MiR-198 is located in the 3′-UTR region of protein-coding gene FSTL1, while the other two miRNAs are encoded in the exon of non-coding genes, MIR137HG and MIR155HG. MiR-198 is not co-expressed with its host gene FSTL1 (R = −0.04 in breast cancer; FDR = 0.52), which validates previous finding about their mutually exclusive expression from a single transcript [37]. This evidence concerns the gene FSTL1 and breast cancer.