NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,922 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.

placebo therapy
(pluh-SEE-boh THAYR-uh-pee)
An inactive treatment or procedure that is intended to mimic as closely as possible a therapy in a clinical trial. Also called sham therapy.