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.

4-nitroquinoline 1-oxide
(4-NY-troh-KWIH-noh-leen 1-OK-side)
A substance that is used in cancer research to cause tumors in laboratory animals. This is done to test new diets, drugs, and procedures for use in cancer prevention and treatment. Also called 4-NQO.