Comparison of HER2 expression in paired biopsies and surgical specimen of gastric and esophageal adenocarcinoma: Impact of neoadjuvant chemotherapy.

4069 Background: HER2 is overexpressed in 10 to 20% of gastro-esophageal adenocarcinoma (GE-ADK), and is a target for trastuzumab in metastatic patients. We conducted a study to compare HER2 expres...