CD274 and neoplasm: They found that 10.5% of DLBCL samples expressed PD-L1 in tumor cells (n=132/1253 DLBCL samples; using a cut-off of 30%), while it was expressed in 15.3% of ME cells, which were essentially composed of macrophages (n=172/1121 DLBCL samples; using a cut-off of 20%).