Clinical trials
Terminated Observational trials in the United States
Search ClinicalTrials.gov registrations by keyword, then narrow by condition, phase, status, country and start year.
2,464 trials match Source: ClinicalTrials.gov registrations
Trials started per year
By phase, 2000 to 2026.
| Category | Trials |
|---|---|
| 2000 | 7 |
| 2001 | 13 |
| 2002 | 27 |
| 2003 | 28 |
| 2004 | 48 |
| 2005 | 70 |
| 2006 | 86 |
| 2007 | 110 |
| 2008 | 104 |
| 2009 | 113 |
| 2010 | 132 |
| 2011 | 135 |
| 2012 | 119 |
| 2013 | 117 |
| 2014 | 134 |
| 2015 | 121 |
| 2016 | 129 |
| 2017 | 131 |
| 2018 | 125 |
| 2019 | 144 |
| 2020 | 126 |
| 2021 | 136 |
| 2022 | 94 |
| 2023 | 80 |
| 2024 | 52 |
| 2025 | 16 |
| 2026 | 4 |
Status
Trials by registry status. Select a bar to filter.
| Category | Trials |
|---|---|
| Terminated | 2,464 |
Top lead sponsors
A sponsor with a page on Pharma Observatory links to it.
| Category | Trials |
|---|---|
| Mayo Clinic | 51 |
| Stanford University | 50 |
| Children's Healthcare of Atlanta | 48 |
| National Institute of Allergy and Infectious Diseases (NIAID) | 34 |
| M.D. Anderson Cancer Center | 32 |
| Wake Forest University Health Sciences | 31 |
| Johns Hopkins University | 28 |
| University of California, San Francisco | 28 |
| Emory University | 27 |
| National Institute of Neurological Disorders and Stroke (NINDS) | 27 |
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 | 89 |
| Neoplasms | 88 |
| Prostatic Neoplasms | 53 |
| Heart Failure | 48 |
| Lung Neoplasms | 48 |
| Obesity | 43 |
| Carcinoma, Non-Small-Cell Lung | 37 |
| Congenital, Hereditary, and Neonatal Diseases and Abnormalities | 37 |
| Osteoarthritis | 35 |
| COVID-19 | 30 |
Trials
Showing 1 to 25 of 2,464. Each trial links to its page on Pharma Observatory.
2,364 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.