NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,926 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.

prophylactic cranial irradiation
(PROH-fih-LAK-tik KRAY-nee-ul ir-RAY-dee-AY-shun)
Radiation therapy to the head to reduce the risk that cancer will spread to the brain.