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
NCT07432113 N/A
Recruiting
Prediction of Infectious Agents in the Biofire® FilmArray bioMérieux Meningitis/...
Condition
Meningitis
Enrollment
182 pts
Location
Brazil
Sponsor
Federal University of Health S
NCT07858760 N/A
Recruiting
Study of the Care Pathway of Patients Admitted to the Palliative Care Unit of St...
Condition
Advanced Chronic Disease
Enrollment
80 pts
Location
France
Sponsor
University Hospital, Strasbour
NCT07056920 N/A
Recruiting
Evaluation of Horizontal Bone Gain of Ridge Augmentation Using Customized Porous...
Condition
Horizontal Ridge Deficiency
Enrollment
10 pts
Location
Egypt
Sponsor
Ahmed Shawky
NCT07235982 N/A
Recruiting
Shoulder Anterior Capsular Block and Intraarticular Steroid Injection Versus Int...
Condition
Analgesia
Enrollment
50 pts
Location
Egypt
Sponsor
Zagazig University
NCT07358182 N/A
Recruiting
Efficacy and Safety of Trastuzumab-rezetecan in HER2-Expressing Breast Cancer
Condition
Trastuzumab-rezetecan
Enrollment
300 pts
Location
China
Sponsor
Sun Yat-Sen Memorial Hospital
NCT07619846 N/A
Recruiting
Using Chin Bone Rings for Sinus Lifting and Dental Implants in One Surgery
Condition
Maxillary Deficiency
Enrollment
10 pts
Location
Syria
Sponsor
Damascus University
NCT06443346 N/A
Recruiting
Prospective Registry of EoSinophilic esOphagitis
Condition
Eosinophilic Esophagitis
Enrollment
1,000 pts
Location
Italy
Sponsor
IRCCS San Raffaele
NCT05652361 N/A
Recruiting
Machine Learning-based Surgical Guidance System for Robot-assisted Rectal Surger...
Condition
Rectum Cancer
Enrollment
12 pts
Location
Germany
Sponsor
Technische Universität Dresden
NCT05514327 N/A
Recruiting
A Study of Ultra-fraction Radiotherapy Bridging CART in R/R DLBCL
Condition
Diffuse Large B Cell Lymphoma
Enrollment
20 pts
Location
China
Sponsor
Peking Union Medical College H
NCT06771427 N/A
Recruiting
Exosomes Proteomic for Sjogren's Syndrome and Dry Eye Syndrome
Condition
Dry Eye Syndrome (DES)
Enrollment
220 pts
Location
Taiwan
Sponsor
Taipei Veterans General Hospit
NCT06202027 N/A
Recruiting
Post Marketing Surveillance Study to Observe Safety and Effectiveness of CRYSVIT...
Condition
FGF23-related Hypophosphataemic Rickets and Osteomalacia
Enrollment
100 pts
Location
South Korea
Sponsor
Kyowa Kirin Korea Co., Ltd.
NCT07804927 N/A
Recruiting
STRess Assessment of INterventional Cardiology Fellows and Attendings
Condition
Stress
Enrollment
15 pts
Location
United States
Sponsor
Minneapolis Heart Institute Fo
NCT07562542 N/A
Recruiting
Peripheral Blood KIT-D816V Mutation in Adult Systemic Mastocytosis
Condition
Systemic Mastocytosis
Enrollment
50 pts
Location
China
Sponsor
The First Affiliated Hospital
NCT05236686 N/A
Recruiting
Survival Effect of Hepato-celiac Lymphadenectomy In Primary or Relapsed Ovarian ...
Condition
Epithelial Ovarian Cancer
Enrollment
94 pts
Location
China
Sponsor
Shanghai Gynecologic Oncology
NCT03979170 N/A
Recruiting
Patient-derived Organoids of Lung Cancer to Test Drug Response
Condition
Lung Cancer
Enrollment
50 pts
Location
Switzerland
Sponsor
University Hospital, Geneva
NCT06852170 N/A
Recruiting
Data2Action Oregon Project: Supporting Data-driven Decision-Making for Substance...
Condition
Substance Abuse
Enrollment
341 pts
Location
United States
Sponsor
Chestnut Health Systems
NCT06267469 N/A
Recruiting
Boutonniere Deformity Effectiveness of Thermoplastic and Fabricated Orthoses
Condition
Orthotic Devices
Enrollment
60 pts
Location
Poland
Sponsor
Magdalena Kolasińska
NCT05188183 N/A
Recruiting
Pragmatic Trial of Remote tDCS and Somatosensory Training for Phantom Limb Pain ...
Condition
Phantom Limb Pain
Enrollment
290 pts
Location
United States
Sponsor
Spaulding Rehabilitation Hospi
NCT07077473 N/A
Recruiting
Observing the Efficacy and Safety of Different Drugs Used in Real-world Familial...
Condition
Familial Mediterranean Fever (FMF )
Enrollment
12 pts
Location
China
Sponsor
Tongji Hospital
NCT06619769 N/A
Recruiting
eSense-Cancer: Adapting an Online Intervention for Sexual Health Concerns to Gyn...
Condition
Gynecologic Cancers
Enrollment
60 pts
Location
Canada
Sponsor
University of British Columbia
NCT06089083 N/A
Recruiting
PROmOting Gynecologic Cancer Patients With Frailty to Achieve Functional Recover...
Condition
Malignant Female Reproductive System Neoplasm
Enrollment
500 pts
Location
United States
Sponsor
University of California, San
NCT07027254 N/A
Recruiting
PETAL Trial: Impact of Gallium-68 Pentixafor PET-CT on Surgical Outcomes in Prim...
Condition
Primary Aldosteronism
Enrollment
90 pts
Location
South Korea
Sponsor
Seoul National University Hosp
NCT07230769 N/A
Recruiting
Bougie Diameter on Outcomes in Laparoscopic Sleeve Gastrectomy
Condition
Bariatric Sleeve Gastrectomy
Enrollment
100 pts
Location
Egypt
Sponsor
General Committee of Teaching
NCT06807983 N/A
Recruiting
LUng and Cardiac Ultrasound for REspiratory Distress in ElDerly
Condition
Dyspnea
Enrollment
504 pts
Location
France
Sponsor
University Hospital, Toulouse
NCT06717022 N/A
Recruiting
A Clinical Study of CHT102 in Mesothelin Positive Advanced Solid Tumors
Condition
Mesothelin Positive Tumors
Enrollment
24 pts
Location
China
Sponsor
Tianjin Medical University Can
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