1. Medical Oncology Department, University Hospital Fundación Jimenez Diaz, 28040 Madrid, Spain
2. University Hospital General de Villalba, 28400 Collado Villalba, Madrid, Spain
3. Instituto de Investigacion Sanitaria Fundacion Jimenez Diaz (IIS/FJD; UAM), 28015 Madrid, Spain
4. Candiolo Cancer Institute, FPO-IRCCS, SP 142 Km 3.95, 10060 Candiolo, Italy
5. Department of Oncology, University of Turin, 10124 Turin, Italy
6. International Department of Medical Oncology, Gustave Roussy, 114 Rue Edouard Vaillant, 94805 Villejuif, France