FER1L4 and nonpapillary renal cell carcinoma: Furthermore, univariate (HR 1.799, 95% CI 1.29–2.52, p = 0.001) and multivariate Cox regression analysis (HR 1.734, 95% CI 1.23–2.44, p = 0.002) indicated that increased Fer1L4 expression was a significant and independent predictor of shortened overall survival in patients with ccRCC.