KLK3 and metastatic malignant neoplasm in the lymph nodes: The model performance was assessed via time-dependent ROC curves, calibration curves, decision curve analysis (DCA), and Kaplan-Meier (KM) curves.<h4>Results</h4>Cox multivariate regression analysis revealed that Gleason score (GS), lymph node metastasis (LNM), seminal vesicle invasion (SVI), and free prostate-specific antigen (fPSA) were independent risk factors for BCR after RP in the elderly population (all <i>P</i> < 0.05).