Clinical trials
Observational trials in the United States
Search ClinicalTrials.gov registrations by keyword, then narrow by condition, phase, status, country and start year.
31,628 trials match Source: ClinicalTrials.gov registrations
Trials started per year
By phase, 2000 to 2026.
| Category | Trials |
|---|---|
| 2000 | 205 |
| 2001 | 274 |
| 2002 | 312 |
| 2003 | 458 |
| 2004 | 564 |
| 2005 | 742 |
| 2006 | 912 |
| 2007 | 1,058 |
| 2008 | 1,184 |
| 2009 | 1,206 |
| 2010 | 1,276 |
| 2011 | 1,285 |
| 2012 | 1,316 |
| 2013 | 1,292 |
| 2014 | 1,380 |
| 2015 | 1,307 |
| 2016 | 1,322 |
| 2017 | 1,502 |
| 2018 | 1,408 |
| 2019 | 1,529 |
| 2020 | 1,743 |
| 2021 | 1,794 |
| 2022 | 1,482 |
| 2023 | 1,475 |
| 2024 | 1,325 |
| 2025 | 1,217 |
| 2026 | 982 |
Status
Trials by registry status. Select a bar to filter.
| Category | Trials |
|---|---|
| Completed | 18,840 |
| Recruiting | 4,283 |
| Terminated | 2,464 |
| Unknown status | 2,109 |
| Active, not recruiting | 1,631 |
| Withdrawn | 1,142 |
| Enrolling by invitation | 645 |
| Not yet recruiting | 393 |
| Suspended | 121 |
Top lead sponsors
A sponsor with a page on Pharma Observatory links to it.
| Category | Trials |
|---|---|
| Mayo Clinic | 756 |
| M.D. Anderson Cancer Center | 493 |
| Memorial Sloan Kettering Cancer Center | 432 |
| National Institute of Allergy and Infectious Diseases (NIAID) | 410 |
| National Cancer Institute (NCI) | 407 |
| Duke University | 390 |
| Stanford University | 386 |
| National Institute of Neurological Disorders and Stroke (NINDS) | 379 |
| Massachusetts General Hospital | 364 |
| University of California, San Francisco | 344 |
Top conditions
MeSH conditions the trials were registered with, not their broader categories. A condition with a page on Pharma Observatory links to it.
| Category | Trials |
|---|---|
| Breast Neoplasms | 1,006 |
| Neoplasms | 897 |
| Obesity | 651 |
| Heart Failure | 512 |
| Diabetes Mellitus | 505 |
| COVID-19 | 504 |
| Prostatic Neoplasms | 461 |
| Lung Neoplasms | 437 |
| Cardiovascular Diseases | 380 |
| Parkinson Disease | 375 |
Trials
Showing 1 to 25 of 31,628. Each trial links to its page on Pharma Observatory.
31,528 more trials match. See them on Pharma Observatory
Recently changed trials
Changes observed in the last 7 days, newest first, site-count changes left out. Source: ClinicalTrials.gov.
Go deeper on Pharma Observatory
Pharma Observatory connects clinical trials, sponsors, sites and investigators in one searchable platform.