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 1,801–1,850 of 2,954

Condition	Trials	Recruiting
Clinical Stage IV Gastroesophageal Junction Adenocarcinoma	1	1
Clinical Stage IV Gastroesophageal Junction Adenocarcinoma AJCC v8	15	9
Clinical Stage IV HPV-Mediated (p16-Positive) Oropharyngeal Carcinoma AJCC v8	9	5
Clinical Stage IV Merkel Cell Carcinoma AJCC v8	1	-
Clinical Stage IVA Esophageal Adenocarcinoma AJCC v8	5	1
Clinical Stage IVA Esophageal Squamous Cell Carcinoma AJCC v8	2	-
Clinical Stage IVA Gastric Cancer AJCC v8	10	3
Clinical Stage IVA Gastroesophageal Junction Adenocarcinoma	1	1
Clinical Stage IVA Gastroesophageal Junction Adenocarcinoma AJCC v8	9	3
Clinical Stage IVB Esophageal Adenocarcinoma AJCC v8	4	-
Clinical Stage IVB Esophageal Squamous Cell Carcinoma AJCC v8	1	-
Clinical Stage IVB Gastric Cancer AJCC v8	8	4
Clinical Stage IVB Gastroesophageal Junction Adenocarcinoma A	1	1
Clinical Stage IVB Gastroesophageal Junction Adenocarcinoma AJCC v8	5	3
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 / SLL	1	1
CLL Variant	1	1
CLL/SLL	6	5
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

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

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