The densities and spatial interactions of CD8+ T cells, CD4+ T cells (CD4+FOXP3− T cells), CD4+FOXP3+ T cells, double‐negative T (DNT) cells, CD56+ cells (mainly nature killer cells), lineage− cells (immune lineage negative, DAPI+) and tumor cells were studied (Figure 1c), and examples of stratified cell phenotypes are shown in Figure 1d. The gene discussed is CD8A; the disease is neoplasm.