1. Medical Oncology Department, Instituto de Investigacion Sanitaria Gregorio Marañon, Hospital Universitario Gregorio Marañon, 28007 Madrid, Spain
2. Medical Oncology Department, Hospital Universitario Clínico San Carlos, 28040 Madrid, Spain
3. Pathology Department, Hospital Universitario Gregorio Marañon, Complutense University, 28007 Madrid, Spain
4. Surgery Department, Hospital Universitario Sant Pau, Universidad Autonoma de Barcelona, 08035 Barcelona, Spain
5. Radiation Oncology Department, Hospital Virgen de la Victoria, 29010 Malaga, Spain
6. Medical Oncology Department, Hospital Universitario Canarias, 38320 Santa Cruz de Tenerife, Spain
7. Sarcoma Multidisciplinary Unit, Surgery Department, Hospital Virgen de la Arrixaca, 30120 Murcia, Spain
8. Sarcoma Multidisciplinary Unit, Medical Oncology Department, Idibell, Instituto Catalan Oncología Hospitalet, 08908 Barcelona, Spain
9. Medical Oncology Department, Fundacion Jimenez Diaz University Hospital, 28040 Madrid, Spain
10. Medical Oncology Department, Hospital General de Villalba, 28400 Madrid, Spain
11. Health Research Institute-Fundación Jiménez Díaz (IIS-FJD), Universidad Autónoma de Madrid (UAM), 28040 Madrid, Spain
12. Surgery Department, Hospital Universitario Gregorio Marañon, Complutense University, 28040 Madrid, Spain
13. Medical Oncology Department, Hospital Universitario Miguel Servet, 50009 Zaragoza, Spain
14. Radiology Department, Hospital Universitario Clínico San Carlos, 28040 Madrid, Spain
15. Radiation Oncology Department, Hospital Universitario Gregorio Marañon, Complutense University, 28007 Madrid, Spain
16. Surgery Department, Hospital San Juan de Dios, 14012 Cordoba, Spain
17. Sarcoma Multidisciplinary Unit, Surgery Department, Hospital Universitario y Politécnico La Fe, 46026 Valencia, Spain
18. Pathology Department, Hospital Universitario Santa Creu i Sant Pau, 08025 Barcelona, Spain
19. Radiology Department, Hospital Universitario Gregorio Marañon, Complutense University, 28007 Madrid, Spain
20. Medical Oncology Department, Hospital Universitario La Paz—IdiPAZ, 28046 Madrid, Spain
21. Medical Oncology Department, Vall D’Hebron University Hospital, 08035 Barcelona, Spain