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Rare Diseases clinical trials in Philadelphia, PA

7 studies for Rare Diseases are looking for participants at sites in and around Philadelphia (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
• Washington, DC8 studies
• Cincinnati, OH5 studies
• Los Angeles, CA5 studies
• Columbus, OH4 studies
• New York City, NY3 studies
• Houston, TX3 studies
• Rochester, MN3 studies
• St. Louis, MO3 studies
• Seattle, WA3 studies
• Nashville, TN3 studies

Other studies in Philadelphia

• Cancer (all types)59 studies
• Breast Cancer56 studies
• Non-Small Cell Lung Cancer51 studies
• Metastatic Cancer46 studies
• Prostate Cancer44 studies
• Colorectal Cancer44 studies
• Ovarian Cancer44 studies
• Lung Cancer36 studies
• Acute Myeloid Leukemia34 studies
• Heart Failure31 studies
• Endometrial Cancer28 studies
• Depression26 studies

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