Efficacy and Safety of a Sunscreen Against Porfimer Sodium-induced Phototoxicity to Visible Light

Solar Protection Formula SPF® 60 (2 mg/cm²) will be topically applied on a randomly predetermined specific skin area on the back of each subject on four separate occasions over 3 months. The same skin area will never be exposed more than once to the sunscreen.

Photobiological testing will consist of exposing a small area of the sunscreen-protected and unprotected (control) skin areas to visible light on four separate occasions over 3 months. Light will be applied 30 minutes after application of the sunscreen. The same skin area will never be exposed more than once to light.