ERBB2 and neoplasm: High miR-34a expression was associated with a non-favourable tumour phenotype of positive nodal status (p = 0.006), high tumour grade (p<0.0001), ER-negativity (p = 0.0002), high proliferation rate (p<0.0001) as well as high expression of HER2 (p = 0.0002), p53 (p<0.0001) and cyclin E (p<0.0001).