MKI67 and renal cell carcinoma: Our meta-analysis demonstrated that high Ki-67 expression in RCC was associated with poor OS (fixed-effect model, HR = 1.95; 95% CI: 1.44–2.64; p < 0.001; I2 = 0.0%, p = 0.594; Fig. 2A), CSS (fixed-effect model, HR = 1.67; 95% CI: 1.47–1.89; p < 0.001; I2 = 2.7%, p = 0.417; Fig. 2B), and DFS (fixed-effect model, HR = 2.56; 95% CI: 1.79–3.67; p < 0.001; I2 = 0.0%, p = 0.598; Fig. 2C).