No. 95-1247 DECIDED October 25, 1996 D. Dennis Allegretti, Banner Allegretti, Boston, MA, argued, for plaintiff-appellee. With him on the brief, were Dale A. Malone and John P. Iwanicki. Also on the brief, were Lloyd R. Day, Jr., David M. Madrid, and Robert M. Galvin, Cooley Godward Castro Huddleson Tatum, Palo Alto, CA, and Steven M. Odre and Stuart L. Watt, Amgen, Inc., Thousand Oaks, California. David F. Dobbins, Patterson, Belknap, Webb Tyler, L.L.P., New York City, argued, for plaintiffs-appellees