ERG expression in TMPRSS2-ERG organoids is driven by AR signaling. A. Expression analysis of wildtype and three clonal TMPRSS2-ERG organoid lines. Expression of TMPRSS2 and ERG is calculated relative to β-actin. All expression values are calculated relative to wildtype organoids. B. Schematic overview of the effect of Nilutamide on ERG expression in TMRPSS2-ERG organoids. Due to the presence of an ARE in its protomer region, TMRPSS2 gene expression is driven by AR. As such, in TMPRSS2-ERG organoids, AR drives ERG overexpression. However, when Nilutamide is added to the medium, TMPRSS2 expression is prevented and ERG expression levels are restored to wildtype levels.