KLK3 and posterior cortical atrophy: Among the 18 patients with mCRPC, PSA levels ranged from 4.05 to 12,356 ng/ml (2384.95 ± 4135.96 ng/ml), whereas PSA levels ranged from 0.04 to 7,890 ng/ml (1247.57 ± 2150.77 ng/ml) among treatment-naïve PCa patients.