NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 8,128 terms related to cancer and medicine.

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actinic keratosis
(ak-TIH-nik KAYR-uh-TOH-sis)
A thick, scaly patch of skin that may become cancer. It usually forms on areas exposed to the sun, such as the face, scalp, back of the hands, or chest. It is most common in people with fair skin. Also called senile keratosis and solar keratosis.