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
6,814
Recruiting Now
6,814
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
NCT04956133 N/A
Recruiting
IMPACT: IMplementation of Physical Activity for Children and Adolescents on Trea...
Condition
Pediatric Cancer
Enrollment
250 pts
Location
Canada
Sponsor
University of Calgary
NCT03908684 N/A
Recruiting
Ultrasound Spectroscopy as Early Indicators of Radiation Treatment Response in P...
Condition
Prostate Cancer
Enrollment
320 pts
Location
Canada
Sponsor
Sunnybrook Health Sciences Cen
NCT07034547 N/A
Recruiting
Effect of Botulinum Toxin Type A on Motor Function in Children With Cerebral Pal...
Condition
Cerebral Palsy (CP)
Enrollment
30 pts
Location
Chile
Sponsor
Instituto Teletón Chile
NCT06961149 N/A
Recruiting
Linked-Color Imaging Versus Indigo Carmine Pump Spraying on the Colorectal Adeno...
Condition
Colonic Polyps
Enrollment
352 pts
Location
China
Sponsor
Shandong University
NCT07424638 N/A
Recruiting
Interscalene Block Versus Anterior Suprascapular Block for Post-Thoracotomy Shou...
Condition
Interscalene Block
Enrollment
75 pts
Location
Egypt
Sponsor
National Cancer Institute, Egy
NCT07628647 N/A
Recruiting
Living Well With Brain Cancer: A Group-Based Intervention to Promote Whole-Perso...
Condition
Brain Cancer
Enrollment
64 pts
Location
United States
Sponsor
University of Colorado, Denver
NCT07499947 N/A
Recruiting
Predicting Spinal Hypotension in Cesarean Section
Condition
Spinal Anesthesia
Enrollment
321 pts
Location
Turkey (Türkiye)
Sponsor
TC Erciyes University
NCT05915377 N/A
Recruiting
Researching Efficient Approaches to Delirium Identification-Sustaining Effective...
Condition
Delirium
Enrollment
1,050 pts
Location
United States
Sponsor
Penn State University
NCT07109739 N/A
Recruiting
Dose-Response Effects of Inspiratory Muscle Strength Training on Blood Pressure ...
Condition
Systolic Hypertension
Enrollment
144 pts
Location
United States
Sponsor
University of Minnesota
NCT07522177 N/A
Recruiting
Animated Storytelling to Promote Colorectal Cancer Screening
Condition
Colorectal Cancer Screening
Enrollment
3,000 pts
Location
United States
Sponsor
Stanford University
NCT03538457 N/A
Recruiting
Bariatric Surgery and Pharmacokinetics of Paracetamol
Condition
Obesity, Morbid
Enrollment
12 pts
Location
Norway
Sponsor
Norwegian University of Scienc
NCT06517901 N/A
Recruiting
Fusion or Cognitive Ultrasound-guided Biopsy to Detect Prostate Cancer
Condition
Prostate Cancer
Enrollment
1,306 pts
Location
United States, Canada
Sponsor
Albany Medical College
NCT06670001 N/A
Recruiting
MOVE-HF MOtivating Physical Activity With BehaVioral Economics in Heart Failure ...
Condition
HFpEF - Heart Failure With Preserved Ejection Fraction
Enrollment
270 pts
Location
United States
Sponsor
University of Pennsylvania
NCT07123181 N/A
Recruiting
Oregano and Basil Leaves and Coronary Artery Disease
Condition
Acute Coronary Syndromes
Enrollment
70 pts
Location
Iran
Sponsor
Shahid Beheshti University of
NCT07681336 N/A
Recruiting
Auricular Vagus Nerve Stimulation in Patients With High Impact Chronic Low Back ...
Condition
Chronic Low Back Pain
Enrollment
44 pts
Location
Belgium
Sponsor
Algemeen Ziekenhuis Maria Midd
NCT05700071 N/A
Recruiting
MRS of Glioma Genomics
Condition
Glioma
Enrollment
110 pts
Location
France
Sponsor
Institut National de la Santé
NCT06526598 N/A
Recruiting
Inspiratory Effort-Targeted Pressure Support Ventilation (IT-PSV) Trial
Condition
Critical Care
Enrollment
619 pts
Location
China
Sponsor
Capital Medical University
NCT07630298 N/A
Recruiting
A Comparative Study of Driving Performance Among Adolescents With Autism Spectru...
Condition
Autism Spectrum Disorders
Enrollment
22 pts
Location
France
Sponsor
Hopital La Musse
NCT06718387 N/A
Recruiting
Evaluation of the Impact of Participation in a Psycho-education Program for Vict...
Condition
Ptsd
Enrollment
60 pts
Location
France
Sponsor
Centre Hospitalier Charles Per
NCT06899087 N/A
Recruiting
DEciphering CIrculating SIgnatures Of Infected Pancreatic Necrosis
Condition
Acute Pancreatitis
Enrollment
45 pts
Location
United States
Sponsor
University of Minnesota
NCT06569693 N/A
Recruiting
Dyadic Sleep Study
Condition
Gastrointestinal Cancer
Enrollment
152 pts
Location
United States
Sponsor
University of Miami
NCT06921967 N/A
Recruiting
Effect of Corneal and Scleral RGP Lenses on Ocular Health and Visual Quality in ...
Condition
Keratoconus
Enrollment
50 pts
Location
Denmark
Sponsor
University of Aarhus
NCT07488936 N/A
Recruiting
Effects of Low Back Pain Types on Pain Severity and Quality of Life in Patients ...
Condition
Failed Back Surgery Syndrome
Enrollment
200 pts
Location
Turkey (Türkiye)
Sponsor
Konya Beyhekim Training and Re
NCT07048171 N/A
Recruiting
TO DETERMINE THE EFFECT OF ALLOGRAFT AND iPRF WITH OR WITHOUT COLLAGEN MEMBRANE ...
Condition
Apicomarginal Defects
Enrollment
50 pts
Location
India
Sponsor
Postgraduate Institute of Dent
NCT04885244 N/A
Recruiting
Prospective Evaluation of Complex Adult Spinal Deformity (CAD) Treated With Mini...
Condition
Adult Spinal Deformity
Enrollment
500 pts
Location
United States
Sponsor
International Spine Study Grou
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