[1] Johns Hopkins Univ, Sch Med, Baltimore, MD USA
[2] Comprehens Canc Ctr Nevada, Las Vegas, NV USA
[3] Ctr Leon Berard, F-69373 Lyon, France
[4] Inst Claudius Regaud, Toulouse, France
[5] Yale Univ, Sch Med, New Haven, CT USA
[6] Genentech Inc, San Francisco, CA 94080 USA
[7] Dana Farber Canc Inst, Boston, MA 02115 USA