MRC1 and neoplasm: In addition, Pearson correlation coefficient test revealed an association between tumor-FKBP51s expression and various PB-TAMs, specifically: CD169 (r = 0.32; P = 0.05), CD206 (r = 0.52; P = 0.001), CD206/FKBP51s (r = 0.55; P = 0.0005), PD-L1 (r = 0.48; P = 0.03), PD-L1/FKBP51s (r = 0.6; P = 0.0001), and Tregs (r = 0.57; P = 0.0003; Fig. 2D).