KLK3 and benign prostatic hyperplasia: The data showed 100% sensitivity and specificity comparing: (1) PCa vs. CTR (Figure 1D)—AUC: 1.00, p < 0.001; Cut-off: μg/mL Exo-PSA = 17.07; (2) PCa vs. BPH: 98.57 sensitivity and 80.28% specificity (Figure 1E)—AUC: 0.98, p < 0.001; Cut-off: μg/mL Exo-PSA = 23.32; (3) BPH vs. CTR: 98.57 sensitivity and 80.28% specificity (Figure 1F)—AUC: 0.90, p < 0.001; Cut-off: μg/mL Exo-PSA = 23.32.