[1] Chiba Canc Ctr, Clin Trial Promot Dept, Chiba, Japan
[2] Aichi Canc Ctr Hosp, Nagoya, Aichi, Japan
[3] St Marianna Univ, Sch Med, Dept Clin Oncol, Kawasaki, Kanagawa, Japan
[4] Natl Hosp Org Shikoku Canc Ctr, Matsuyama, Ehime, Japan
[5] Yokohama City Univ, Sch Med, Yokohama, Kanagawa, Japan
[6] Canc Ctr Hosp, Dept Clin Oncol, Nagoya, Aichi, Japan
[7] USC Keck Sch Med, Norris Comprehens Canc Ctr, Los Angeles, CA USA
[8] Natl Hosp Org Shikoku Canc Ctr, Dept Gastrointestinal Med Oncol, Matsuyama, Ehime, Japan
[9] Keio Univ, Sch Med, Tokyo, Japan