1 EXHIBIT 1 UNDERWRITING AGREEMENT [October __, 2000] Robertson Stephens, Inc. Lehman Brothers Inc. Prudential Securities Incorporated Lazard Freres & Co. LLC Adams, Harkness & Hill, Inc. As Representatives of the several Underwriters c/o FleetBoston...Underwriting Agreement • September 29th, 2000 • Osi Pharmaceuticals Inc • In vitro & in vivo diagnostic substances • New York
