No significant difference was found between patients with and without sarcopenia regarding age, the extent of the disease, ECOG PS, HER2 status, first-line regimen, response to chemotherapy, receipt of second-line therapy, number of metastatic sites, hemoglobin level, serum albumin level, neutrophil to lymphocyte ratio, and C-reactive protein level. Here, ERBB2 is linked to sarcopenia.