NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 8,123 terms related to cancer and medicine.

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biological agent
(BY-oh-LAH-jih-kul AY-jent)
A substance that is made from a living organism or its products and is used in the prevention, diagnosis, or treatment of cancer and other diseases. Biological agents include antibodies, interleukins, and vaccines. Also called biologic agent and biological drug.