Venn diagram describing miRNA expression patterns in the three classes of breast tissue.

<p>Venn diagram (<b>A</b>) representing differentially expressed miRNAs observed in the comparisons among the three classes (normal, primary tumor, metastatic lesion), up or down facing arrow indicate the expression level change. Tables show: the 13 miRNAs identified by the comparison between Normal <i>vs</i> Tumor (<b>B</b>); 1 miR differentially expressed only in Tumor vs Mets (<b>C</b>); 1 miR differentially expressed only in Normal vs Mets (<b>D</b>); 4 miRNAs commonly deregulated in the Tumor vs Mets and Normal vs Mets comparisons (<b>E</b>).