People decide to be part of a cancer prevention clinical trial for many reasons.
Also, because study participants get regular and careful medical attention, some health problems may be found early. Some people feel good about contributing to medical knowledge. If the study agent turns out to be effective against cancer, it may help others. For example, prevention trials showed that aspirin helps prevent heart attacks, and now many people take aspirin daily on their doctor's advice. You need to weigh the possible benefits and possible risks for yourself.