KLK3 and posterior cortical atrophy: The concentration of tPSA, fPSA, PSA-α1ACT, PSA-α2M, PSA-hK2 and CPR was significantly higher in patients with PCa than in those with BB (P < 0.001, P = 0.012, P < 0.001, P < 0.001 and P < 0.001, respectively), whereas prostate volume, FPR and FPR/CPR ratio were significantly higher in BB than in PCa (P < 0.001) (Table 1).