MKI67 and neoplasm: Tumors with high Ki-67 LI were identified as risk factors of lower PFRs using bivariate (high vs. low, HR 11.97, 95% CI 1.46–98.04, p = 0.021: high vs. intermediate, HR 3.43, 95% CI 1.35–8.70, p = 0.010; Table 3) and multivariable (high vs. low, HR 12.71, 95% CI 1.51–107.23, p = 0.019: high vs. intermediate, HR 4.12, 95% CI 1.54–11.04, p = 0.005; Table 3) analyses in which tumor volume and indication of SRS in addition to Ki-67 LI were included.