CD274 and breast adenocarcinoma: As shown in Fig. 2C, PD-L1 expression was detected in three out of five mammary adenocarcinoma cell lines (FYMp, FKNp, and FONp), the T-cell lymphoma cell line (FeLV-3281), and B-cell lymphoma cell line (MS4), but not in the macrophage (fcwf-4) and fibroblast (CRFK) cell lines.