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Table 1 Main characteristics of the studies included in this meta-analysis

From: Clinicopathological and prognostic significance of programmed death ligand-1 expression in breast cancer: a meta-analysis

Study Country Number of patient IHC evaluation Cutoff value for PD-L1 positive Positive cell (Tumor vs. immune) HR for DFS LL for DFS UL for DFS HR for OS LL for OS UL for OS
Qin T (2015) China 870 Percentage ≥5% tumor 1.503 1.091 2.071 2.262 1.598 3.203
Baptista M (2016) Brazil 192 Allred score ≥4 tumor 0.84 0.39 1.83 0.3 0.09 0.94
Ali HR (2015) England 5763 N/A N/A tumor and immune N/A N/A N/A N/A N/A N/A
Muenst S (2014) Switzerland 650 H-score ≥100 tumor N/A N/A N/A 4.43 3.424 5.731
Park IH (2016) Korea 333 H-score N/A immune 1.21 0.56 2.62 2.08 0.86 5.04
Ghebeh H (2007) Saudi Arabia 69 N/A N/A tumor N/A N/A N/A N/A N/A N/A
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