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

6,885

Recruiting Now

6,885

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

Stroke (113) Breast Cancer (104) Cancer (79) Obesity (68) Prostate Cancer (59) Coronary Artery Disease (51) Heart Failure (50) Cardiovascular Diseases (49) Lung Cancer (49) Healthy (49)

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

NCT07550647 N/A

Early Rehabilitation After Total Hip Arthroplasty

Total Hip Arthroplasty (THA)

Turkey (Türkiye)

Muğla Sıtkı Koçman University

NCT06774547 N/A

Early Implementation of Plyometric Exercises in the Rehabilitation of Individual...

Achilles Tendinopathy

Aalborg University

NCT06738758 N/A

Multicenter Real-World Cohort Study Evaluating the Impact of Early Intensive Lip...

Acute Coronary Syndromes

NCT02869555 N/A

Institut Paoli Calmettes Multiple Myeloma Database

Multiple Myeloma

Institut Paoli-Calmettes

NCT07783178 N/A

EARLY Pregnancy GLucose prOfiles in Women With and Without GDM Risk Factors: EAR...

Gestational Diabetes

DCB Research AG

NCT07691385 N/A

Prevention of Pain Induced During Bed Bath in Ehpad

NCT05672615 N/A

Mood Alterations in the Patients With Non-Muscle Invasive Bladder Cancer Treated...

Non-Muscle Invasive Bladder Cancer

Johns Hopkins University

NCT04965025 N/A

Multi-stage Urethroplasty with Augmentation Using a Dorsal Graft Inlay Technique...

Urethra Stenosis

University Hospital, Ghent

NCT07713940 N/A

Effect of Anti-inflammatory Diet in Systemic Lupus Erythematous

Systemic Lupus Erthematosus (SLE)

University of California, San

NCT06553989 N/A

Impact on Quality of Life of Osteopathic Visceral Mobilizations After Endometrio...

University Hospital, Clermont-

NCT07780240 N/A

Axillary Web Syndrome After Breast Cancer Surgery: Incidence, Risk Factors, and ...

Axillary Web Syndrome

Turkey (Türkiye)

Antalya City Hospital

NCT07758140 N/A

Comparative Self-collection for Cervical Cancer Screening Pivotal Study

Mel Mont Medical

NCT06527768 N/A

Theory-based Health Behaviour Change Intervention in Patients of Metabolic Syndr...

Chronic Kidney Diseases

Chinese University of Hong Kon

NCT07323498 N/A

Enhancing Generalization of Virtual Reality Exposure for Public Speaking Anxiety

Public Speaking Anxiety

Philipps University Marburg

NCT06972121 N/A

Digital Mindset Intervention for Half Marathon Performance

University of Auckland, New Ze

NCT07317921 N/A

Validating IAAO for Muscle Outcomes

Protein Metabolism

University of Toronto

NCT07211321 N/A

Linking Diet, Inflammation, Gut Microbiota, and Sarcopenia: A Cross-Sectional St...

NCT07142304 N/A

The Lilac Device Trial - IMPACT: A Clinical Investigation on IMproving Periphera...

Chemotherapy Induced Peripheral Neuropathy (CIPN)

United States, Ireland

Luminate Medical, Inc.

NCT07354633 N/A

Full Sail Ahead, Sailing in Psychosocial Rehabilitation.

Psychiatric Disorder

Centre hospitalier de Ville-Ev

NCT06648447 N/A

Investigation of the Efficacy and Tolerability of Topical Applied Tirbanibulin o...

Actinic Keratosis (AK)

Thomas Dirschka

NCT06212349 N/A

Therapeutic-educational Physiotherapy on Pain, Physical-functionality and Qualit...

University of Valencia

NCT04224038 N/A

The Inspire Bio-resource Research Platform for Healthy Aging INSPIRE Platform

Biological Aging

University Hospital, Toulouse

NCT07144748 N/A

68Ga-NYM096 PET/CT in Various Kinds of Cancer

Peking Union Medical College H

NCT06692855 N/A

Prognostic Value of the Rockwood Clinical Frailty Score in Cardiogenic Shock

Cardiogenic Shock

University Hospital, Strasbour

NCT06527248 N/A

Nitrate, Exercise and Vascular Function in Midlife Women

University of Vienna

Page 2 of 276 — 6,885 trials total

← Prev Next →

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