NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,847 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.

photodynamic therapy
(FOH-toh-dy-NA-mik THAYR-uh-pee)
Treatment with drugs that become active when exposed to light. These activated drugs may kill cancer cells.