2026 data ClinicalTrials.gov official source

Conditions: O

Every condition beginning with O that has a registered US clinical trial, with how many studies cover each.

829 conditions starting with "O"

Showing 451–500 of 829

Condition Trials
Ornithine Transcarbamylase (OTC) Deficiency 2
Ornithine Transcarbamylase Deficiency 5
Ornithine Transcarbamylase Deficiency Disease 1
Ornithine-δ-aminotransferase 1
Oro-Facial-Digital Syndrome Type I 1
Orodental Injury 1
Orofacial Myofunctional Disorders 1
Orofacial Pain 1
Oromandibular Dystonia 1
Oropharyngeal Basaloid Carcinoma 1
Oropharyngeal Cancer 26
Oropharyngeal Cancers 2
Oropharyngeal Candidiasis 2
Oropharyngeal Carcinoma 8
Oropharyngeal Dysphagia 8
Oropharyngeal Dysplasia 1
Oropharyngeal HPV-Positive Squamous Cell Carcinoma 1
Oropharyngeal Human Papillomavirus-Positive Squamous Cell Carcinoma 1
Oropharyngeal Neoplasms 3
Oropharyngeal p16INK4a-Negative Squamous Cell Carcinoma 1
Oropharyngeal Squamous Cell Carcinoma 15
Oropharyngeal Squamous Cell Carcinoma (OPSCCA) 1
Oropharyngeal Squamous Cell Carcinoma (SCC) 1
Oropharyngeal Tumor 1
Oropharynx 2
Oropharynx Cancer 27
Oropharynx Squamous Cell Carcinoma 7
Orphan Diseases 1
Orthodontic Aligner 1
Orthodontic Appliance 1
Orthodontic Appliance Complication 2
Orthodontic Discomfort 1
Orthodontic Pathological Resorption of External Root 1
Orthodontic Tooth Movement 1
Orthodontic Treatment 3
Orthodontics 2
Orthognathic Surgery 1
Orthognathic Surgical Procedures 2
Orthomyxoviridae Infection 1
Orthopaedic Fractures 2
Orthopaedic Injuries 1
Orthopaedic Injury 1
Orthopaedic Related Pain (Musculoskeletal Pain) 1
Orthopaedic Trauma 2
Orthopaedic Trauma Infections 1
Orthopedic Devices Associated With Misadventures 1
Orthopedic Devices Associated With Misadventures, Surgical Instruments, Materials and Devices (Including Sutures) 1
Orthopedic Disorder 11
Orthopedic Disorders 1
Orthopedic Injury 1

Related

Data sourced from official public datasets. See our methodology for details.