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PDL-1 staining in primary tumor and metastatic lymph node in gastric cancer. (a) Gastric cancer primary tumor (HE). (b) Primary tumor (no PDL-1 staining). (c) Primary tumor (low PDL-1 staining). (d) Primary tumor (high PDL-1 staining). (e) Gastric cancer metastatic tumor (HE). (f) Metastatic tumor (no PDL-1 staining). (g) Metastatic tumor (low PDL-1 staining). (h) Metastatic tumor (high PDL-1 staining). All images ×100 magnification.
