Prognostic Significance of HER2 Expression for Gastric Cancer with Clinically Para-aortic Lymph Node Metastasis.

BACKGROUND/AIM:To determine the prognostic utility of trastuzumab-based chemotherapy based on human epidermal growth factor receptor 2 (HER2) expression in patients with para-aortic lymph node (PAN) metastasis from gastric cancer.PATIENTS AND METHODS:A total of 41 patients with clinical PAN metastasis from gastric cancer who underwent chemotherapy were retrospectively enrolled.RESULTS:Eighteen (43.9%) patients had HER2-positive tumors and consequently, received trastuzumab-based chemotherapy. A total of 11 patients underwent surgery. HER2 status was significantly correlated with the number of distant metastatic sites, the presence or absence of trastuzumab-based chemotherapy, and the presence or absence of gastrectomy. HER2-positive patients had significantly better prognosis than HER2-negative patients. Multivariate analysis identified age and trastuzumab-based chemotherapy based on HER2 status as an independent prognostic factor.CONCLUSION:Assessing HER2 expression and subsequent trastuzumab-based chemotherapy can be an effective method for determining the prognosis of patients with PAN metastasis from gastric cancer.