Colorectal Cancer 394 trials · 162 recruiting Asthma 378 trials · 70 recruiting Pain 377 trials · 106 recruiting

† Condition counts include only the 60,823 of 175,638 indexed trials (35%) that have a condition list: 92% of recruiting and active trials but 24% of completed ones, so completed and closed studies are under-counted. How the counts are built

Most-active sponsors

Browse all sponsors →
National Cancer Institute (NCI) 3,257 trials Mayo Clinic 2,844 trials M.D. Anderson Cancer Center 2,692 trials Massachusetts General Hospital 2,032 trials National Institute of Allergy and Infectious Diseases (NIAID) 2,006 trials Memorial Sloan Kettering Cancer Center 1,884 trials Pfizer 1,845 trials Stanford University 1,744 trials Duke University 1,725 trials University of California, San Francisco 1,713 trials VA Office of Research and Development 1,668 trials Washington University School of Medicine 1,502 trials

Trials by US state

Trials by US state →
California 16,646 trials Florida 10,986 trials New York 10,554 trials Texas 9,951 trials Massachusetts 7,667 trials Pennsylvania 6,946 trials Illinois 6,854 trials Ohio 6,514 trials Maryland 6,441 trials North Carolina 5,625 trials Arizona 5,607 trials Colorado 5,273 trials

† State counts include only the 60,823 of 175,638 indexed trials (35%) that have a listed U.S. site: 92% of recruiting and active trials but 24% of completed ones, so completed and closed studies are under-counted. How the counts are built

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