RNA sequencing detected a novel in-frame fusion gene, ESR1-ARMT1, between ESR1, encoding estrogen receptor 1, and ARMT1, encoding acidic residue methyltransferase 1, in an ER+ luminal type invasive ductal carcinoma, case BR15-035T (Supplementary Figure 2). This evidence concerns the gene DCPH1 and invasive ductal breast carcinoma.