[1] Hokkaido Univ Hosp, Ctr Canc, Sapporo, Hokkaido, Japan
[2] Aichi Canc Ctr Hosp, Nagoya, Aichi, Japan
[3] Japanese Fdn Canc Res, Canc Inst Hosp, Dept Gastroenterol, Tokyo, Japan
[4] Osaka Univ, Grad Sch Med, Dept Frontier Sci Canc & Chemotherapy, Osaka, Japan
[5] Tokyo Med & Dent Univ, Dept Surg Specialties, Tokyo, Japan
[6] Natl Canc Ctr Hosp East, Chiba, Japan
[7] Natl Canc Ctr, Tokyo, Japan
[8] Teikyo Univ, Sch Med, Tokyo, Japan
[9] Bayer Yakuhin Ltd, Tokyo, Japan
[10] Bayer Yakuhin Ltd, Osaka, Japan
[11] Univ Tokyo, Grad Sch Med, Dept Surg Oncol, Tokyo, Japan
[12] Tokyo Med & Dent Univ, Tokyo, Japan