Phase III trial
A clinical trial where the results of people taking a new treatment is compared with results of people taking standard treatment, for example, which group has better survival rates or fewer side effects. In most cases, studies move into phase III trials only after a treatment seems to work in Phases I and II. Phase III trials may include hundreds of people at many doctors' offices, clinics, and cancer centers nationwide. More information at Food and Drug Administration, protocol, double-blinded.
See Phase II trial, Phase IV trial.