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Definition of Photodynamic therapy

Photodynamic therapy: A form of cancer treatment using an photosensitizing agent administered intravenously which concentrates selectively in tumor cells, followed by exposure of the tumor tissue to a special red laser light, in order to destroy as much of the tumor as possible.

Photodynamic therapy is also called, descriptively, photochemotherapy.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=4881
Last Editorial Review: 8/30/2002

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