DUSA Pharmaceuticals, Inc. (NASDAQ GM: DUSA) announces that its first quarter 2011 corporate highlights and financial results press release will be issued on Thursday, May 5 th at 6:30 a.m. to be followed by a conference call and audio webcast at 8:30 a.m. Conference call dial in and webcast log in details are as follows: Thursday, May 5 th - 8:30 a.m. E.D.T.North American callers dial:877-645-6210International callers dial:970-315-0447Participant Conference ID: 63830923 To access the call online via webcast, please click here, or visit http://bit.ly/ioG9Oa. A telephone replay will be available shortly after the live call concludes. To access the replay, dial 800-642-1687 (North American callers) or 706-645-9291 (International callers). The telephone replay and webcast will also be accessible on the investors section of our website approximately six hours following the call at www.dusapharma.com. About DUSA Pharmaceuticals DUSA Pharmaceuticals, Inc. is an integrated dermatology pharmaceutical company focused primarily on the development and marketing of its Levulan ® PDT technology platform, and other dermatology products. Levulan ® Kerastick ® for topical solution plus DUSA’s BLU-U ® blue light photodynamic therapy illuminator is currently approved for the treatment of minimally to moderately thick actinic keratoses (AKs) of the face or scalp. DUSA also markets other dermatology products, including ClindaReach ®. DUSA is based in Wilmington, Mass. Please visit our website at www.dusapharma.com.