Medical Information Only. Consult your healthcare provider before enrolling in any clinical trial.
Oklahoma: below-average open trial sites
364 of 1,061 in-state trials are recruiting (34%); below the 37% national average by 3 percentage points.
According to ClinicalTrials.gov-derived indexes, Oklahoma sits in the lower half of US states by in-state trial count (#35 of 52 states by registered in-state trial count).
Oklahoma: 1,061 US clinical trials with in-state sites, 364 recruiting.
Oklahoma has 1,061 registered US clinical trials with a study site in-state, 364 of them currently recruiting (below the 37% national average by 3 percentage points). 191 of these trials are in Phase 3 (late-stage) and 261 in Phase 2. The most frequently studied condition in Oklahoma is Ovarian Cancer, with 33 linked trials.
Lower-half Oklahoma archive
Oklahoma's in-state trials target 539 patients on average (p4 by trial size among 52 states with enrollment data), smaller studies than most states. Treat this page as a compact local index (mid-volume · high-open), then jump to recruiting trials or methodology rather than expecting hub-scale coverage.
Below-average open enrollment
Oklahoma still shows 364 recruiting of 1,061 in-state trials (34% open), but below the 37% national average by 3 percentage points, so archived statuses weigh heavier than the national baseline.
- 34%
- open (below national share)
- 364
- still recruiting despite cool share
- 261
- Phase 2 rows in this footprint
- 33
- top: Ovarian Cancer
Recruiting share is below the 37% national average by 3 percentage points. Counts include every study with at least one recorded site in the state. Registry reference only, not medical advice.
Oklahoma vs all states by indexed in-state trial count
Where this state's ClinicalTrials.gov site count sits among every state with at least one listed trial (coverage density, not care quality)
1,061 Top 67% more indexed trials than 33% of 52 states
States, banded by indexed in-state trial count
Each bar is a band; taller bars hold more states. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source ClinicalTrials.gov · 2026-08-08
Key findings
What ClinicalTrials.gov does not surface for Oklahoma on its own pages , computed from the registry mirror as of 2026-08-08. Each line carries its own denominator so it can be quoted as it stands.
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Oklahoma open-enrollment share sits below the national baseline.
364 of 1,061 in-state trials (34.3%) are recruiting, against 37% nationally (-2.7 percentage points). Counts include every study with at least one recorded site in the state.
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Oklahoma City dominates Oklahoma's trial geography.
Oklahoma City lists 776 of 1,061 in-state trials (73.1%) across 334 named facilities. Cities need five or more listed trials to appear here; locations are as filed by sponsors.
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Ovarian Cancer is the most-studied condition in Oklahoma.
33 of 1,061 in-state trials (3.1%) list Ovarian Cancer. That is a local concentration figure, not a national disease ranking.
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One sponsor accounts for a large share of Oklahoma trials.
University of Oklahoma appears on 136 of 1,061 in-state trials (12.8%). Sponsor identity is as filed on ClinicalTrials.gov.
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484 Oklahoma trials carry a completed status.
484 of 1,061 (45.6%) are completed. The open share above is the remainder that still lists recruiting.
By Status
| Status | Trial count |
|---|---|
| Completed | 484 |
| Recruiting | 364 |
| Active | 213 |
By Phase
| Phase | Trial count |
|---|---|
| Phase 2 | 261 |
| NA | 231 |
| Phase 1 | 208 |
| Phase 3 | 191 |
| Phase 4 | 59 |
| Early Phase 1 | 7 |
Top Conditions
Top Sponsors
Where trials run in Oklahoma
Oklahoma City carries 776 of Oklahoma's 1,061 indexed trials (73%) across 334 named sites, ahead of Tulsa at 214. 6 cities clear five listed trials, together naming 522 distinct sites.
| City | Trials | Listed sites |
|---|---|---|
| Oklahoma City | 776 | 334 |
| Tulsa | 214 | 139 |
| Norman | 36 | 20 |
| Edmond | 29 | 20 |
| Stillwater | 10 | 4 |
| Bartlesville | 8 | 5 |
Distinct trials and named sites per city, as filed with ClinicalTrials.gov; cities under five trials omitted. Vintage 2026-08-08.
Trial size small
Oklahoma's in-state trials target 539 patients on average (p4 by trial size among 52 states with enrollment data), smaller studies than most states.
Oklahoma: in-state trial volume sits mid-pack
Geography is concentrated: Oklahoma City alone accounts for 73% of Oklahoma's indexed trials (776 of 1,061), with Tulsa a distant second at 214.
Phase mix: 191 Phase 3 vs 261 Phase 2 (balanced across stages).
Top condition: Ovarian Cancer (33 trials); top sponsor University of Oklahoma (136).
mid-volume · high-open figures (1,061 trials · 34% open) describe registry geography under the trial size small read, not clinic capacity or protocol fit. Confirm status on ClinicalTrials.gov before acting.
States near Oklahoma on in-state trial volume
Cross-state peers under the trial size small read (mid-volume · high-open), not the same-state browse list.
Similar mid-volume peers (± open share)
- Nevada · 900 trials · 27% recruiting
- Nebraska · 1,301 trials · 29% recruiting
- Delaware · 652 trials · 33% recruiting
- Idaho · 633 trials · 26% recruiting
- New Mexico · 579 trials · 29% recruiting
Similar high-open peers (± trial volume)
- Rhode Island · 34% recruiting · 753 trials
- Michigan · 34% recruiting · 4,790 trials
- Pennsylvania · 34% recruiting · 6,946 trials
- South Carolina · 35% recruiting · 1,706 trials
- Oregon · 34% recruiting · 1,999 trials