University of Basel - University Hospital Basel, University of Basel - Department of Biomedicine, SAKK Coordinating Center, University of Basel - University Hospital Basel, Department of Oncology, HFR Fribourg – Hôpital fribourgeois, Department of Oncology, HFR Fribourg – Hôpital fribourgeois, Cantonal Hospital of St. Gallen, Cantonal Hospital of St. Gallen, University of Basel - University Hospital Basel, Cantonal Hospital Winterthur, Cantonal Hospital Winterthur, University Hospital Zurich, University Hospital Zurich, Department of Oncology, University Hospital Lausanne CHUV, Divison of Oncology/Haematology, Cantonal Hospital Graubünden, Divison of Oncology/Haematology, Cantonal Hospital Graubünden, University of Bern - Department of Medical Oncology, Department of Oncology/Haematology, Cantonal Hospital Aarau, Cantonal Hospital Baden, University of Geneva - Department of Oncology, Oncology Institute of Southern Switzerland, Division of Medical Oncology, St. Claraspital, Centre de Chimiothérapie Anti-Cancéreuse, SAKK Coordinating Center, SAKK Coordinating Center, Department of Thoracic Surgery, University Hospital Lausanne CHUV, Cantonal Hospital Winterthur and Independent