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The Effectiveness of Sorafenib over Other Targeted Agents in the Second-Line Treatment of Metastatic Renal Cell Carcinoma: a Meta-Analysis.

The aim of the study was to perform a meta-analysis to compare the therapeutic effects and adverse events (AEs) of sorafenib in second-line treatments of metastatic renal cell carcinoma (mRCC). We searched online electronic databases: Pubmed, Embase, Cochrane library updated on November 2017.Trials of the effectiveness of sorafenib in second-line treatments of advanced RCC were included, of which the main outcomes were objective response rate (ORR), progression-free survival (PFS), overall survival (OS) and grade 3/4 AE. Other TAs significantly reduced the risk of PFS compared to sorafenib with respect to second-line treatment (HR = 0.74; 95% CI, 0.65-0.83; p < 0.00001). No significant differences were, however, found in patients in terms of the ORR (HR = 1.82; 95% CI, 0.98-3.35; p = 0.06). Frequencies of the most common toxicities were overall similar and adverse events differed only in sensitivity analysis in rash with exclusion of other TAs (HR = 0.16; 95% CI, 0.05-0.52; p = 0.002). Overall survival was not debated between groups. In patients with mRCC, second-line sorafenib is associated with similar ORR as other target agents. While, sorafenib did not demonstrate a PFS advantage compared with other target agents, suggests sorafenib may not benefit patients with mRCC. Tolerability due to toxicities is similar compared sorafenib with other target agents. Further characterization of the RCC oncogenic pathway, and the ongoing clinical trials should help optimize the treatment option for second-line therapy of advanced renal cell carcinoma.

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