KLK3 and posterior cortical atrophy: Moreover, other statistical differences including PSA (P < 0.001), fPSA (P < 0.001), PSAD (P < 0.001), f/TPSA (P < 0.001) DRE findings (P < 0.001) and hypoechoic under transrectal ultrasound findings (P < 0.001) were found between the PCa group and non-PCa group.