[1] Seoul Natl Univ Coll Med, Seoul, South Korea
[2] Yonsei Univ Coll Med, Yonsei Canc Ctr, Seoul, South Korea
[3] Univ Washington Sch Med, Div Med Oncol, Seattle, WA USA
[4] Tel Aviv Univ, Tel Aviv Sourasky Med Ctr, IL-69978 Tel Aviv, Israel
[5] Univ Chicago, Chicago, IL 60637 USA
[6] Univ S Florida, Coll Med, H Lee Moffitt Canc Ctr & Res Inst, Tampa, FL 33612 USA
[7] Yale Canc Ctr, New Haven, CT USA
[8] Chaim Sheba Med Ctr, IL-52621 Tel Hashomer, Israel
[9] Merck & Co Inc, Kenilworth, NJ USA
[10] Aichi Canc Ctr Hosp, Nagoya, Aichi 464, Japan