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

NCT02402244 N/A

Project: Every Child for Younger Patients With Cancer

Adrenal Gland Pheochromocytoma

United States, Australia, Canada

Children's Oncology Group

NCT06824909 N/A

Endoscopic Ultrasound-guided Fine-needle Aspiration of Solid Pancreatic Lesions ...

Pancreatic Disease

Ruijin Hospital

NCT06449664 N/A

Training for Men Undergoing Androgen Deprivation Therapy.

Prostate Cancer

The Swedish School of Sport an

NCT06221332 N/A

Sacral Erector Spinae Plane Block in Normal Birth

Turkey (Türkiye)

Konya City Hospital

NCT07378163 N/A

Study on the Preferences for PCI Implantation Devices Among Doctors and Patients

Coronary Artery Disease

Xijing Hospital

NCT06075563 N/A

Total Lymphoid Irradiation as Conditioning for Pediatric Haploidentical Hematopo...

Hematopoietic Organs; Disorder

Hong Kong Children's Hospital

NCT06494163 N/A

Exercise Training in Women With Heart Disease 2

Cardiovascular Diseases

Ottawa Heart Institute Researc

NCT07783087 N/A

A Study Comparing an Investigational Wound Gel With Standard Treatment for Mild ...

Diabetic Foot Ulcer (DFU)

NCT06702293 N/A

Use of a Digital Psychotherapeutic App to Reduce Symptom Burden in Dermatology P...

National University Hospital,

NCT07648693 N/A

Evaluation of the Safety and Effectiveness of CHORDS® Cerebral Protection System...

Transcatheter Aortic Valve Replacement (TAVR)

Resonova (Shanghai) Medtech Li

NCT07213258 N/A

CHAMPION: Combining HIV And Meth Prevention and Treatment Interventions Optimize...

University of California, San

NCT07676058 N/A

Comparative Effects of Myofascial Release and Instrument Assisted Soft Tissue Mo...

Plantar Fasciitis

University of Lahore

NCT04985058 N/A

Real-world Data in Patients With Breast Cancer Treated With Abemaciclib

Hellenic Cooperative Oncology

NCT07653048 N/A

Personality Traits and Biochemical Risk Phenotypes

Medical Center TOPMED

NCT07329478 N/A

Effects of Muscle Specific as Compared to Movement Specific Muscle Energy Techni...

Foundation University Islamaba

NCT03216785 N/A

SNUH MICU Cohort Study of PICS

Seoul National University Hosp

NCT06690385 N/A

DEPRECAP: Lung Cancer Screening Programme by LDCT for Patients With COPD or Emph...

Instituto de Investigación San

NCT06839443 N/A

Deep Learning in the Detection and Prediction of Hydroxychloroquine Maculopathy

Hidroxicloroquine Intake

Centro Hospitalar de Lisboa Ce

NCT05649943 N/A

Multimodal Approach in Patients With mHSPC. Randomized Trial of APA+ADT vs APA-A...

Metastatic Hormone-Sensitive Prostate Cancer (mHSPC)

Fondazione IRCCS Istituto Nazi

NCT02775643 N/A

Molecular Analysis of Childhood and Adolescent Melanocytic Lesions

St. Jude Children's Research H

NCT06249308 N/A

Liquid Biopsy-based Early Detection of Ovarian Cancer: a Proof-of-concept Study ...

Fudan University

NCT05886725 N/A

At-home Walking Cadence Functional Assessment and Recovery Trajectory for Older ...

University of Chicago

NCT06902233 N/A

Brain Network Stimulation for Chronic Low Back Pain.

Chronic Low Back Pain (CLBP)

University of Otago

NCT07329933 N/A

Dexamethasone, Dexmedetomidine and Their Combination on Post op. GIT Function Me...

Benha University

NCT02795052 N/A

Neurologic Stem Cell Treatment Study

Neurologic Disorders

United States, United Arab Emirates

Page 1 of 276 — 6,885 trials total

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