CD274 and carcinoma: Using a retrospective cohort of 244 patients with TNBC, our data demonstrates that high stromal CD68+PD-L1+ macrophages have incrementally improved prognostic significance to that provided by PD-L1 stromal expression alone or in any other key cellular context, e.g., stromal CD8+PD-L1+ T cells, carcinoma epithelial PD-L1+.