[1] Kyoto Univ Hosp, Dept Clin Oncol, Kyoto, Japan
[2] Osaka Med & Pharmaceut Univ Hosp, Ctr Canc Chemotherapy, Takatsuki, Osaka, Japan
[3] Japanese Fdn Canc Res, Canc Inst Hosp, Dept Surg Gastroenterol, Koto Ku, Tokyo, Japan
[4] Shikoku Canc Ctr, Matsuyama, Ehime, Japan
[5] Natl Canc Ctr, Dept Gastrointestinal Med Oncol, Tokyo, Japan
[6] Kyushu Univ, Grad Sch Med Sci, Dept Oncol & Social Med, Fukuoka, Japan
[7] Chiba Univ, Chiba, Japan
[8] Hiroshima City Asa Citizens Hosp, Hiroshima, Japan
[9] Saitama Canc Ctr, Saitama, Japan
[10] Hyogo Canc Ctr, Akashi, Hyogo, Japan
[11] Shizuoka Canc Ctr, Div Esophageal Surg, Shizuoka, Japan
[12] Keio Univ, Dept Surg, Sch Med, Tokyo, Japan
[13] Kyoto Prefectural Univ Med, Grad Sch Med Sci, Dept Mol Targeting Canc Prevent, Kyoto, Japan