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Home >Information for Patients > Dictionary Index

Dictionary of Cancer Terms

View in Spanish: Fotoactividad

Photoactivity (FOH-toh-ak-TIH-vih-tee)
The effect produced when certain substances are exposed to light. In cancer treatment, some drugs become active when exposed to light and are then able to kill tumor cells.

Source: National Cancer Institute Dictionary of Cancer Terms, available at www.cancer.gov/dictionary.