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Rare Diseases clinical trials in Washington, DC

8 studies for Rare Diseases are looking for participants at sites in and around Washington (within about 30 miles). Open a study to see who can join and how to contact the study team.

Recruiting for a study here? Feature it at the top of this page — $99 for 30 days →

About Rare Diseases

A rare disease is one that affects fewer than 200,000 people in the United States. There are nearly 7,000, affecting more than 25 million Americans.

More about Rare Diseases on MedlinePlus

Rare Diseases trials in other cities

• Boston, MA9 studies
• Chicago, IL8 studies
• Philadelphia, PA7 studies
• Cincinnati, OH5 studies
• Los Angeles, CA5 studies
• Columbus, OH4 studies
• New York City, NY3 studies
• Houston, TX3 studies
• St. Louis, MO3 studies
• Seattle, WA3 studies
• Durham, NC3 studies
• Nashville, TN3 studies

Other studies in Washington

• Cancer (all types)58 studies
• Non-Small Cell Lung Cancer55 studies
• Breast Cancer46 studies
• Metastatic Cancer43 studies
• Lung Cancer41 studies
• Prostate Cancer38 studies
• Obesity33 studies
• Colorectal Cancer29 studies
• Cardiovascular Disease28 studies
• Bladder Cancer26 studies
• Acute Myeloid Leukemia24 studies
• Ovarian Cancer23 studies

From ClinicalTrials.gov, data retrieved Oct 6, 2026. Each study sets its own eligibility; the study team decides who can join.