NCI Dictionary of Cancer Terms

The NCI Dictionary of Cancer Terms features 8,614 terms related to cancer and medicine.

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A condition in which abnormal cells are found on the surface of or in the tissue that lines an organ, such as the prostate, breast, or cervix. The changes in the cells may be low grade or high grade, depending on how much of the tissue is affected and how abnormal the cells look under a microscope. Sometimes, the abnormal cells may become cancer and spread to nearby normal tissue. Also called intraepithelial neoplasia.