EGF and posterior cortical atrophy: To determine whether ETV1 expression affects the expression and activation of EGFR in prostate cells, we quantified the levels of total EGFR and Tyr1068‐phosphorylated EGFR (p‐EGFR) upon stimulation with EGF in two prostate cell lines with modulation of ETV1 expression: the nontumorigenic PNT2 cells with de novo ETV1 overexpression, mimicking early‐stage PCa development, and the tumorigenic LNCaP cells with stable silencing of ETV1 expression, mimicking advanced PCa with and without ETV1 overexpression (Fig. 1).