BIRC5 and renal cell carcinoma: Regarding extent of tumor, high survivin expression was correlated with poor OS (HR, 2.84; 95% CI: 1.68–4.79; p < 0.001), CSS (HR, 2.31; 95% CI: 1.30–4.10; p = 0.004), and PFS (HR, 2.20; 95% CI: 1.58–3.08; p < 0.001) for all stages of RCC; with poor CSS (HR, 2.75; 95% CI: 1.23–6.15; p = 0.014) for localized RCC.