[1] Univ Duisburg Essen, German Tumor Ctr, Essen, Germany
[2] Dana Farber Canc Inst, Boston, MA 02115 USA
[3] Canc Hosp, Beijing, Peoples R China
[4] Univ Antwerp Hosp, Antwerp, Belgium
[5] Natl Canc Ctr Hosp E, Chiba, Japan
[6] Tongji Univ, Shanghai 200092, Peoples R China
[7] Beijing Inst Canc Res, Beijing, Peoples R China
[8] AstraZeneca, Med Sci, Wilmington, DE USA
[9] AstraZeneca, Biostat, Macclesfield, Cheshire, England
[10] Univ Texas MD Anderson Canc Ctr, Houston, TX 77030 USA