Browse by Phase
N/A (Early Phase / Not Applicable) Clinical Trials
Browse currently recruiting N/A (Early Phase / Not Applicable) clinical trials registered on ClinicalTrials.gov.
Total Trials
6,771
Recruiting Now
6,771
Top Conditions in N/A (Early Phase / Not Applicable)
Frequently Asked Questions — N/A (Early Phase / Not Applicable) Trials
What does "N/A" mean for a clinical trial phase?
"N/A" or "Not Applicable" in the phase field indicates the trial does not follow the traditional Phase 1–4 drug development pathway. This applies to observational studies, epidemiological research, behavioral interventions, device studies, or exploratory work not yet assigned a formal phase. These studies are still registered on ClinicalTrials.gov and follow IRB-approved protocols.
Are N/A phase trials safe to participate in?
N/A phase trials encompass a wide range of study types, many involving minimal risk—such as observational studies, questionnaire-based research, or registry enrollment. Some may involve investigational devices or early-stage interventions. Review the trial's protocol, risks and benefits section, and informed consent documents carefully before enrolling. All ClinicalTrials.gov-registered studies must comply with applicable safety oversight requirements.
How do I find N/A phase trials for my condition?
Browse ClinicalMetric by condition to find all trials—regardless of phase—that are recruiting for a specific disease. Many N/A phase trials are observational or behavioral studies with fewer eligibility restrictions than phase-designated drug trials, making them more accessible to a broader range of participants.
Active N/A (Early Phase / Not Applicable) Studies
NCT01166854 N/A
Recruiting
Characterization of Familial Myopathy and Paget Disease of Bone
Condition
Muscle Disorder
Enrollment
25 pts
Location
United States
Sponsor
University of California, Irvi
NCT06684197 N/A
Recruiting
The Impact of a Dexmedetomidine Perfusion on Intraoperative Remifentanil Consump...
Condition
Dexmedetomidine
Enrollment
72 pts
Location
Canada
Sponsor
Ciusss de L'Est de l'Île de Mo
NCT04753996 N/A
Recruiting
Characterization of Biliary Cell-derived Organoids From Bile of PSC and Non-PSC ...
Condition
Primary Sclerosing Cholangitis
Enrollment
300 pts
Location
United States
Sponsor
Mayo Clinic
NCT07252362 N/A
Recruiting
LCMS-Based Metabolic Analysis Explores the Effect of American Ginseng on Urine a...
Condition
The Impact of American Ginseng on the Metabolomics of Urine and Plasma in Healthy Individuals
Enrollment
20 pts
Location
China
Sponsor
Zhejiang Cancer Hospital
NCT05022446 N/A
Recruiting
The Impact of COVID-19 on Pulmonary Procedures
Condition
COVID-19 Infection
Enrollment
250 pts
Location
United States
Sponsor
M.D. Anderson Cancer Center
NCT06845046 N/A
Recruiting
A Study to Improve Skeletal Muscle in Veterans With HIV
Condition
HIV
Enrollment
70 pts
Location
United States
Sponsor
VA Office of Research and Deve
NCT07725003 N/A
Recruiting
Telerehabilitation Based Motor Relearning Program and Telerehabilitation Based C...
Condition
Stroke
Enrollment
30 pts
Location
Pakistan
Sponsor
Riphah International Universit
NCT07701161 N/A
Recruiting
Development of a Home Test for Measuring Blood P-tau217 in Alzheimer's Disease U...
Condition
Alzheimer s Disease
Enrollment
1,000 pts
Location
United States
Sponsor
Neurogen Biomarking LLC
NCT07435142 N/A
Recruiting
A Single-Center Clinical Study to Evaluate the Efficacy and Safety of Autologous...
Condition
Cornea Disease
Enrollment
3 pts
Location
China
Sponsor
Suxia Li
NCT05193305 N/A
Recruiting
Study of Healthy Cohort for Early Detection of Cancer
Condition
Healthy
Enrollment
10,000 pts
Location
United States
Sponsor
Johns Hopkins University
NCT07584356 N/A
Recruiting
A Study Comparing Shoulder Replacement Techniques For Patients With Shoulder Art...
Condition
Shoulder Arthritis
Enrollment
108 pts
Location
United States
Sponsor
Mayo Clinic
NCT06606756 N/A
Recruiting
CEDATA GPGE - a Patient Registry for Children and Adolescents With Inflammatory ...
Condition
Inflammatory Bowel Disease (IBD)
Enrollment
6,300 pts
Location
Germany
Sponsor
University of Giessen
NCT06101056 N/A
Recruiting
Code of Respect (X-CoRe): Trial of a Multi-level Sexual Assault and Sexual Haras...
Condition
Sexual Assault
Enrollment
1,200 pts
Location
United States
Sponsor
The University of Texas Health
NCT06701851 N/A
Recruiting
Neural Correlates of Movement Disorders Associated With PRRT2 Related Paroxysmal...
Condition
Paroxysmal Dyskinesia
Enrollment
1 pts
Location
France
Sponsor
Institut National de la Santé
NCT06663813 N/A
Recruiting
Enhancing Preventative Health Behaviors Among Emergency Department Hyperglycemic...
Condition
Type 2 Diabetes
Enrollment
400 pts
Location
United States
Sponsor
Rutgers, The State University
NCT06639360 N/A
Recruiting
Effects of Transcranial Magnetic Stimulation After Endovascular Treatment for Ac...
Condition
Ischemic Stroke, Acute
Enrollment
60 pts
Location
China
Sponsor
Xijing Hospital
NCT04807660 N/A
Recruiting
Bacteriological Evaluation of Children With Otorrhea
Condition
Otorrhea
Enrollment
1,500 pts
Location
France
Sponsor
Association Clinique Thérapeut
NCT07697924 N/A
Recruiting
CURENDO (Cord-blood Uterine Regeneration Endometrium): Platelet-rich Plasma Ther...
Condition
Asherman Syndrome
Enrollment
35 pts
Location
Spain
Sponsor
Fundación IVI
NCT07789223 N/A
Recruiting
Weight and Metabolic Management Study
Condition
Overweight
Enrollment
200 pts
Location
United Kingdom
Sponsor
Elenzia
NCT07131059 N/A
Recruiting
MRD-positive AML Clinical Study
Condition
AML, Adult
Enrollment
537 pts
Location
China
Sponsor
Institute of Hematology & Bloo
NCT06464159 N/A
Recruiting
New Therapeutic Strategy Against Preeclampsia
Condition
Preeclampsia
Enrollment
100 pts
Location
France
Sponsor
Assistance Publique - Hôpitaux
NCT06649162 N/A
Recruiting
A Study to Identify the Risk of Non-alcoholic Fatty Liver Disease (NAFLD) in Pat...
Condition
Type 2 Diabetes
Enrollment
10,000 pts
Location
South Korea
Sponsor
Boryung Pharmaceutical Co., Lt
NCT07472127 N/A
Recruiting
Professional Readiness Through Emotional Preparedness (PREP)
Condition
Burnout
Enrollment
212 pts
Location
United States
Sponsor
AdventHealth
NCT07485361 N/A
Recruiting
fNIRS for Disorders of Consciousness
Condition
Disorders of Consciousness Due to Severe Brain Injury
Enrollment
55 pts
Location
United States
Sponsor
University of California, Los
NCT06452186 N/A
Recruiting
Restoration of Normative Postural Control
Condition
Lower Limb Amputation Below Knee (Injury)
Enrollment
50 pts
Location
United States
Sponsor
North Carolina State Universit
ClinicalMetric — Independent clinical trial intelligence platform. Not affiliated with NIH, ClinicalTrials.gov, the U.S. FDA, or any pharmaceutical company, hospital, or clinical research organization. Trial data is sourced from ClinicalTrials.gov for informational purposes only and does not constitute medical advice. Do not make any treatment, enrollment, or health decisions based solely on information found here — always consult a qualified healthcare professional. Full Disclaimer · Last Reviewed: November 2026 · Data Methodology