PCa is one of the common diseases in older men, frequently occurring in western countries in particular.[1] Up to now, the pathogenesis of PCa has not been identified utterly, but a few risk factors have been recognized, including heredity, high-fat diet, low intake of isoflavone, and excessive intake of pickled meats.[35–38] Recently, reduce of copy number in AR gene CAG repeat sequences is also proposed to possibly conduce to the occurrence of PCa.[7]. The gene discussed is AR; the disease is posterior cortical atrophy.