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Association between programmed cell death ligand 1 expression and human epidermal growth factor receptor 2-amplified molecular subtype of breast cancer
A Mantel–Haenszel random-effects model was used for meta-analysis. Odds ratios are shown with 95 per cent confidence intervals. PD-L1, programmed cell death ligand 1. Kurozumi et al. evaluated two independent patient cohorts hence being twice in this analysis.
