Dill et al. evaluated 245 primary and 40 metastatic (20 nodal and 20 distant metastasis) BCs with PD-L1 IHC on tissue microarrays and revealed that PD-L1 staining (clone SP142) of tumor cells was seen in 12% of primary BCs, including 31% of TNBCs. This evidence concerns the gene CD274 and neoplasm.