ERBB2 and adenocarcinoma: 10 It was expressed more in intestinal and mixed-type, adenocarcinoma and moderately differentiated tumours. 10 In a Kenyan descriptive cross-sectional study of sixty-six biopsy and resected specimens of histologically diagnosed gastric cancers, HER2 overexpression rate was found to be 42%. In this study, HER2 overexpression was higher in intestinal than diffuse-type cancers, and it was not associated with gender, age or anatomical site. 11