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.

atypical hyperplasia
(AY-TIH-pih-kul HY-per-PLAY-zhuh)
A benign (not cancer) condition in which cells look abnormal under a microscope and are increased in number.