1. Medical Oncology Department, University Hospital Virgen del Rocío, 41013 Sevilla, Spain
2. Medical Oncology Department, National Cancer Institute, 11600 Montevideo, Uruguay
3. Instituto de Investigacion Sanitaria Fundacion Jimenez Diaz (IIS/FJD), 28015 Madrid, Spain
4. Medical Oncology Department, Fundación Jimenez Diaz University Hospital, 28040 Madrid, Spain
5. General de Villalba University Hospital, 28400 Madrid, Spain
6. Pathology Department, Hospital Virgen del Rocío, 41013 Sevilla, Spain
7. Department of Surgical, Oncological and Oral Sciences, Section of Medical Oncology, University of Palermo, 90127 Palermo, Italy