FOXP3 and neoplasm: Tumours with positive PD-L1 IC expression were more likely to have high Foxp3+CD4+ T cell infiltration in tumour islets, as well as tumours with positive PD-L1 TPS, IC, or CPS were more likely to have low IL-17A+CD4+ T cell infiltration in the tumour stroma (Figure 1A–D, Table S1).