a study which aims to generate statistically relevant data about a drug. It can be multicentre, and usually involves thousands of volunteers who are randomly given either control or study therapy.
A human trial, often involving more patients than a phase II trial, to confirm a drug's efficacy, compare it to commonly-used therapies and generate long-term safety data.
Clinical trial conducted to compare the new cancer treatment to the standard (accepted) treatment to discover which treatment is more effective. Phase III trials involve large numbers of patients who are assigned at random to receive the either the new treatment or the standard treatment. In most cases, studies move into phase III only after a treatment seems to work in phases I and II.