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Photodynamic Therapy

Two photons are better than one

Nature Photonics volume 2, pages 394395 (2008) | Download Citation


Over the past 20 years photodynamic therapy, a cell-killing technique where a photosensitizing drug is activated by carefully targeted visible light, has led to new therapies for cancer and other diseases. In doing so it has won support from scientists, clinicians and patients alike.

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Author information


  1. Stanley Brown is at the Centre for Photobiology and Photodynamic Therapy in the Faculty of Biological Sciences at the University of Leeds, Leeds, LS2 9JT, UK.

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Competing interests

Stanley Brown is employed by Photopharmica, a small company developing photodynamic therapy for infection. The company has no current or planned interests in two-photon photodynamic therapy.

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