1 Department of Surgery, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy. alessandro.gronchi@istitutotumori.mi.it.
2 Gastric and Mixed Tumor Service, Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, NY, USA.
3 Department of Surgery, Center for Sarcoma and Bone Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Brigham and Women's Hospital, Boston, MA, USA.