ACE2 expression was significantly correlated with: macrophages infiltration levels in 13 types of cancers; dendritic cells in 12 types of cancers; CD4+ T cells in eight types of cancers; CD8+ T cells in three types of cancers; mast cells in eight types of cancers; B cells in five types of cancers; and NK cells in two types of cancers (Figure 7). This evidence concerns the gene CD4 and cancer.