[1] Aichi Canc Ctr Hosp, Dept Gastroenterol, Nagoya, Aichi 464, Japan
[2] Hokkaido Univ Hosp, Ctr Canc, Dept Canc Chemotherapy, Sapporo, Hokkaido, Japan
[3] Misawa City Hosp, Dept Med Oncol, Misawa, Japan
[4] Hirosaki Univ, Dept Med Oncol, Hirosaki, Aomori, Japan
[5] Chiba Canc Ctr, Div Gastroenterol, Chiba 2608717, Japan
[6] Kanagawa Canc Ctr Hosp, Hepatobiliary & Pancreat Oncol Div, Yokohama, Kanagawa, Japan
[7] Kitasato Univ, Sch Med, Dept Med, Sagamihara, Kanagawa 228, Japan
[8] Osaka Med Ctr Canc & Cardiovasc Dis, Dept Hepatobiliary & Pancreat Oncol, Osaka, Japan
[9] Osaka City Gen Hosp, Dept Clin Oncol, Osaka, Japan
[10] Kinki Univ, Dept Med Oncol, Osaka, Japan
[11] Kinki Univ, Sch Med, Dept Gastroenterol & Hepatol, Osakasayama, Japan
[12] Natl Hosp Org, Shikoku Canc Ctr, Dept Gastroenterol, Matsuyama, Ehime, Japan
[13] Kochi Hlth Sci Ctr, Dept Med Oncol, Kochi, Japan
[14] Kyushu Univ, Dept Med & Bioregulatory Sci, Fukuoka 812, Japan
[15] Kyushu Univ, Dept Surg & Oncol, Fukuoka 812, Japan
[16] Kyorin Univ, Sch Med, Dept Internal Med, Mitaka, Tokyo 181, Japan
[17] Tokyo Univ Sci, Fac Engn, Tokyo 162, Japan