As regards miR-9-3p expression, similar levels were found in the luminal subtype and HER2 amplified subtype (Median: 0.28, IQR: 0.14–0.67 and Median: 0.24, IQR: 0.13–0.96 respectively), whereas the highest levels were detected in Triple Negative tumours (Median: 1.26, IQR: 0.36–2.59) (p = 0.004). Here, ERBB2 is linked to neoplasm.