[1] Harvard Univ, Massachusetts Gen Hosp, Sch Med, Ctr Canc, Boston, MA USA
[2] Univ Calif Los Angeles, Los Angeles, CA USA
[3] Northwestern Univ, Feinberg Sch Med, Chicago, IL 60611 USA
[4] East Jefferson Gen Hosp, Metairie, LA USA
[5] Univ Penn, Abramson Canc Ctr, Philadelphia, PA 19104 USA
[6] ImClone Syst, Branchburg, NJ USA
[7] Tufts Univ, Sch Med, Lahey Clin Med Ctr, Burlington, MA USA