NCI Dictionary of Cancer Terms

  • Resize font
  • Print
  • Email
  • Facebook
  • Twitter
  • Google+
  • Pinterest

The NCI Dictionary of Cancer Terms features 7,804 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.

post-marketing surveillance trial
(post-MAR-keh-ting ser-VAY-lents 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 phase IV trial.