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) MAY 20, 1996 ENZON, INC. (Exact name of registrant as specified in its charter) DELAWARE 0-12957 22-237286 (State or other jurisdiction (Commission (IRS Employer of incorporation) File Number) Identification) 20 KINGSBRIDGE ROAD, PISCATAWAY, NEW JERSEY 08854 (Address of principal executive offices) (Zip Code) Registrant's telephone number, including area code (908) 980-4500 (Former name or former address, if changed since last report)ITEM 5. OTHER EVENTS Enzon, Inc. ("Enzon" or the "Company") completed its Phase Ia clinical trial in healthy volunteers at the end of 1995, and received approval from the FDA to enter a multi-dose trial in cancer patients. Enrollment of patients for this trial has been unexpectedly slow, and as a result, the Company has just opened a second site and plans to add additional sites. The clinical supplies for the trial have been delivered to the open sites. To expedite completion of this trial, a clinical research organization will be utilized to accelerate patient recruitment, monitor the study, and compile results. 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. Dated: May 29, 1996 ENZON, INC. (Registrant) By: /s/KENNETH J. ZUERBLIS Kenneth J. Zuerblis Vice President, Finance and Chief Financial Officer