GRB7 and HER2 mRNA expression was significantly higher in OE19, OE33, OACP4C, and Eso26 tumour cell lines than in non‐cancerous NES cells (Figure 2A), consistent with GRB7 and HER2 gene amplification in these cell lines (supplementary material, Table S5). The gene discussed is ERBB2; the disease is neoplasm.