FOXP3 and neoplasm: PD-L1 IC ≥ 10% and CPS ≥ 10% was detected significantly more often in patients with high Foxp3+CD4+ T cells infiltration level in tumour tissue (100% 10/10 and 77.8% 14/18, p = 0.002, respectively) compared to patients with low Foxp3+CD4+ T cells infiltration level (48.4% 30/62, and 48.1% 26/64, p = 0.032, respectively).