Clinical trials
Withdrawn Phase 1 trials in the United States
Search ClinicalTrials.gov registrations by keyword, then narrow by condition, phase, status, country and start year.
780 trials match Source: ClinicalTrials.gov registrations
Trials started per year
By phase, 2000 to 2026.
| Category | Trials |
|---|---|
| 2000 | 1 |
| 2001 | 2 |
| 2002 | 1 |
| 2003 | 1 |
| 2004 | 4 |
| 2005 | 8 |
| 2006 | 14 |
| 2007 | 15 |
| 2008 | 21 |
| 2009 | 24 |
| 2010 | 21 |
| 2011 | 30 |
| 2012 | 21 |
| 2013 | 29 |
| 2014 | 37 |
| 2015 | 32 |
| 2016 | 43 |
| 2017 | 38 |
| 2018 | 45 |
| 2019 | 40 |
| 2020 | 53 |
| 2021 | 59 |
| 2022 | 43 |
| 2023 | 54 |
| 2024 | 54 |
| 2025 | 40 |
| 2026 | 20 |
Status
Trials by registry status. Select a bar to filter.
| Category | Trials |
|---|---|
| Withdrawn | 780 |
Top lead sponsors
A sponsor with a page on Pharma Observatory links to it.
| Category | Trials |
|---|---|
| National Institute of Allergy and Infectious Diseases (NIAID) | 17 |
| Johns Hopkins University | 15 |
| Mayo Clinic | 15 |
| National Cancer Institute (NCI) | 15 |
| NYU Langone Health | 12 |
| Bristol-Myers Squibb | 11 |
| M.D. Anderson Cancer Center | 11 |
| Stanford University | 11 |
| Roswell Park Cancer Institute | 10 |
| Baylor College of Medicine | 9 |
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 |
|---|---|
| Neoplasms | 37 |
| Breast Neoplasms | 29 |
| Pancreatic Neoplasms | 23 |
| Lymphoma | 16 |
| Prostatic Neoplasms | 16 |
| Lymphoma, Non-Hodgkin | 15 |
| Multiple Myeloma | 15 |
| Neoplasm Metastasis | 15 |
| Leukemia, Myeloid, Acute | 14 |
| Precursor Cell Lymphoblastic Leukemia-Lymphoma | 14 |
Trials
Showing 1 to 25 of 780. Each trial links to its page on Pharma Observatory.
680 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.