1. University of Torino, Department of Oncology, Torino, Italy, Torino, Italy;
2. European Organisation for Research and Treatment of Cancer (EORTC), Brussels, Belgium;
3. University Claude Bernard Lyon I, Centre Leon Berard, Lyon, France;
4. Sarcoma Unit, Division of Medical Oncology, Candiolo Cancer Institute - FPO, IRCCS, Candiolo, Italy;
5. Gustave Roussy Cancer Center, Villejuif, France;
6. Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland;
7. Medical Oncology Department, Institut Curie, Paris, France;
8. Virgen del Rocio University Hospital, Institute of Biomedicine Research (IBIS)/CSIC/Universidad de Sevilla, Seville, Spain;
9. Medical Oncology Department, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy;
10. Oncology Institute, Assaf Harofeh Medical Center, Zrifin, Israel;
11. Service d'Oncologie Médicale Chu la Timone, Marseille, France;
12. Department of Medical Oncology, University Campus Bio-Medico of Rome, Rome, Italy;
13. University of Heidelberg, Mannheim University Medical Center, ITM - Interdisciplinary Tumor Center Mannheim, Sarcoma Unit, Mannheim, Germany;
14. St James's Institute of Oncology, Leeds Institute of Cancer and Pathology, University of Leeds and Leeds Teaching Hospitals NHS Trust, Bexley Wing, St James's Hospital, Leeds, United Kingdom;
15. Medical Oncology, Clinique Universitaire Saint-Luc, Institut Roi Albert II, Brussels, Belgium;
16. Department I of Internal Medicine, University Hospital Cologne, Köln, Germany;
17. Leiden University Medical Center, Leiden, Netherlands;
18. Department of Surgery, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy;