[1] Natl Canc Ctr Hosp East, Kashiwa, Chiba, Japan
[2] Tisch Canc Inst Mt Sinai, New York, NY USA
[3] Kindai Univ, Sch Med, Dept Gastroenterol & Hepatol, Osaka, Japan
[4] Toranomon Gen Hosp, Tokyo, Japan
[5] Calif Pacif Med Ctr Res Inst, San Francisco, CA USA
[6] Univ Calif Los Angeles, Los Angeles, CA 90024 USA
[7] Kanazawa Univ Hosp, Kanazawa, Ishikawa 9201192, Japan
[8] Harvard Med Sch, Massachusetts Gen Hosp, Ctr Canc, Boston, MA 02114 USA
[9] Eisai & Co Ltd, Tokyo, Japan
[10] Eisai Ltd, Hatfield, Herts, England
[11] Merck Co Inc, Kenilworth, NJ USA
[12] Natl Canc Ctr, Dept Hepatobiliary & Pancreat Oncol, Tokyo, Japan