NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 8,177 terms related to cancer and medicine.

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hematoporphyrin derivative
(HEE-muh-toh-POR-fih-rin deh-RIH-vuh-tiv)
A drug used in photodynamic therapy that is absorbed by tumor cells. When exposed to light, it becomes active and kills the cancer cells.