A step in the overall clinical research process to test a new drug, device, or treatment.
How to say: Phase
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Phases of research studies build on each other. Each phase has a separate goal.
Phase 1 studies are often the first to enroll humans and test for safety.
Phase 2 studies test if the drug, device or treatment works.
Phase 3 studies compare the study treatment to the usual, standard treatment.
Phase 4 studies continue to collect data after a study treatment is approved. These are sometimes called post-marketing studies.