NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 7,790 terms related to cancer and medicine.
Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.
- phase IV trial
- listen (fayz … TRY-ul)
- A type of clinical trial that studies the side effects of a treatment after it has been approved and is being marketed. These trials include thousands of people and look for side effects that were not seen in earlier trials. Also called post-marketing surveillance trial.