[1] Dana Farber Canc Inst, Boston, MA 02115 USA
[2] Univ Hosp Leuven, Leuven, Belgium
[3] Taiho Pharmaceut Co Ltd, Tokyo, Japan
[4] Kyushu Univ, Fukuoka 812, Japan
[5] Natl Canc Ctr Hosp East, Kashiwa, Chiba, Japan
[6] Univ So Calif, Norris Comprehens Canc Ctr, Los Angeles, CA USA