There are many reasons why people choose to join a clinical trial. Some join a trial because the treatments they have tried for their health condition did not work. Others participate because there is no treatment for their health problems. By being part of a clinical trial, participants may find out about new treatment options before they are widely available to the general public. Some studies are designed for, or include, people who are healthy, but want to help find ways to prevent a disease, such as one that may be common in their family.
It is important for clinical trials to have participants of different ages, sexes, races, and ethnicities. When research involves a group of people who are similar, the findings may not apply to or benefit everyone. When clinical trials include diverse participants, the study results may have a much wider applicability.