[1] Natl Canc Ctr, Div Gastrointestinal Oncol, Tokyo, Japan
[2] Hyogo Canc Ctr, Dept Gastrointestinal Oncol, Akashi, Hyogo, Japan
[3] Natl Hosp Org Kyushu Canc Ctr, Dept Gastrointestinal & Med Oncol, Fukuoka, Fukuoka, Japan
[4] Kochi Hlth Sci Ctr, Dept Gastroenterol, Kochi, Japan
[5] Japan Community Healthcare Org Kyushu Hosp, Dept Hematol Oncol, Kitakyushu, Fukuoka, Japan
[6] Keiyukai Sapporo Hosp, Dept Med Oncol, Sapporo, Hokkaido, Japan
[7] Oita Univ, Dept Med Oncol & Hematol, Fac Med, Oita, Japan
[8] St Marianna Univ, Sch Med, Dept Clin Oncol, Kawasaki, Kanagawa, Japan
[9] Chiba Canc Ctr, Clin Trial Promot Dept, Chiba, Japan