2026 data ClinicalTrials.gov official source

Conditions: R

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

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

1,694 conditions starting with "R"

Showing 701–750 of 1,694

Condition	Trials	Recruiting
Recurrent, CNS Tumor, Childhood	1	-
Recurrent, Refractory, or High Risk Leukemias	1	-
Recurrent/Metastatic Head and Neck Squamous Cell Carcinoma (R/M HNSCC)	1	1
Recurrent/Metastatic Squamous Cell Carcinoma of the Head and Neck (HNSCC)	1	-
Recurrent/Refractory Secondary Central Nervous System Lymphoma	1	-
Red Blood Cell Survival	1	-
Red Blood Cell Transfusion	1	-
Red Cell Membrane and Enzyme Abnormalities	1	-
Red Tide	2	2
Red-Cell Aplasia, Pure	1	-
Reduced Pain Response	1	-
Reduced Physical Activity	1	-
Reduced Ventricular Ejection Fraction	1	-
Reducing Excess Blood Transfusion	1	-
Reducing Pain With Nexplanon Implant Insertion	1	1
Reducing Time to Vaginal Delivery	1	-
Reduction in Severity of Skin Scarring	1	-
Reduction of Substance Use-related Stigma	1	1
Reduction, Weight	1	-
Referred Pain	1	1
Reflex Syncope	1	-
Reflux	3	2
Reflux Esophagitis	1	-
Reflux, Gastroesophageal	1	-
Refractive Ametropia	6	-
Refractive Error	6	1
Refractive Error - Myopia	1	1
Refractive Error - Myopia Severe	1	-
Refractive Error - Myopia Simple	1	-
Refractive Errors	15	2
Refractive Lens Exchange	1	-
Refractive Surgery	3	2
Refractory	5	2
Refractory Acute Biphenotypic Leukemia	2	1
Refractory Acute Leukemia	4	3
Refractory Acute Leukemia of Ambiguous Lineage	3	1
Refractory Acute Lymphoblastic Leukemia	22	12
Refractory Acute Lymphoblastic Leukemia (ALL)	2	1
Refractory Acute Lymphoid Leukemia in Relapse	1	1
Refractory Acute Myelogenous Leukemia (AML)	1	-
Refractory Acute Myeloid Leukemia	64	36
Refractory Acute Myeloid Leukemia (AML)	2	-
Refractory Acute Myeloid Leukemia Due to Lineage Switch From Acute Leukemia of Ambiguous Lineage	1	-
Refractory Acute Myeloid Leukemia Due to Lineage Switch From B Acute Lymphoblastic Leukemia, KMT2A-Rearranged	1	-
Refractory Acute Undifferentiated Leukemia	2	2
Refractory Adult Acute Lymphoblastic Leukemia	2	1
Refractory Adult T-Cell Leukemia/Lymphoma	1	1
Refractory Aggressive B-cell Lymphomas	1	-
Refractory Aggressive Non-Hodgkin Lymphoma	1	-
Refractory AL Amyloidosis	3	2

Browse all → | Rankings →

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

Related