[1] Dana Farber Canc Inst, Dept Med Oncol, Boston, MA 02115 USA
[2] Massachusetts Gen Hosp, Boston, MA 02114 USA
[3] Oregon Hlth & Sci Univ, Inst Canc, Portland, OR 97201 USA
[4] Ohio State Univ, Ctr Comprehens Canc, Columbus, OH 43210 USA
[5] Wake Forest Univ, Ctr Comprehens Canc, Winston Salem, NC 27109 USA
[6] Millennium Pharmaceut Inc, Cambridge, MA USA