NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,790 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.

amelanotic melanoma
(AY-meh-luh-NAH-tik MEH-luh-NOH-muh)
A type of skin cancer in which the cells do not make the pigment melanin. Skin lesions are often irregular and may be pink, red, or have light brown, tan, or gray at the edges.