Where do clinical trials take place?

Clinical trials take place in doctors’ offices, cancer centers, other medical centers, community hospitals and clinics, and veterans’ and military hospitals in cities and towns across the United States and in other countries. Clinical trials may include participants at one or two highly specialized centers, or they may involve hundreds of locations at the same time.

Source: https://www.cancer.gov/about-cancer/treatment/clinical-trials/what-are-trials/where