Cells expressing any prostate-related genes were present in 70.97% of samples suggesting only 29.03% of cells (expressing GAPDH only) were not of prostate origin, with a higher percentage of prostate cells in the PCa samples compared with BPH (KLK3: 11/15 in PCa patient and 5/16 in BPH patient; AR: 10/15 in PCa patient and 6/16 in BPH patient). This evidence concerns the gene KLK3 and posterior cortical atrophy.