The HER2 staining in cervical adenocarcinoma frequently showed an incomplete membrane (basolateral or ‘U’‐shaped) pattern (15/123, 12.2%) and intratumoral staining heterogeneity (21/123, 17.1%) (Figure 2C,D) resembling that in gastric and gastroesophageal adenocarcinoma rather than breast carcinoma. This evidence concerns the gene ERBB2 and cervical adenocarcinoma.