AR and prostate adenocarcinoma: Interestingly, in the TCGA prostate adenocarcinoma dataset2, the two patients with fusions juxtaposing the MIPOL1 locus with ETV1 had RNA-level fusion junctions that matched exactly with the end of the first annotated exon of AL121790.1 (Fig. 3d)—suggesting that this AR-regulated non-coding gene is a common 5′ fusion partner in ETV1 gene rearrangements, where it drives ETV1 overexpression through its highly active promoter.