Reads aligned to these 3′UTR sequences were obtained using the TCGA Breast Cancer transcriptome dataset for 13 pairs (Tumor and Normal-Adjacent) from the TNBC subtype, 56 pairs of ER+, and 20 pairs of HER2+ subtypes and were provided as input to the ReMIx workflow (see Transparent Methods). This evidence concerns the gene ESR1 and breast cancer.