KLK3 and posterior cortical atrophy: When these results are compared with another study conducted by Øverbye et al., only three out of the 13 protein biomarkers (FAM129A, KLK3/PSA, and FOLH1) identified by Dhondt et al. and two out of the 11 protein biomarkers (FABP5 and DNPH1) identified by Fujita et al. were identified and they were all upregulated in PCa patients.