NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,894 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.

pernicious anemia
(per-NIH-shus uh-NEE-mee-uh)
A type of anemia (low red blood cell count) caused by the body's inability to absorb vitamin B12.