Fig. 4From: Mixed adenoneuroendocrine carcinoma with loss of HER2 positivity after trastuzumab-based chemotherapy for HER2-positive gastric cancer: a case reportImmunohistochemical staining for synaptophysin, chromogranin A, and carcinoembryonic antigen in the resected specimen. The specimen was positive for synaptophysin (a), chromogranin A (b), and carcinoembryonic antigen (c)Back to article page