We aimed to identify prognostic factors associated with progression-free survival (PFS) and overall survival (OS) in metastatic\nrenal cell carcinoma (mRCC) patients treated with sorafenib. We investigated 177 patients, including 116 who received sorafenib\nas first-line therapy, using the Cox regression model. During a median follow-up period of 19.2 months, the PFS and OS were 6.4\nand 32.6 months among all patients and 7.4 months and undetermined for first-line sorafenib-treated patients, respectively. Clinical\nT3-4 stage (hazard ratio [HR] 2.56) and a primary tumor size >7 cm(HR 0.34) were significant prognostic factors for PFS among all\npatients, as were tumor size >7 cm(HR 0.12), collecting system invasion (HR 5.67), and tumor necrosis (HR 4.11) for OS (
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