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
6,885
Recruiting Now
6,885
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
NCT07307417 N/A
Recruiting
Assessment of Respiratory Dysfunction in Obesity and the Use of IMT.
Condition
Obesity & Overweight
Enrollment
40 pts
Location
Poland
Sponsor
Wroclaw University of Health a
NCT06287840 N/A
Recruiting
Canadian Bone Strength Development Study
Condition
Type-1 Diabetes
Enrollment
204 pts
Location
Canada
Sponsor
University of Saskatchewan
NCT06785350 N/A
Recruiting
Minimum Effective Dose of Incisional Local Infiltration Betamethasone for the Pr...
Condition
Pain Management
Enrollment
535 pts
Location
China
Sponsor
Beijing Tiantan Hospital
NCT02061787 N/A
Recruiting
the Application of Cardiopulmonary Exercise Testing in Assessment Outcome of Pat...
Condition
Pulmonary Hypertension
Enrollment
4,000 pts
Location
China
Sponsor
Chinese Pulmonary Vascular Dis
NCT07784387 N/A
Recruiting
A Study to Characterize High-Risk Non-Muscle-Invasive Bladder Cancer Participant...
Condition
Urinary Bladder Neoplasms
Enrollment
250 pts
Location
Portugal
Sponsor
Janssen-Cilag Farmaceutica Ltd
NCT05194787 N/A
Recruiting
TAS Test: Online Motor-cognitive Tests for Early Detection of Alzheimer's Diseas...
Condition
Alzheimer Disease
Enrollment
3,000 pts
Location
Australia
Sponsor
University of Tasmania
NCT05901493 N/A
Recruiting
Category Learning Retention in Adults With and Without Developmental Language Di...
Condition
Developmental Language Disorder
Enrollment
540 pts
Location
United States
Sponsor
University of Delaware
NCT05100121 N/A
Recruiting
To Live Better After Prostate Cancer Treatment:
Condition
Prostate Cancer
Enrollment
40 pts
Location
Sweden
Sponsor
Karolinska Institutet
NCT07599306 N/A
Recruiting
Effectiveness of a Structured Multidimensional Tele-rehabilitation Intervention ...
Condition
Critical Illness
Enrollment
326 pts
Location
Italy
Sponsor
Fondazione Don Carlo Gnocchi E
NCT07322406 N/A
Recruiting
Kaempferol Absorption and Pharmacokinetics Evaluation
Condition
No Disease
Enrollment
120 pts
Location
United States
Sponsor
University of Pittsburgh
NCT06166706 N/A
Recruiting
Current Practice of Ventilation Strategies in Children Undergoing General Anesth...
Condition
Mechanical Ventilation Complication
Enrollment
10,000 pts
Location
Australia, Italy, Netherlands
Sponsor
Academisch Medisch Centrum - U
NCT06645106 N/A
Recruiting
Offering Routine and Rapid Point of Care (POC) Syphilis Testing in Pregnant Pati...
Condition
Syphilis
Enrollment
1,500 pts
Location
United States
Sponsor
The University of Texas Health
NCT06401304 N/A
Recruiting
Oncologic, Cosmetic and Patient Reported Outcomes in Value-Based Breast Surgery ...
Condition
Breast Cancer
Enrollment
1,200 pts
Location
Australia, Sweden, United Kingdom
Sponsor
Uppsala University
NCT05829733 N/A
Recruiting
6-month Efficacy and Safety of Synolis VA 80/160 in Hip Osteoarthritis
Condition
Osteoarthritis, Hip
Enrollment
70 pts
Location
France
Sponsor
Aptissen SA
NCT00001252 N/A
Recruiting
Human Movement Database
Condition
Movement Disorder
Enrollment
7,500 pts
Location
United States
Sponsor
National Institutes of Health
NCT06997549 N/A
Recruiting
Retrospective Analyses of the Greenbrook Database Evaluating Mental Health Treat...
Condition
Depression
Enrollment
12,000 pts
Location
United States
Sponsor
Neuronetics
NCT07532538 N/A
Recruiting
A Machine Learning-Based Risk Prediction Model for Head and Neck Cancerous Lesio...
Condition
Hypopharyngeal Cancer
Enrollment
3,000 pts
Location
China
Sponsor
The Affiliated Nanjing Drum To
NCT06315348 N/A
Recruiting
Effect on Periodontal Phenotype of Flapless Piezoincission During Orthodontic Tr...
Condition
Dental Malocclusion
Enrollment
40 pts
Location
Spain
Sponsor
Universidad Complutense de Mad
NCT07679048 N/A
Recruiting
Measuring How Quickly the Eye Focuses After Sustained Viewing of Close-up Images...
Condition
Distance Viewing
Enrollment
20 pts
Location
United States
Sponsor
Rochester Institute of Technol
NCT03017755 N/A
Recruiting
Scoliosis Survey to Development Treatment Decision Tool
Condition
Scoliosis; Adolescence
Enrollment
5,000 pts
Location
United States
Sponsor
Mayo Clinic
NCT06481878 N/A
Recruiting
Validation of an Alzheimer's Disease Marker by Fecal Assay of Amyloid Peptides a...
Condition
Alzheimer Disease
Enrollment
115 pts
Location
France
Sponsor
University Hospital, Grenoble
NCT04813185 N/A
Recruiting
Preventing Retaliatory Gun Violence in Violently Injured Adults
Condition
Violence
Enrollment
616 pts
Location
United States
Sponsor
Virginia Commonwealth Universi
NCT05922085 N/A
Recruiting
Use of Ultrasound for Early Identification of Patients at Risk of Swallowing Dis...
Condition
Patient Under Mechanical Ventilation
Enrollment
100 pts
Location
France
Sponsor
Centre Hospitalier Universitai
NCT07175285 N/A
Recruiting
A Study in Participants With Active Systemic Lupus Erythematosus With Inadequate...
Condition
Systemic Lupus Erythematosus (SLE)
Enrollment
223 pts
Location
United States, Argentina, Brazil
Sponsor
Bristol-Myers Squibb
NCT07116785 N/A
Recruiting
Accelerated Rotational Field Deep TMS for Treating OCD
Condition
Obsessive-Compulsive Disorder
Enrollment
50 pts
Location
Israel
Sponsor
Ben-Gurion University of the N
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: September 2026 · Data Methodology