[1] Natl Canc Ctr Hosp East, Dept Hepatobiliary & Pancreat Oncol, Chiba, Japan
[2] Toranomon Gen Hosp, Tokyo, Japan
[3] Kinki Univ, Sch Med, Osakasayama, Osaka, Japan
[4] Osaka Red Cross Hosp, Dept Gastroenterol & Hepatol, Osaka, Japan
[5] Natl Canc Ctr, Dept Hepatobiliary & Pancreat Oncol, Tokyo, Japan
[6] Eisai & Co Ltd, Tokyo, Japan
[7] Shunan Mem Hosp, Kudamatsu, Japan