NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,777 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.

TSNA
A type of harmful, cancer-causing chemical found in tobacco and tobacco smoke. TSNAs are formed when tobacco leaves are grown, cured, aged, and processed. Tobacco products can contain different amounts of TSNAs, depending on how they are made. Also called tobacco-specific nitrosamine.