[1] Site Hosp Nord, Ctr Rene Gauducheau, Nantes, France
[2] Osped Niguarda Ca Granda, SC Div Oncol Falck, Milan, Italy
[3] Univ Glasgow, Dept Oncol, Canc Res UK, Glasgow, Lanark, Scotland
[4] Vall Hebron Univ Hosp, Dept Med Oncol, Barcelona, Spain
[5] Mt Sinai Hosp, Dept Oncol, Toronto, ON M5G 1X5, Canada
[6] Hosp Gastroenterol, Buenos Aires, DF, Argentina
[7] Univ Catholique Louvain, Ctr Canc, B-1200 Brussels, Belgium
[8] NHS Fdn Trust, London, England
[9] Amgen Inc, Thousand Oaks, CA 91320 USA