ERBB2 and salivary gland carcinoma: However, reliable estimates of the prevalence of HER2 positivity in SGC and its various histological subtypes are lacking.<h4>Objective</h4>To assess the prevalence of HER2 positivity in histological subtypes of salivary gland carcinomas (SGC).<h4>Methods</h4>Studies were identified by a systematic review of the literature.