The results obtained showed that TNRC6B gene expression had a diagnostic accuracy of PCa of 65%, which is quite acceptable considering we are using a single biomarker; although we were unable to compare the diagnostic power obtained for TNRC6B gene expression levels with the diagnostic power of classic PSA biomarker used for PCa diagnosis because gene expression levels were retrieved from the same patient but from different tissue site, PT and N-PP, it still exceeds PSA serum diagnostic values as stated in the literature[23]. The gene discussed is TNRC6B; the disease is posterior cortical atrophy.