Here in this study, we found that knocking down USP8 significantly inhibited the PCa cell migration by suppressing the EMT process through the increased E-cadherin and decreased N-cadherin, whereas USP8 overexpression promoted the EMT process through the decreased E-cadherin and increased N-cadherin and so thereby increased the migration of both DU145 and PC3 cells. The gene discussed is CDH1; the disease is posterior cortical atrophy.