[1] Natl Canc Ctr Hosp East, Dept Gastroenterol & Gastrointestinal Oncol, 6-5-1 Kashiwanoha, Kashiwa, Chiba 2778577, Japan
[2] Shizuoka Canc Ctr, Div Gastrointestinal Oncol, Shizuoka, Japan
[3] Japanese Fdn Canc Res, Dept Gastroenterol Canc, Inst Hosp, Tokyo, Japan
[4] Hokkaido Univ Hosp, Dept Canc Chemotherapy, Sapporo, Hokkaido, Japan
[5] Natl Hosp Org, Dept Gastrointestinal Med Oncol, Shikoku Canc Ctr, Matsuyama, Ehime, Japan
[6] Kumamoto Univ, Grad Sch Med Sci, Dept Gastroenterol Surg, Kumamoto, Japan
[7] Kochi Hlth Sci Ctr, Dept Clin Oncol, Kochi, Japan
[8] Kobe City Med Ctr Gen Hosp, Dept Clin Oncol, Kobe, Hyogo, Japan
[9] Tonan Hosp, Dept Med Oncol, Sapporo, Hokkaido, Japan
[10] Saitama Canc Ctr, Dept Gastroenterol, Ina, Saitama, Japan
[11] Osaka Int Canc Inst, Dept Med Oncol, Osaka, Japan
[12] Chiba Canc Ctr, Div Gastroenterol, Chiba, Japan
[13] Aichi Canc Ctr Hosp, Dept Clin Oncol, Nagoya, Aichi, Japan
[14] Univ Tokushima, Dept Gastroenterol & Oncol, Tokushima, Japan
[15] Natl Hosp Org, Dept Gastrointestinal & Med Oncol, Kyushu Canc Ctr, Fukuoka, Japan
[16] Tochigi Canc Ctr, Dept Chemotherapy, Utsunomiya, Tochigi, Japan
[17] Keio Univ, Dept Internal Med, Sch Med, Tokyo, Japan
[18] Univ Tsukuba, Div Gastroenterol, Tsukuba, Ibaraki, Japan
[19] Natl Canc Ctr, Gastrointestinal Oncol Div, Tokyo, Japan
[20] Osaka Med Coll Hosp, Canc Chemotherapy Ctr, Osaka, Japan
[21] Kanagawa Canc Ctr, Dept Gastroenterol, Yokohama, Kanagawa, Japan
[22] Jichi Med Univ Hosp, Dept Clin Oncol, Shimotsuke, Tochigi, Japan
[23] Taiho Pharmaceut Co Ltd, Tokyo, Japan