[1] Ist Toscano Tumori, Azienda Osped Univ Pisana, Div Med Oncol 2, Pisa, Italy
[2] Ist Toscano Tumori, Azienda USL Livorno 6, Div Med Oncol, Pisa, Italy
[3] Univ Campus Biomed, Div Med Oncol, Rome, Italy
[4] Univ Pisa, Dept Internal Med, Div Chemotherapy & Pharmacol, I-56100 Pisa, Italy