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lüll Protein kinase inhibitors in the treatment of renal cell carcinoma: sorafenib Bracarda S; Caserta C; Sordini L; Rossi M; Hamzay A; Crino LAnn Oncol 2007[Jun]; 18 Suppl 6 (ä): vi22-5Sorafenib is an orally available multikinase inhibitor active on vascular endothelial growth factor receptor-2 and -3, platelet-derived growth factor receptor-beta, B-RAF, C-RAF, flt3 and C-Kit. Phase I studies showed its activity on renal cell carcinoma (RCC) and other neoplasms and identified the schedule of 400 mg (two tablets) b.i.d. as better tolerated and potentially active. The original design selected for the principal phase II trial, randomization discontinuation trial, showed the particular activity profile of this drug: low objective response rates but significant increases in progression-free survival [PFS, which frequently translate in increased overall survival (OS)]. A pattern of response completely agrees with an antiangiogenic (cytostatic) agent. The potential efficacy of sorafenib was confirmed in immunotherapy-refractory advanced RCC cases by 'TARGETs', the largest randomized double-blind study ever carried out in kidney cancer. With a doubled PFS, a trend in OS and a modest toxicity profile, mainly grade 1-2 skin toxicity and diarrhea, sorafenib has been recently approved from the Food and Drug Administration and European Agency for the Evaluation of Medicinal Products for the second-line treatment of advanced RCC. Numerous trials are ongoing to test new schedules and drug combinations, while promising results were recently achieved also in hepatocellular carcinoma. With drugs such as sorafenib, angiogenesis could become an Achilles's heel for RCC.|Antineoplastic Agents/*therapeutic use[MESH]|Benzenesulfonates/*therapeutic use[MESH]|Carcinoma, Renal Cell/*drug therapy/enzymology[MESH]|Double-Blind Method[MESH]|Drug Evaluation[MESH]|Humans[MESH]|Kidney Neoplasms/*drug therapy/enzymology[MESH]|Niacinamide/analogs & derivatives[MESH]|Phenylurea Compounds[MESH]|Protein Kinase Inhibitors/*therapeutic use[MESH]|Pyridines/*therapeutic use[MESH]|Randomized Controlled Trials as Topic[MESH]|Sorafenib[MESH] |