MELVILLE, N.Y.--(BUSINESS WIRE)--OSI Pharmaceuticals, Inc. (the “Company”) announced today that its 2% Convertible Senior Subordinated Notes due 2025 (the “notes”) are convertible at the option of the holders and will remain convertible at least through July 8, 2010, as provided for in the Indenture (the “Indenture”) governing the notes.