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Objectives   A cribriform architectural pattern has been reported in 9% of one unselected consecutively collected series of gastric carcinomas (GC) with unfavourable prognostic outcome. Taking into consideration the biological relevance of the human epidermal growth factor receptor 2 (HER2) status, we have analyzed a cohort of GC with a cribriform component more than 40% (CGC) to evaluate the HER2 amplification rate as a potential target for therapy with trastuzumab.Results   HER2 overexpression was encountered in 21 of 100 (21%) GC; a progressive increase in HER2 amplification was appreciated moving from non-CGC (20.6%) towards CGC cases (21.6%), although this difference does not reach a statistical significance. Nevertheless, either in univariate or in multivariate analyses, stage and HER2 status showed a significant  p  value (<0.001) in CGC patients.Conclusions   Our data confirmed a worse prognosis in all CGC patients with HER2 amplification, resulting in a shorter survival time. We invite all pathologists in their daily practice to specify the occurrence of cribriform neoplastic component in GC, either in surgical or in bioptical samples, taking into practical assessment the high HER2 overexpression rate in order to correctly treat these patients with worse behavior.

Human Epidermal Growth Factor Receptor 2 Status in Gastric Carcinomas with Distinctive Prevalent Cribriform Component