ERG and posterior cortical atrophy: Of note, our results revealed that ERG is specifically associated with ETS-2 and ETV-4, but not with ETS-1, in PC3 cell, nuclear extracts (Fig. 2) and even more remarkably, we found ERG to exhibit the same specificity for ETS-2 and ETV-4, but not for ETS-1 in the pooled protein lysate sample prepared from the PCa tissue samples of five patients (Fig. 3).