FOXP3 and neoplasm: Notably, the PD-L1 CPS was higher in tumor-infiltrating immune cells (r = 0.387, p = 0.001) and positively correlated with programmed cell death-1 (r = 0.443, p < 0.001) and forkhead box P3 + regulatory T cell (FOXP3 + Treg) infiltration (r = 0.532, p < 0.001), indicating a potential synergistic effect with FOXP3 + Treg and other infiltrating immune cells in supporting an adaptive immune response [69].