2026 data ClinicalTrials.gov official source

Conditions: C

Compiled by PlainTrial, Clinical Trial Intelligence Editorial Process · 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 1,151–1,200 of 2,954

Condition	Trials	Recruiting
Children Being Treated for Catastrophic Illness	1	1
Children of Mothers With Substance Use Disorders	1	-
Children Under 13	2	-
Children Under 2 Years	1	1
Children With Autism	1	-
Children With Behavioral Syndromes	1	1
Children With Cancer	1	-
Children With Cerebral Palsy	1	1
Children With Chronic Conditions	1	-
Children With Complex Chronic Conditions	1	-
Children With Disabilities	1	1
Children With Heart Transplants	1	-
Children With Medical Complexity	3	3
Children With Medical Complexity (CMC)	3	2
Children With Neurodevelopmental Disorders	1	1
Children With Neuropsychiatric Disorders	1	1
Children With Special Health Care Needs	1	-
Children, Adult	2	2
Children, Only	4	3
Children, Preschool	2	-
Chimera	1	-
Chimerism	2	1
Chlamydia	6	2
Chlamydia Infections	2	-
Chlamydia Pneumonia	1	-
Chlamydia Trachomatis	5	-
Chlamydia Trachomatis Infection	4	-
Chlamydial Infection	3	-
Chlamydial Infections	1	1
CHM (Choroideremia) Gene Mutations	1	-
Cholangiocarcinoma	61	36
Cholangiocarcinoma Advanced	1	1
Cholangiocarcinoma Metastatic	2	2
Cholangiocarcinoma Non-resectable	3	2
Cholangiocarcinoma of the Gallbladder	2	-
Cholangiocarcinoma Recurrent	2	1
Cholangiocarcinoma Resectable	1	-
Cholangiocarcinoma, Extrahepatic	1	-
Cholangiocarcinoma, Intrahepatic	4	1
Cholangiocarcinoma, Perihilar	1	-
Cholangiocarcinoma; Liver	1	-
Cholangiocellular Carcinoma	1	-
Cholangiocellular Carcinoma) (ICC)	1	-
Cholangiolar Carcinoma	2	-
Cholangitis, Sclerosing	1	1
Cholecystitis	2	1
Choledocholithiasis	3	1
Cholelithiasis	4	-
Cholera	1	-
Cholestasis	7	-

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