Kaplan-Meier curves of CSS of pN0 patients (a) and of pN1 patients (b) stratified by D'Amico risk classification, as well as Kaplan-Meier curves of CSS of pN0 patients (c) and of pN1 patients (d) stratified by the pathological Gleason score (PGL) of the surgical tissue (≤7 vs. ≥8).