Consistent with the demonstrated lower expression in EMT-positive triple-negative breast cancer cell lines, patient data show a statistically significant decrease in copy number for the MIR203 gene in such cancers whether categorized based on intrinsic subtype, as in basal-like breast cancers, or based on histological analysis of receptor expression, as in triple-negative breast cancers (Figure 6). This evidence concerns the gene MIR203A and breast cancer.