[1] Natl Canc Ctr Hosp East, Dept Gastroenterol & Gastrointestinal Oncol, Kashiwa, Chiba, Japan
[2] Div Canc Treatment & Diag, Bethesda, MD USA
[3] NCI, NIH, Bethesda, MD 20892 USA
[4] Natl Canc Ctr Hosp East, Kashiwa, Chiba, Japan
[5] Natl Canc Ctr, Exploratory Oncol Res & Clin Trial Ctr, Kashiwa, Chiba, Japan
[6] Canc Therapy Evaluat Program, Invest Drug Branch, Rockville, MD USA