DUSA Pharmaceuticals, Inc.® (NASDAQ GM: DUSA), announced today that it has filed lawsuits against physicians in California, Florida and Ohio, alleging infringement of patents exclusively licensed to DUSA. Additionally, a suit has been filed against a chemical supplier of aminolevulinic acid (ALA) in Arizona. The patents asserted in the lawsuits cover the use of compounds such as ALA with photodynamic therapy (PDT) to treat actinic keratosis, basal cell carcinoma, acne and other dermatological conditions.
