Clinical Trials / Browse by Phase / N/A (Early Phase / Not Applicable)

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

6,827

Recruiting Now

6,827

Top Conditions in N/A (Early Phase / Not Applicable)

Stroke (111) Breast Cancer (103) Cancer (89) Heart Failure (75) Obesity (70) Anxiety (58) Lung Cancer (57) Prostate Cancer (57) Depression (54) Coronary Artery Disease (50)

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

NCT07554755 N/A

TIS for NSSI in Adolescent Depression

Temporal Interference Stimulation

The Second Hospital of Anhui M

NCT07580755 N/A

Mesenchymal Stem Cells in the Treatment of Burn Wounds

The First Affiliated Hospital

NCT05720078 N/A

UNIty-Based MR-Linac Guided Adaptive RadioThErapy for High GraDe Glioma-3 (UNITE...

Glioblastoma Multiforme, Adult

Sunnybrook Health Sciences Cen

NCT06873685 N/A

Soft Tissue Sarcoma: Motor Performance, Robotic Rehabilitation, Nutrition, and Q...

Sarcoma, Soft Tissue

Fondazione Policlinico Univers

NCT07483385 N/A

Efficacy and Safety of Lusutrombopag After Allogeneic Hematopoietic Stem Cell Tr...

Patients With Hematologic Disorders After Allogeneic Hematopoietic Stem Cell Transplantation

The General Hospital of Wester

NCT06674785 N/A

SIRS-ESWT Trial: Shoulder Internal Rotator Spasticity Trial Treated With Extraco...

National Taiwan University Hos

NCT07002008 N/A

The Effects of Scapular Stabilization Exercises in Traditional Archery Athletes

Turkey (Türkiye)

Karabuk University

NCT07515508 N/A

Multimodal Phenotyping In Patients Referred With Acute Cardiac faiLurE

Cardiogenic Shock

University Heart Center Freibu

NCT06703008 N/A

Intraoperatory Hemodynamic Monitoring in OLT

Liver Transplantation

IRCCS Azienda Ospedaliero-Univ

NCT04414878 N/A

VitaFlow™ II Transcatheter Aortic Valve System Pre-market Trial

Aortic Stenosis

Shanghai MicroPort CardioFlow

NCT06479278 N/A

Talk With Me Baby to Enhance the Early Home Language Environment

Language Development

IDeA States Pediatric Clinical

NCT07034976 N/A

Efficacy of Non-ablative Radiofrequency Combined With Pelvic Floor Muscle Traini...

Genitourinary Syndrome of Menopause (GSM)

Fundacion para la Investigacio

NCT06661876 N/A

Cardiac RadiothErapy For hEart faiLure

Universitaire Ziekenhuizen KU

NCT06877715 N/A

Autistic Symptomatology and Sensory Profile in Children With Prader-Willi Syndro...

Prader-Willi Syndrome

University Hospital, Toulouse

NCT07022015 N/A

Predictive Risk Factors for Pancreatic Fistula After Pancreaticoduodenectomy

Pancreas Cancer

Minia University

NCT07428889 N/A

Nicotinamide Adenine Dinucleotide Responses to a Nutritional Supplement

Shaklee Corporation

NCT05829668 N/A

Behavioral Assessment and Treatment of Problem Behavior in Children With Corneli...

Cornelia de Lange Syndrome

Hugo W. Moser Research Institu

NCT07166068 N/A

The Effect of Mobilization on Inflammatory Biomarkers in Patients With Knee Oste...

Knee Osteoarthritis

University of Jazan

NCT05404750 N/A

Harm Reduction in HIV Primary Care for PLWH Who Use Drugs

Human Immunodeficiency Virus

University of Pittsburgh

NCT07103291 N/A

Effects of Isocapnic Respiratory Muscle Endurance Training in Healthy Adults

University of British Columbia

NCT04175691 N/A

Circulating Non-coding RNA in Acute Ischemic Stroke (AISRNA)

Nanjing First Hospital, Nanjin

NCT07069790 N/A

Effects of Chemotherapy Treatment on Metaboreflex, Mechanoreflex, and Baroreflex...

Breast Adenocarcinoma

Centre Paul Strauss

NCT07615790 N/A

Structured Combined Exercise Program in Postmenopausal Women: Effects on Heart R...

Turkey (Türkiye)

Fenerbahce University

NCT07171060 N/A

Laplace Early Feasibility Study - Canada

Tricuspid Regurgitation

Laplace Interventional, Inc

NCT06397560 N/A

PrOton Pulsed reduCed dOse Rate Radiotherapy for Recurrent CNS maligNancies Tria...

Baptist Health South Florida

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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: April 2026 · Data Methodology