As none of these proteins was expressed solely in the prostate and only the prostate-specific antigen (KLK3) was characterized with elevated expression in the prostate, compared to other tissues, further selection was performed based on the number of independent identifications by proteomics tissue studies, expression in normal and PCa tissues (HPA), molecular functions, biological processes (UniProtKB), and literature data mining (association with PCa/Ca). The gene discussed is KLK3; the disease is posterior cortical atrophy.