*2.3. Statistical Analysis*

Results were analyzed with JMP13 software (SAS Institute Inc., Cary, NC, USA); *p*-values were calculated with the Kruskal–Wallis test, Pearson's chi-squared test, and Wilcoxon signed-rank test. PSA PFS was estimated by Kaplan–Meier analysis and groups compared with the log-rank test. Cox proportional hazard analysis was used to examine the factors associated with PSA PFS. A *p* value less than 0.05 was considered to be statistically significant.
