Fig. 1: Representative histological images and survival analyses of gastric MANECs.

a H&E staining (100×) showed the separated NEC (arrow) and adenocarcinoma (cross-shape) components. Immunohistochemistry staining (100×) showed positive Syn expression only in the NEC component and positive CK8/18 expression in both the NEC and adenocarcinoma components. Ki-67 indicated the cell proliferation activity of both tumor components. b Univariate survival analyses of PFS and OS in 34 cases of gastric MANEC. MANEC mixed adenoneuroendocrine carcinoma, H&E hematoxylin and eosin, NEC neuroendocrine carcinoma, PFS progression-free survival, OS overall survival, LN lymph node.