[1] Ain Shams Univ, Dept Clin Oncol, Fac Med, Lotfy Elsayed St, Cairo 113331, Egypt
[2] Swiss Canc Inst, Dept Canc Res, Zurich, Switzerland
[3] Hirslanden Hosp Zurich, Surg Ctr Zurich, Dept Surg, Zurich, Switzerland
[4] Heidelberg Univ, Dept Gen Visceral & Transplant Surg, Heidelberg, Germany
[5] Swiss Tumor Immunol Inst SwissTII, OncoCtr Zurich, Zurich, Switzerland
[6] Gastrointestinal Tumor Ctr Zurich GITZ, OncoCtr Zurich, Zurich, Switzerland
[7] Ctr Zug, Dept Med Oncol, Zurich, Switzerland