SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 18, 1996 XYTRONYX, INC. ----------------------------------------- (Exact name of registrant as specified in its charter) DELAWARE -------------------------- (State or other jurisdiction of incorporation 0-14838 36-3258753 ------------------------- ------------------------------ (Commissioner File Number) (IRS Employer Identification Number) 6555 Nancy Ridge Drive Suite 200 San Diego, California 92121 ----------------------------------- (Address of principal executive offices) (Zip Code) Registrant's telephone number, including area code: (619) 550-3900 Item 5. OTHER EVENTS. The News Release dated March 18, 1996 regarding completion of the U.S. clinical studies of its Periodontal Tissue Monitor, filed as Exhibit 99.48 hereto, is hereby incorporated into this Report by reference. Item 7. Financial Statements, Pro Forma Financial Information and Exhibits. (c) EXHIBITS. The following exhibit accompanies this Report: EXHIBIT NUMBER EXHIBIT DESCRIPTION 99.48 News Release dated March 18, 1996 regarding completion of the U.S. clinical studies of its Periodontal Tissue Monitor. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. XYTRONYX, INC. By: /s/ DALE SANDER --------------------------- Dale Sander Chief Financial Officer Date: March 22, 1996 2 INDEX TO EXHIBITS EXHIBIT SEQUENTIALLY NUMBER DESCRIPTION OF EXHIBIT NUMBERED PAGE 99.48 News Release dated March 18, 1996 regarding completion of the U.S. clinical studies of its Periodontal Tissue Monitor. 3 FOR IMMEDIATE RELEASE CONTACT: Dale A. Sander, Chief Financial Officer Larry O. Bymaster, Chief Executive Officer (619) 550-3900 ------------------------------------------------------------------------------ XYTRONYX, INC. ANNOUNCES COMPLETION OF CLINICAL STUDIES FOR PERIODONTAL TISSUE MONITOR SAN DIEGO, CA, March 18, 1996 -- Xytronyx, Inc. (AMEX: XYX) today announced that it has completed the U.S. clinical studies of its Periodontal Tissue Monitor (the "PTM"). Xytronyx stated that it has begun the process of summarizing and evaluating the data from the clinical studies, and will include the data and other required information in a Premarket Application expected to be filed with the U.S. Food and Drug Administration by mid-year. The PTM is designed to assist periodontists and dentists with the evaluation and monitoring the effectiveness of treatment of periodontitis, a serious form of gum disease. The U.S. clinical studies involved testing a total of approximately 175 patients and control subjects with the PTM over a 12-month period. The studies were performed at three universities, Harvard University, the University of North Carolina, and the University of Washington. 4