photodynamic therapyListen to pronunciation(FOH-toh-dy-NA-mik THAYR-uh-pee)Treatment with drugs that become active when exposed to light. These activated drugs may kill cancer cells.More InformationPhotodynamic Therapy to Treat CancerSearch NCI's Dictionary of Cancer TermsStarts withContainsBrowse:ABCDEFGHIJKLMNOPQRSTUVWXYZ#