 Sorafenib is the standard of care for the palliative treatment of HCC. The recommended dose of sorafenib in patients with HCC is 400 mg twice daily. Sorafenib dose-limiting toxicities include diarrhea, arterial hypertension and hand-foot syndrome. Owing a large inter-patient variability near 50 of sorafenib Area Under the Curve AUC over 12h, an over-exposure to sorafenib could explain acute toxicity. On the other hand, a suboptimal exposure could result in an insufficient anti-tumor activity as suggested by a recent study. This inter-patient variability of sorafenib pharmacokinetic is especially relevant in HCC. Indeed, most of HCC are developed on cirrhotic liver with often an impaired liver function, a decrease of albuminemia and sometimes ascitis. All these parameters are likely to impact the sorafenib pharmacokinetic. The aim of this pilot study is to correlate the sorafenib plasma concentration to observed toxicity and to the disease control rate in 100 patients. 