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| Withdrawn | 1,142 |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 26 to 50 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.