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.

anaplastic thyroid cancer
(A-nuh-PLAS-tik THY-royd KAN-ser)
A rare, aggressive type of thyroid cancer in which the malignant (cancer) cells look very different from normal thyroid cells.