[1] EPOC, Natl Canc Ctr, Div Canc Immunother, Tokyo, Japan
[2] Kanagawa Canc Ctr, Res Inst, Dept Canc Immunother, Yokohama, Kanagawa, Japan
[3] Kyushu Univ, Grad Sch Med, Dept Anat Path Pathol Sci, Fukuoka, Fukuoka, Japan
[4] Natl Canc Ctr Hosp East, Dept Gastroenterol & Gastrointestinal Oncol, Kashiwa, Chiba, Japan
[5] Yokohama City Univ, Grad Sch Med, Dept Gastroenterol Surg, Yokohama, Kanagawa, Japan