[1] Genentech Inc, San Francisco, CA 94080 USA
[2] Columbia Univ, New York, NY USA
[3] US Oncol Res, The Woodlands, TX USA
[4] Virginia Canc Specialists Res Inst, Fairfax, VA USA
[5] Fdn Med, Cambridge, MA USA
[6] Mem Sloan Kettering Canc Ctr, 1275 York Ave, New York, NY 10021 USA