[1] Natl Canc Ctr, Dept Hepatobiliary & Pancreat Oncol, Tokyo, Japan
[2] Kanagawa Canc Ctr Hosp, Div Hepatobiliary & Pancreat Oncol, Yokohama, Kanagawa, Japan
[3] Canc Inst Hosp JFCR, Tokyo, Japan
[4] Kyorin Univ, Dept Med Oncol, Tokyo, Japan
[5] Aichi Canc Ctr Hosp, Dept Gastroenterol, Nagoya, Aichi, Japan
[6] Saitama Canc Ctr, Dept Gastroenterol, Saitama, Japan
[7] Eisai & Co Ltd, Tokyo, Japan
[8] Eisai Inc, Woodcliff Lake, NJ USA
[9] Natl Canc Ctr Hosp East, Dept Hepatobiliary & Pancreat Oncol, Chiba, Japan