[1] Natl Canc Ctr, Hepatobiliary & Pancreat Oncol Div, Tokyo, Japan
[2] Osaka Med Ctr Canc & Cardiovasc Dis, Div Hepatobiliary & Pancreat Oncol, Osaka, Japan
[3] Kanagawa Canc Ctr, Div Gastroenterol, Kawasaki, Kanagawa, Japan
[4] Natl Canc Ctr Hosp East, Div Hepatobiliary & Pancreat Oncol, Chiba, Japan
[5] Saitama Canc Ctr, Dept Gastroenterol, Saitama, Japan
[6] Kochi Hlth Sci Ctr, Dept Clin Oncol, Kochi, Japan
[7] Niigata Canc Ctr Hosp, Div Surg, Niigata, Japan
[8] Natl Canc Ctr, Div Genet, Tokyo, Japan
[9] Chiba Univ Hosp, Clin Res Ctr, Chiba, Japan