Among the 14 proteins identified as potential biomarkers, differential expression of AZGP1 (upregulated in GS7 vs. GS5) and Pigment epithelium-derived factor (PEDF, downregulated in GS7) was validated in serum (n = 18 PC GS5, n = 19 PC GS7, n = 13 BPH) and tissue samples (n = 29 for PEDF, n = 27 for AZGP1) [73]. Here, AZGP1 is linked to benign prostatic hyperplasia.