There were no significant differences in the spatial locations of PDL1 + TAMs (PD–L1 + CD68 + cells), or regulatory T cells (Tregs) (FOXP3 + CD4 + cells and PD–L1 + FOXP3 + CD4 + cells) in ARID1A mutant tumours, however (Supplementary Table S9). Here, FOXP3 is linked to neoplasm.