[1] Aichi Canc Ctr Hosp, Dept Gastroenterol, Nagoya, Aichi 464, Japan
[2] Univ Manchester, Manchester Acad Hlth Sci Ctr, Dept Med Oncol, Christie NHS Fdn Trust, Manchester, Lancs, England
[3] Kyorin Univ, Sch Med, Dept Internal Med, Tokyo, Japan
[4] UCL Canc Trials Ctr, Canc Res UK Inst Canc Studies, London, England
[5] Imperial Coll Hlth Care Trust, Hammersmith Hosp, Dept Canc Med, London, England
[6] UCL, Inst Canc, London, England
[7] Natl Canc Ctr, Hepatobiliary & Pancreat Oncol Div, Tokyo, Japan