NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,899 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.

complement protein
(KOM-pleh-ment PROH-teen)
One of a group of about 20 proteins that is found in the blood and is important in fighting infections and other diseases.