Clinical trials
Withdrawn Phase 1 trials
Search ClinicalTrials.gov registrations by keyword, then narrow by condition, phase, status, country and start year.
1,837 trials match Source: ClinicalTrials.gov registrations
Trials started per year
By phase, 2000 to 2026.
| Category | Trials |
|---|---|
| 2000 | 4 |
| 2001 | 3 |
| 2002 | 3 |
| 2003 | 3 |
| 2004 | 6 |
| 2005 | 15 |
| 2006 | 25 |
| 2007 | 39 |
| 2008 | 47 |
| 2009 | 66 |
| 2010 | 56 |
| 2011 | 70 |
| 2012 | 57 |
| 2013 | 59 |
| 2014 | 79 |
| 2015 | 80 |
| 2016 | 91 |
| 2017 | 91 |
| 2018 | 103 |
| 2019 | 89 |
| 2020 | 118 |
| 2021 | 133 |
| 2022 | 125 |
| 2023 | 126 |
| 2024 | 114 |
| 2025 | 96 |
| 2026 | 57 |
Status
Trials by registry status. Select a bar to filter.
| Category | Trials |
|---|---|
| Withdrawn | 1,837 |
Top lead sponsors
A sponsor with a page on Pharma Observatory links to it.
| Category | Trials |
|---|---|
| M.D. Anderson Cancer Center | 54 |
| GlaxoSmithKline | 37 |
| National Institute of Allergy and Infectious Diseases (NIAID) | 33 |
| Pfizer | 31 |
| Mayo Clinic | 28 |
| National Cancer Institute (NCI) | 25 |
| Washington University School of Medicine | 22 |
| Bristol-Myers Squibb | 21 |
| Johns Hopkins University | 21 |
| University of Alabama at Birmingham | 21 |
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 | 69 |
| Neoplasms | 69 |
| Carcinoma, Non-Small-Cell Lung | 47 |
| Leukemia, Myeloid, Acute | 44 |
| Pancreatic Neoplasms | 42 |
| Lymphoma | 39 |
| Recurrence | 36 |
| COVID-19 | 33 |
| Leukemia | 31 |
| Leukemia, Lymphocytic, Chronic, B-Cell | 31 |
Trials
Showing 1 to 25 of 1,837. Each trial links to its page on Pharma Observatory.
1,737 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.