Research Article

Primary Tumor Characteristics Are Important Prognostic Factors for Sorafenib-Treated Patients with Metastatic Renal Cell Carcinoma: A Retrospective Multicenter Study

Figure 1

Kaplan-Meier analysis of progression-free survival (a, c) and overall survival (b, d) with log-rank tests for all sorafenib-treated patients () according to the Memorial Sloan Kettering Cancer Center (MSKCC) (a, b) and Heng (c, d) risk groups. PFS, progression-free survival; OS, overall survival; CI, confidence interval.
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