Understanding Clinical Trials as a Patient

Clinical trials test new treatments, drugs, and medical devices before they're available to the general public. ClinicalTrials.gov, run by the National Library of Medicine, lists over 500,000 registered studies including more than 160,000 with U.S. locations. Despite that, only 5 to 8% of adult cancer patients participate in trials. For non-cancer conditions, the rate is even lower.

The Four Phases

Phase I tests safety in 20 to 100 volunteers. Phase II tests whether the treatment works in 100 to 300 people. Phase III confirms results in 1,000 to 3,000+ participants and compares the treatment to existing options. Phase IV monitors the treatment after it's approved and on the market. Most trial participants join Phase II or III studies.

Your Protections

Federal regulations (45 CFR 46, the Common Rule) require informed consent, Institutional Review Board oversight, and the right to withdraw at any time without penalty. The FDA requires diversity action plans for trials as of 2024 to ensure participants reflect the population that will use the treatment. You should receive a detailed consent form explaining risks, benefits, what's expected of you, and who to contact with questions.

How to Find a Trial

Search ClinicalTrials.gov by condition, treatment, and location. Ask your doctor if any trials are relevant to your condition. Major cancer centers and academic medical centers run the most trials. The 21st Century Cures Act expanded decentralized trial options, meaning some trials let you participate remotely without frequent travel to a trial site.

Cost

The study drug or device is typically free. Routine care costs (doctor visits, lab tests) during the trial are usually covered by your insurance. Some trials cover travel expenses. Read the financial section of the consent form carefully so you know what costs you're responsible for.