FADS2 was associated with infiltration levels of B cells in 19 cancer types, CD4 + T cells in 18 cancer types, CD8 + T cells in 18 cancer types, endothelial in 23 cancer types, macrophages cells in 20 cancer types, NK cells in 8 cancer types and CAFs in 30 cancer types according to the results of EPIC database (Fig. 7B). Here, CD4 is linked to cancer.