Medical Information Only. Consult your healthcare provider before enrolling in any clinical trial.
Arizona: below-average open trial sites
1,688 of 5,607 in-state trials are recruiting (30%); below the 37% national average by 7 percentage points.
According to ClinicalTrials.gov-derived indexes, Arizona sits in the upper quartile of US states by in-state trial count (#11 of 52 states by registered in-state trial count).
Arizona: 5,607 US clinical trials with in-state sites, 1,688 recruiting.
Arizona has 5,607 registered US clinical trials with a study site in-state, 1,688 of them currently recruiting (below the 37% national average by 7 percentage points). 1,954 of these trials are in Phase 3 (late-stage) and 1,449 in Phase 2. The most frequently studied condition in Arizona is Breast Cancer, with 111 linked trials.
Upper-quartile research density
Arizona sits in the upper quartile by in-state trial count. Open share is below the 37% national average by 7 percentage points - denser than most states, still short of the top-decile research hubs.
Below-average open enrollment
Arizona still shows 1,688 recruiting of 5,607 in-state trials (30% open), but below the 37% national average by 7 percentage points, so archived statuses weigh heavier than the national baseline.
- 30%
- open (below national share)
- 1,688
- still recruiting despite cool share
- 1,449
- Phase 2 rows in this footprint
- 111
- top: Breast Cancer
Recruiting share is below the 37% national average by 7 percentage points. Counts include every study with at least one recorded site in the state. Registry reference only, not medical advice.
Arizona 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)
5,607 Top 21% more indexed trials than 79% 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 Arizona 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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Arizona open-enrollment share sits below the national baseline.
1,688 of 5,607 in-state trials (30.1%) are recruiting, against 37% nationally (-6.9 percentage points). Counts include every study with at least one recorded site in the state.
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Arizona trial sites spread across 8 city hubs.
Phoenix lists 2,754 of 5,607 in-state trials (49.1%) across 1,101 named facilities. Cities need five or more listed trials to appear here; locations are as filed by sponsors.
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Breast Cancer is the most-studied condition in Arizona.
111 of 5,607 in-state trials (2%) list Breast Cancer. That is a local concentration figure, not a national disease ranking.
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Arizona sponsorship is fragmented across many organizations.
National Cancer Institute (NCI) appears on 231 of 5,607 in-state trials (4.1%). Sponsor identity is as filed on ClinicalTrials.gov.
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2,482 Arizona trials carry a completed status.
2,482 of 5,607 (44.3%) are completed. The open share above is the remainder that still lists recruiting.
By Status
| Status | Trial count |
|---|---|
| Completed | 2,482 |
| Recruiting | 1,688 |
| Active | 1,437 |
By Phase
| Phase | Trial count |
|---|---|
| Phase 3 | 1,954 |
| Phase 2 | 1,449 |
| NA | 742 |
| Phase 1 | 696 |
| Phase 4 | 215 |
| Early Phase 1 | 25 |
Top Conditions
Top Sponsors
Where trials run in Arizona
Phoenix carries 2,754 of Arizona's 5,607 indexed trials (49%) across 1,101 named sites, ahead of Tucson at 1,809. 8 cities clear five listed trials, together naming 3,033 distinct sites.
| City | Trials | Listed sites |
|---|---|---|
| Phoenix | 2,754 | 1,101 |
| Tucson | 1,809 | 736 |
| Scottsdale | 1,294 | 434 |
| Gilbert | 372 | 139 |
| Chandler | 363 | 187 |
| Mesa | 335 | 163 |
| Tempe | 254 | 127 |
| Glendale | 219 | 146 |
Distinct trials and named sites per city, as filed with ClinicalTrials.gov; cities under five trials omitted. Vintage 2026-08-08.
Volume high
Arizona indexes 5,607 in-state trials (p80 by registry volume among 52 states with sites).
Arizona: in-state trial volume sits in the high tercile
Sites spread across 8 cities with five or more listed trials, led by Phoenix (2,754, 49% of the state total) and Tucson (1,809), together naming 3,033 distinct research locations.
Phase mix: 1,954 Phase 3 vs 1,449 Phase 2 (balanced across stages).
Top condition: Breast Cancer (111 trials); top sponsor National Cancer Institute (NCI) (231).
high-volume · low-open figures (5,607 trials · 30% open) describe registry geography under the volume high read, not clinic capacity or protocol fit. Confirm status on ClinicalTrials.gov before acting.
States near Arizona on in-state trial volume
Cross-state peers under the volume high read (high-volume · low-open), not the same-state browse list.
Similar high-volume hubs (± open share)
- North Carolina · 5,625 trials · 33% recruiting
- Colorado · 5,273 trials · 31% recruiting
- Georgia · 5,195 trials · 32% recruiting
- Michigan · 4,790 trials · 34% recruiting
- Maryland · 6,441 trials · 34% recruiting
Similar low-open peers (± trial volume)
- Nebraska · 29% recruiting · 1,301 trials
- Kansas · 29% recruiting · 2,080 trials
- South Dakota · 31% recruiting · 273 trials
- New Mexico · 29% recruiting · 579 trials
- Indiana · 29% recruiting · 3,113 trials