KLK3 and posterior cortical atrophy: Interestingly SP Dkk-3 levels correlated with SP PSA levels (all patients: p = 0.013) but this correlation was limited to patients with biopsy confirmed PCa (all patients: p = 0.007; > 3 years follow-up: p = 0.026) while no correlation was observed in patients with negative biopsies (all patients: p = 0.301; > 3 years follow-up: p = 0.620).