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
NCT07392216 N/A
Recruiting
Functional Ovarian Reserve in Sickle Cell Disease
Condition
Sickle Cell Disease
Enrollment
440 pts
Location
United States
Sponsor
St. Jude Children's Research H
NCT07498816 N/A
Recruiting
Impact of Immersive Virtual Reality (IVR) on Respiratory Effort: A Pilot Study i...
Condition
Virtual Reality
Enrollment
10 pts
Location
Chile
Sponsor
Pontificia Universidad Catolic
NCT05616416 N/A
Recruiting
International Big Data Centre in Emergency Medicine
Condition
Emergency Medicine
Enrollment
500,000 pts
Location
China
Sponsor
Guangdong Provincial People's
NCT07349316 N/A
Recruiting
The Effects of Weight and Nutrition Education on Weight Control Beliefs, Body Im...
Condition
Dietary Restraint
Enrollment
150 pts
Location
Canada
Sponsor
St. Joseph's Healthcare Hamilt
NCT03611816 N/A
Recruiting
Biological Bank for Atrial Fibrillation and Stroke
Condition
Stroke
Enrollment
1,000 pts
Location
France
Sponsor
Hospices Civils de Lyon
NCT07786116 N/A
Recruiting
The Role of METhanogens in the PROgression Of Parkinson's Disease and Related Ne...
Condition
PARKINSON DISEASE (Disorder)
Enrollment
215 pts
Location
United Kingdom
Sponsor
University of Cambridge
NCT06960083 N/A
Recruiting
Transcranial Magnetic Stimulation in Misophonia
Condition
Misophonia
Enrollment
60 pts
Location
United States
Sponsor
Icahn School of Medicine at Mo
NCT06573983 N/A
Recruiting
Fall Risk Identification and Management for Older Veterans
Condition
Fall Risk
Enrollment
108 pts
Location
United States
Sponsor
VA Office of Research and Deve
NCT06765941 N/A
Recruiting
PTeye vs Surgeons Eyes in Intraoperative Identification and Functional Preservat...
Condition
Thyroid Surgery
Enrollment
154 pts
Location
Poland
Sponsor
Marcin Barczynski
NCT06132854 N/A
Recruiting
VR Based Simulation in the Preparation of Children for MRI - MRVR
Condition
Children, Only
Enrollment
288 pts
Location
Hungary
Sponsor
Semmelweis University
NCT06822205 N/A
Recruiting
Identification and Treatment of Renal Stenosis in Transplanted Kidneys
Condition
Renal Artery Stenosis
Enrollment
30 pts
Location
Italy
Sponsor
IRCCS Azienda Ospedaliero-Univ
NCT07381166 N/A
Recruiting
The Effect of İnhaler Training and Reminders on Medication on Adherence in Elder...
Condition
Elderly (People Aged 65 or More)
Enrollment
64 pts
Location
Turkey (Türkiye)
Sponsor
Çanakkale Onsekiz Mart Univers
NCT04517266 N/A
Recruiting
Evaluating Omitting of Internal Mammary Irradiation Among Early Stage Intermedia...
Condition
Breast Cancer
Enrollment
214 pts
Location
China
Sponsor
Ruijin Hospital
NCT00760656 N/A
Recruiting
Establishment of a Lifetime of Cohort of Adults Surviving Childhood Cancer
Condition
Cancer
Enrollment
10,000 pts
Location
United States
Sponsor
St. Jude Children's Research H
NCT06809829 N/A
Recruiting
Evaluation of Doxycycline Nanoparticle With Gelatin Sponge on Immediate Implant ...
Condition
Immediate Implant Placement
Enrollment
16 pts
Location
Egypt
Sponsor
Kafrelsheikh University
NCT05487131 N/A
Recruiting
Neuromodulation and Fatigue
Condition
Healthy Aging
Enrollment
40 pts
Location
United States
Sponsor
University of Oklahoma
NCT07522931 N/A
Recruiting
Systematic Anatomical Description of the Female Pelvic Retroperitoneum in Cadave...
Condition
Pelvic Anatomy
Enrollment
20 pts
Location
Spain
Sponsor
Hospital Universitari de Bellv
NCT07026331 N/A
Recruiting
Effect of Balloon Angioplasty vs Stenting Following Residual Stenosis After Endo...
Condition
Acute Ischemic Stroke
Enrollment
486 pts
Location
China
Sponsor
Beijing Anzhen Hospital
NCT07825831 N/A
Recruiting
AI-Assisted Personalized Heat-Risk Alerts
Condition
Heat-related Illness
Enrollment
120 pts
Location
Pakistan
Sponsor
National University of Medical
NCT07648953 N/A
Recruiting
Microvideos for Improving HPV Vaccination Among Childhood Cancer Survivors
Condition
HPV Vaccination
Enrollment
55 pts
Location
United States
Sponsor
University of Utah
NCT07219537 N/A
Recruiting
A Study for Imaging the Lower Gastrointestinal Tract Using a Retro-TCE Capsule
Condition
Lynch Syndrome
Enrollment
30 pts
Location
United States
Sponsor
Massachusetts General Hospital
NCT06637345 N/A
Recruiting
Identification of Prognostic and Predictive Biomarkers of Toxicity in Patients W...
Condition
Pleural Mesothelioma Malignant
Enrollment
52 pts
Location
Italy
Sponsor
Centro di Riferimento Oncologi
NCT07219095 N/A
Recruiting
Dance Mental Health App
Condition
Ankle Injury
Enrollment
50 pts
Location
United States
Sponsor
University of California, San
NCT06949995 N/A
Recruiting
Effects of Blood Flow Restriction on Post-Exercise Recovery in Amateur Runners
Condition
Recovery Methods
Enrollment
34 pts
Location
Brazil
Sponsor
Paulista University
NCT07740239 N/A
Recruiting
A COhort Study on Factors Leading to Vulnerability in Adult Patients With Seriou...
Condition
Pelvic Fracture
Enrollment
2,050 pts
Location
Finland
Sponsor
Tampere University Hospital
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