DUSA SUES PHYSICIANS FOR INFRINGEMENT OF ITS LEVULAN'R' PHOTODYNAMIC THERAPY PATENTS

DUSA Pharmaceuticals, Inc. announced today it has filed lawsuits against physicians in California, Florida, and Tennessee to prevent their continued use of versions of its Levulan brand of aminolevulinic acid HCl (ALA) produced by compounding pharmacies, for use in the company's patented photodynamic therapy (PDT) treatment for actinic keratosis, basal cell carcinoma, acne and other dermatological conditions.

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