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| Study population | Histology | Number of samples | PD-L1 positive (%) | Outcome | Reference |
|---|---|---|---|---|---|
| Esophageal | Squamous | 41 | 44 | Worse outcomes | (30) |
| Gastric | Adenocarcinoma | 102 | 42.2 | Nodal mets, advanced stage | (31) |
| Adenocarcinoma | 111 | 63 | Advanced stage, worse outcome | (32) | |
| Adenocarcinoma | 243 | 43.6 | Improved DFS, lower stage | (49) |
PD-L1, programmed death ligand 1; DFS, disease free survival.
