KLK3 and posterior cortical atrophy: Among patients with prostate-specific antigen (PSA) at 2–10 ng/mL or 2–20 ng/mL, PRS still had an observable ability to differentiate PCa in the group of prostate health index (phi) at 27–36 (Ptrend < 0.05) or >36 (Ptrend ≤ 0.001).