CD274 and neoplasm: Hence, 45 patient samples with PD-L1 positive (n = 23) or PD-L1 negative (n = 22) expression in tumor cells were stained for CD11c and CD163 (Figure 5A) and three different populations could be detected, i.e., CD163+CD11c−, CD163+CD11c+ and CD163-CD11c+.