NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,855 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.

hyperplasia
(HY-per-PLAY-zhuh)
An increase in the number of cells in an organ or tissue. These cells appear normal under a microscope. They are not cancer, but may become cancer.