KLK3 and posterior cortical atrophy: However, when analyzing the different subgroups, a significant association between a lower sCMG2 concentration and an increased serum PSA could be detected in patients with localized PCa (p = 0.015, rS = −0.23; Spearman–Rho), while in patients with metastasized PCa, there was no significant association between these parameters (p = 0.21; rS = −0.16; Spearman–Rho).