PD-L1 expression in breast cancer: expression in subtypes and prognostic significance: a systematic review.
Elisabeth Specht StovgaardAnne Dyhl-PolkAnne RoslindEva BalslevDorte NielsenPublished in: Breast cancer research and treatment (2019)
Further investigation of PD-L1 expression in breast cancer and its effect on prognosis is required. There is little consensus on the methods used to evaluate PD-L1 expression immunohistochemically, and this may contribute to the diverging results found in this study.