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.

2,956 conditions starting with "C"

Showing 2,901–2,950 of 2,956

Condition	Trials	Recruiting
CYP2C19 Polymorphism	1	1
CYP2D6 Polymorphism	2	-
CYP3A4 Protein, Human	1	-
Cyst of Pancreas	1	1
Cystadenoma, Mucinous	1	-
Cystectomy	4	3
Cystic Fibrosis	170	49
Cystic Fibrosis (CF)	15	13
Cystic Fibrosis - Complete	2	1
Cystic Fibrosis in Children	7	5
Cystic Fibrosis Liver Disease	1	-
Cystic Fibrosis Lung	2	2
Cystic Fibrosis Pulmonary Exacerbation	2	2
Cystic Fibrosis With Intestinal Manifestations	2	1
Cystic Fibrosis, Homozygous for the F508del CFTR Mutation	1	-
Cystic Fibrosis, Homozygous or Heterozygous for the F508del-CFTR Mutation	1	-
Cystic Fibrosis-related Diabetes	11	8
Cystic Nephroma	2	2
Cystic Partially Differentiated Kidney Nephroblastoma	1	-
Cystic, Mucinous and/or Serous Neoplasm	1	-
Cysticercosis	2	1
Cystinosis	5	2
Cystinuria	5	3
Cystitis	3	-
Cystitis Chronic	1	1
Cystitis Recurrent	1	1
Cystitis, Chronic Interstitial	1	1
Cystitis, Interstitial	3	2
Cystitis;Puerperium	1	-
Cystocele	1	-
Cystoid Macular Edema	3	1
Cystoid Macular Edema, Postoperative	1	-
Cystoscopy	2	-
Cysts	1	-
CYTALUX (Pafolacianine) Injection	1	1
Cytochrome P-450 CYP2D6	1	-
Cytochrome P450 CYP2C19 Enzyme Deficiency	1	-
Cytochrome P450 CYP2C9 Enzyme Deficiency	1	-
Cytochrome P450 CYP2D6 Enzyme Deficiency	1	-
Cytogenetic Abnormality	1	1
Cytokine	1	-
Cytokine Release Syndrome	4	3
Cytomegaloviral Infection	4	2
Cytomegalovirus	6	3
Cytomegalovirus (CMV)	2	2
Cytomegalovirus (CMV) Infection	1	-
Cytomegalovirus Cell Mediated Immunity	1	1
Cytomegalovirus Congenital	1	-
Cytomegalovirus Disease	1	-
Cytomegalovirus Infection	6	2

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