2026 data ClinicalTrials.gov official source

Conditions: C

Compiled by PlainTrial Editorial, Clinical Trial Intelligence Editorial Team · January 1, 2026

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

2,954 conditions starting with "C"

Showing 551–600 of 2,954

Condition	Trials	Recruiting
Castleman's Disease	4	3
Castleman's Disease (CD)	1	1
Castleman's Disease, Multicentric	1	-
Castrate Resistant Prostate Cancer	8	5
Castrate Sensitive Prostate Cancer	3	1
Castration Levels of Testosterone	5	1
Castration Resistant Metastatic Prostate Cancer	1	1
Castration Resistant Prostatic Cancer	6	3
Castration Sensitive Prostate Cancer	2	2
Castration-resistant	1	1
Castration-resistant Prostate Cancer	16	7
Castration-Resistant Prostate Cancer (CRPC)	1	1
Castration-Resistant Prostate Carcinoma	44	17
Castration-Resistant Prostatic Neoplasms	1	-
Castration-Sensitive Prostate Carcinoma	5	3
Cat Allergy	2	1
Cat Bite	1	1
Cataract	85	20
Cataract and IOL Surgery	2	2
Cataract Bilateral	2	1
Cataract Extraction	5	-
Cataract Senile	2	-
Cataract Surgery	8	4
Cataract Surgery Experience	1	-
Cataracts	9	-
Catastrophization	1	-
Catecholaminergic Polymorphic Ventricular Tachycardia	2	2
Catenin Beta-1 (CTNNB1) Gene Mutation	1	1
Catheter Blockage	1	1
Catheter Calcification	1	1
Catheter Complications	1	1
Catheter Dysfunction	1	1
Catheter Infection	3	3
Catheter Occlusion	1	-
Catheter Related Complication	3	1
Catheter-Associated Infection	1	-
Catheter-related Bloodstream Infection	1	-
Catheter-related Bloodstream Infections	1	-
Catheter-Related Infections	6	1
Catheterization	2	-
Catheterization for Postop Analgesia	1	-
Catheterization, Peripheral	3	-
Cauda Equina Syndrome	1	-
Caudal Anesthesia	1	-
Causalgia	1	-
Cavernous Angioma	1	-
Cavernous Angioma, Familial	1	-
Cavernous Nerve Injury	1	-
Cavernous Sinus Thrombosis	1	-
Cavities of Teeth	2	-

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