Clinical trials
Observational trials in the United States with unknown status
Search ClinicalTrials.gov registrations by keyword, then narrow by condition, phase, status, country and start year.
2,109 trials match Source: ClinicalTrials.gov registrations
Trials started per year
By phase, 2000 to 2026.
| Category | Trials |
|---|---|
| 2000 | 3 |
| 2001 | 7 |
| 2002 | 10 |
| 2003 | 17 |
| 2004 | 18 |
| 2005 | 32 |
| 2006 | 45 |
| 2007 | 44 |
| 2008 | 58 |
| 2009 | 78 |
| 2010 | 54 |
| 2011 | 86 |
| 2012 | 95 |
| 2013 | 96 |
| 2014 | 102 |
| 2015 | 88 |
| 2016 | 107 |
| 2017 | 135 |
| 2018 | 118 |
| 2019 | 149 |
| 2020 | 200 |
| 2021 | 187 |
| 2022 | 145 |
| 2023 | 126 |
| 2024 | 54 |
Status
Trials by registry status. Select a bar to filter.
| Category | Trials |
|---|---|
| Unknown status | 2,109 |
Top lead sponsors
A sponsor with a page on Pharma Observatory links to it.
| Category | Trials |
|---|---|
| M.D. Anderson Cancer Center | 63 |
| Massachusetts General Hospital | 48 |
| University of Virginia | 31 |
| National Center for Research Resources (NCRR) | 29 |
| University of Colorado, Denver | 28 |
| Brigham and Women's Hospital | 27 |
| Methodist Health System | 25 |
| University of Washington | 24 |
| University of California, San Diego | 23 |
| Cedars-Sinai Medical Center | 20 |
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 | 58 |
| Neoplasms | 55 |
| COVID-19 | 54 |
| Parkinson Disease | 38 |
| Obesity | 37 |
| Diabetes Mellitus | 36 |
| Alzheimer Disease | 34 |
| Heart Failure | 34 |
| Stroke | 31 |
| Prostatic Neoplasms | 27 |
Trials
Showing 1 to 25 of 2,109. Each trial links to its page on Pharma Observatory.
2,009 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.
No changes to these trials in the last 7 days.
Go deeper on Pharma Observatory
Pharma Observatory connects clinical trials, sponsors, sites and investigators in one searchable platform.