The aim of this study is to evaluate if patients education programs for the prevention of dermatological events (HFSR, rash, desquamation) can reduce the onset these adverse events (all grades). The reduction of dermatological adverse effects would concomitantly limit the frequencies of sorafenib dose reduction and interruptions in mRCC patients not suitable for cytokines or anti-angiogenesis (bevacizumab or sunitinib) therapy as first line treatment.