[1] Natl Canc Ctr, Tokyo, Japan
[2] Aichi Canc Ctr Hosp, Dept Clin Oncol, Nagoya, Aichi 464, Japan
[3] Shizuoka Canc Ctr, Div Gastrointestinal Oncol, Shizuoka, Japan
[4] Kochi Hlth Sci Ctr, Dept Med Oncol, Kochi, Japan
[5] Gunma Canc Ctr, Dept Surg, Gunma, Japan
[6] Kumamoto Univ, Grad Sch Med Sci, Dept Surg Gastroenterol, Kumamoto, Japan
[7] Kinki Univ, Sch Med, Dept Med Oncol, Osaka 589, Japan
[8] Chiba Canc Ctr, Dept Gastroenterol, Chiba 2608717, Japan
[9] Nagoya Mem Hosp, Dept Med Oncol, Nagoya, Aichi, Japan
[10] Tokyo Med & Dent Univ, Grad Sch, Dept Surg Oncol, Tokyo, Japan