Assessment of programmed death-ligand 1 expression in primary tumors and paired lymph node metastases of gastric adenocarcinoma

Figure 1 Microscopic findings of primary tumor and metastatic lymph nodes in cases with gastric adenocarcinoma. A: Gastric adenocarcinoma with positive staining for programmed death-ligand 1 (PD-L1), original magnification, 20 ×; B: Gastric adenocarcinoma PD-L1 negative, original magnification, 20 ×; C: Lymph node with adenocarcinoma metastasis stained with hematoxylin eosin (HE), original magnification, 10 ×; D: Positive PD-L1 staining in the metastatic lymph node showed in “C”, from a case with PD-L1 negative in gastric tumor, original magnification, 10 ×; E: Lymph node metastasis in HE staining, original magnification, 10 ×; F: Positive staining for PD-L1 in the same lymph node, from a case with primary tumor also positive for PD-L1, original magnification, 20 ×.