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Welcome to the NCI Dictionary of Cancer Terms, which contains more than 4,000 terms related to cancer and medicine. Type the word or phrase you are looking for in the Search box and click "Go". If you are not sure of the spelling, type in a few letters and click "Go". Or browse through the dictionary by clicking a letter in the alphabet.

The search is set up to find terms that start with the words or letters you type. Use "Contains" when you want to find all terms in the dictionary that include a word or set of letters. For example, typing "lung" and choosing "Contains" will find terms like "isolated lung perfusion" and "non-small cell lung cancer" in addition to terms that start with "lung" (e.g., "lung metastases").

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