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Aims
Pembrolizumab has shown promising results for patients with programmed cell death ligand‐1 (PD‐L1)‐positive advanced biliary tract cancer in an ongoing clinical trial. However, data on PD‐L1 expression in bile duct cancers is limited, and the frequency of PD‐L1 positivity varies, which may be partly due to the assay used. The aim of this study was to evaluate PD‐L1 expression status in bile...
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