NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,506 terms related to cancer and medicine.
We offer a widget that you can add to your website to let users look up cancer-related terms. Get NCI’s Dictionary of Cancer Terms Widget.
- phase IV clinical trial
- listen (fayz … KLIH-nih-kul TRY-ul)
- A type of clinical trial that studies the side effects caused over time by a new treatment after it has been approved and is on the market. These trials look for side effects that were not seen in earlier trials and may also study how well a new treatment works over a long period of time. Phase IV clinical trials may include thousands of people. Also called phase 4 clinical trial and post-marketing surveillance trial.