2026 data ClinicalTrials.gov official source

Conditions: C

Compiled by PlainTrial · January 1, 2026

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

2,928 conditions starting with "C"

Showing 1,801–1,850 of 2,928

Condition	Trials	Recruiting
Clinical Stage: Stage II (T3-4, N-)	1	1
Clinical Trial	2	1
Clinically Indicated MR Imaging	1	-
Clinically Isolated Syndrome	6	3
Clinically Node-Negative (cN0)	1	1
Clinically Severe Obesity	1	-
Clinically Significant Portal Hypertension	1	-
Clinician Acceptability of New NPWT Drape	1	1
Clinician Burnout	1	-
Clinician Experience	1	-
Clival Chordoma	1	-
CLL	9	3
CLL (Chronic Lymphocytic Leukemia)	6	4
CLL Variant	1	1
CLL/SLL	7	6
CLN2 Disease	1	-
CLN2 Disorder	1	-
CLN3	1	-
CLN6	2	-
CLN7	1	-
Clonal Cytopenia of Undetermined Significance	12	10
Clonal Expansion	1	1
Clonal Hematopoiesis	4	4
Clonal Hematopoiesis of Indeterminate Potential	3	3
Clonal Hematopoiesis of Indeterminate Potential (CHIP)	1	-
Clonal Mast Cell Disease	1	1
Clonal Myeloid Neoplasm	1	-
Closed Femur Fracture	1	-
Closed Head Injury	2	-
Clostridia Difficile Colitis	1	1
Clostridiodies Difficile Infections	1	1
Clostridioides Difficile Associated Disease	1	1
Clostridioides Difficile Infection	7	5
Clostridioides Difficile Infection Recurrence	2	2
Clostridium Difficile	7	2
Clostridium Difficile Associated Disease	3	-
Clostridium Difficile Colitis	2	1
Clostridium Difficile Diarrhea	1	1
Clostridium Difficile Immunisation	1	-
Clostridium Difficile Infection	14	5
Clostridium Difficile Infection (CDI)	1	-
Clostridium Difficile Infection Recurrence	3	2
Clostridium Difficile Infections	1	1
Clostridium Infection	1	-
Clostridium Infections	1	-
Clostridium Perfringens	1	-
Clostridium Sordellii	1	-
Clostridium; Botulinum	1	1
Clostridoides Difficile Associated Disease	1	-
Clot Blood	1	1

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