Department of Medical Oncology, Università Campus Bio-Medico di Roma, Rome, Italy. Department of Translational Research and New Technologies in Medicine and Surge, Unit of Medical Oncology 2, Azienda Ospedaliera Universitaria Pisana, Istituto Toscano Tumori, Pisa, Italy. Electronic address: chiaracremolini@gmail.com. Department of Clinical and Experimental Oncolog, Medical Oncology Unit 1, Istituto Oncologico Veneto Istituto di Ricovero e Cura a Carattere Scientifico, Padova, Italy. Department of Translational Research and New Technologies in Medicine and Surge, Unit of Medical Oncology 2, Azienda Ospedaliera Universitaria Pisana, Istituto Toscano Tumori, Pisa, Italy. Department of Radiologica, Oncological and Pathological Sciences, Umberto I Policlinico di Roma, Rome, Italy. Medical Oncology, IRCCS San Raffaele, Milan, Italy. S. C. Oncologia, ASST Ospedale di Cremona, Cremona, Italy. Department of Medical Oncology, Fondazione Poliambulanza, Brescia, Italy. SSD ColoRectal Cancer Unit-A.O.U. Department of Oncology, Azienda Ospedaliero Universitaria Città della Salute e della Scienza di Torino, Turin, Italy. Division of Medical Oncology B, Centro di Riferimento Oncologico, Aviano, Italy. Department of Oncology, Ospedale F. Lotti, Pontedera, Italy. Department of Medical Oncology, Azienda Ospedaliera S Croce e Carle, Cuneo, Italy. Department of Oncology, AUSL 4 Prato, Prato, Italy. Medical Oncology 2, Policlinico San Martino Hospital IRCCS per l'Oncologia, Genoa, Italy. Clinical Trials Coordinating Cente, Istituto Toscano Tumori, University Hospital Careggi, Florence, Italy.