[1] Kansai Rosai Hosp, Amagasaki, Hyogo, Japan
[2] Natl Canc Ctr Hosp East, Off Clin Res Support, Kashiwa, Chiba, Japan
[3] Natl Canc Ctr, Gastrointestinal Med Oncol Div, Tokyo, Japan
[4] Saitama Canc Ctr Hosp, Dept Gastroenterol, Saitama, Japan
[5] Aichi Canc Ctr Hosp, Nagoya, Aichi, Japan
[6] St Marianna Univ, Dept Clin Oncol, Sch Med, Kawasaki, Kanagawa, Japan
[7] Chiba Canc Ctr, Dept Gastroenterol, Chiba, Japan
[8] Univ Tsukuba, Div Gastroenterol, Tsukuba, Ibaraki, Japan
[9] Kyushu Natl Canc Ctr, Fukuoka, Japan
[10] Hokkaido Univ Hosp, Dept Gastroenterol & Hepatol, Sapporo, Hokkaido, Japan
[11] Kyushu Univ, Fukuoka, Japan
[12] Shikoku Canc Ctr, Dept Gastrointestinal Med Oncol, Matsuyama, Ehime, Japan
[13] Osaka Univ, Grad Sch Med, Suita, Osaka, Japan
[14] Kyorin Univ, Dept Med Oncol, Sch Med, Tokyo, Japan
[15] Kinki Univ, Osaka, Japan
[16] Natl Canc Ctr, Exploratory Oncol Res & Clin Trial Ctr, Div Pathol, Chiba, Japan
[17] Natl Canc Ctr Hosp East, Chiba, Japan
[18] Natl Canc Ctr Hosp East, Kashiwa, Chiba, Japan
[19] Natl Canc Ctr Hosp East, Dept Gastrointestinal Oncol, Kashiwa, Chiba, Japan