[1] Massachusetts Gen Hosp, Dept Med, Div Hematol Oncol, Boston, MA USA
[2] Novartis Pharmaceut, Cambridge, MA USA
[3] Mem Sloan Kettering Canc Ctr, Dept Med, Gastrointestinal Oncol Serv, New York, NY USA
[4] Univ Padua, Dept Med DIMED, Padua, Italy
[5] Veneto Inst Oncol IOV IRCCS, Padua, Italy
[6] Kindai Univ, Dept Med Oncol, Fac Med, Osaka, Japan
[7] Toho Univ, Dept Surg & Clin Oncol, Grad Sch Med, Tokyo, Japan
[8] Weill Cornell Med Coll, Mem Sloan Kettering Canc Ctr, New York, NY USA
[9] Univ Med Ctr Mainz, Inst Pathol, Mainz, Germany
[10] Natl Canc Ctr, Dept Diagnost Pathol, Tokyo, Japan
[11] Novartis Pharmaceut, E Hanover, NJ USA
[12] Univ Clin Mainz, Mainz, Germany