The t-PSA concentrations were computed using the linear regression equations of the Calbiochem and Scripps PSA standards, as well as, the rPSA immunoassay calibrant; the concentrations ranged between 4.0 ng/mL and 17.4 ng/mL for PCa serum sample 1 and 38.9 ng/mL and 133.5 ng/mL for sample 2. The gene discussed is KLK3; the disease is posterior cortical atrophy.