While high GRB7‐expressing tumours (IHC 3+) were more likely to be HER2‐positive (p = 0.03) compared with equivocal/low/negative GRB7‐expressing tumours (IHC 2+, 1+, 0), nearly 70% of high GRB7‐expressing tumours were HER2‐negative. This evidence concerns the gene ERBB2 and neoplasm.