WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 April 26, 2004 -------------- Date of Report (Date of earliest event reported) OSI PHARMACEUTICALS, INC. ------------------------- (Exact name of registrant as specified in its charter) DELAWARE 0-15190 13-3159796 --------- ------- ---------- (State or other jurisdiction of (Commission (I.R.S. Employer incorporation) File Number) Identification No.) 58 SOUTH SERVICE ROAD MELVILLE, NY 11747 --------------------------- (Address of principal executive offices) (631) 962-2000 ----------------------- (Registrant's telephone number, including area code) N/A --------------- (Former name or former address, if changed since last report.) ITEM 5. OTHER EVENTS On April 26, 2004, OSI Pharmaceuticals, Inc., a Delaware corporation (the "Company") announced certain results from a non-small cell lung cancer Phase III study of Tarceva(TM). Details regarding the results are contained in the Company's press release, dated April 26, 2004, attached as Exhibit 99, and incorporated herein by reference. ITEM 7. EXHIBITS EXHIBIT NO. DESCRIPTION 99 Press release, dated April 26, 2004. SIGNATURE 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. Date: April 26, 2004 OSI PHARMACEUTICALS, INC. By: /s/ Robert L. Van Nostrand ------------------------------------- Robert L. Van Nostrand Vice President and Chief Financial Officer (Principal Financial Officer) EXHIBIT INDEX EXHIBIT NO. DESCRIPTION 99 Press release, dated April 26, 2004.