[1] Mem Sloan Kettering Canc Ctr, Gastrointestinal Oncol Serv, New York, NY 10065 USA
[2] Weill Cornell Med Coll, New York, NY 10065 USA
[3] ISFSI, Serv Cent Farm, Lugano, Switzerland
[4] Univ Milan, European Inst Oncol, Div Early Drug Dev, Milan, Italy
[5] Univ Milan, Dept Hematol Oncol, Milan, Italy
[6] Pfizer Inc, New York, NY 10017 USA
[7] Pfizer Ltd, Sandwich, Kent, England