2026 data ClinicalTrials.gov official source

Conditions: O

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

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

829 conditions starting with "O"

Showing 701–750 of 829

Condition	Trials	Recruiting
Ovarian Cancer (OvCa)	1	1
Ovarian Cancer Metastatic	1	1
Ovarian Cancer Metastatic Recurrent	1	1
Ovarian Cancer Recurrent	5	3
Ovarian Cancer Stage 1	1	1
Ovarian Cancer Stage 3	1	1
Ovarian Cancer Stage II	1	1
Ovarian Cancer Stage III	3	3
Ovarian Cancer Stage IIIC	1	1
Ovarian Cancer Stage IV	3	3
Ovarian Cancer, Epithelial	1	1
Ovarian Cancer, Ovarian Neoplasms	1	-
Ovarian Carcinoma	36	22
Ovarian Carcinoma, Recurrent	1	1
Ovarian Carcinosarcoma	3	2
Ovarian Clear Cell Adenocarcinofibroma	2	-
Ovarian Clear Cell Adenocarcinoma	8	3
Ovarian Clear Cell Carcinoma	5	3
Ovarian Clear Cell Cystadenocarcinoma	5	-
Ovarian Clear Cell Tumor	1	-
Ovarian Cysts	1	-
Ovarian Diseases	1	-
Ovarian Disfunction	1	1
Ovarian Embryonal Carcinoma	1	-
Ovarian Endometrioid Adenocarcinoma	16	3
Ovarian Endometrioid Tumor	3	-
Ovarian Epithelial Cancer	1	-
Ovarian Epithelial Carcinoma	2	1
Ovarian Failure	1	-
Ovarian Failure, Premature	1	-
Ovarian Function Insufficiency	1	-
Ovarian Germ Cell Tumor	5	2
Ovarian High Grade Endometrioid Adenocarcinoma	2	1
Ovarian High Grade Serous Adenocarcinoma	11	2
Ovarian Lesion	1	1
Ovarian Low Grade Serous Adenocarcinoma	2	-
Ovarian Malignant Mixed Mesodermal (Mullerian) Tumor	1	-
Ovarian Mass	1	-
Ovarian Mixed Epithelial Carcinoma	2	-
Ovarian Mixed Germ Cell Tumor	1	-
Ovarian Mucinous Adenocarcinoma	4	1
Ovarian Mucinous Cystadenocarcinoma	5	-
Ovarian Neoplasm	8	1
Ovarian Neoplasms	39	16
Ovarian Reserve	1	1
Ovarian Sarcoma	4	-
Ovarian Seromucinous Carcinoma	6	-
Ovarian Serous Adenocarcinoma	9	3
Ovarian Serous Cystadenocarcinoma	5	-
Ovarian Serous Surface Papillary Adenocarcinoma	2	-

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