While the statistical significance was not reached, a tendency was observed for a lower expression in triple-negative tumours, compared to luminal A, luminal B, or HER2 (Fig. 4c), a lower expression in grade III, compared to grades I and II (Fig. 4d), and a lower expression in HER2+ compared to pooled HER2- tumours (Fig. 4e). This evidence concerns the gene ERBB2 and neoplasm.