Contrary to ESFT, in PCa the most common ETS fusion member is ERG (about 90% of the fusion positive cases), and only 1–10% of the cases have fusion genes involving other ETS members, namely, ETV1, ETV4 and ETV5 (which cluster in the PEA3 subfamily), and FLI1 (which clusters with ERG in the ERG subfamily) [8], [12]–[14], [23]. The gene discussed is ETV4; the disease is posterior cortical atrophy.