Additionally, PD-1 and CTLA4 levels were correlated with the degree of infiltration of CD4+ T cells in 33 and 33 cancer types, respectively; of B cells in 30 and 32 cancer types, respectively; of CD8+ T cells in 32 and 34 cancer types, respectively; of macrophages in 24 and 25 cancer types, respectively; of dendritic cells in 35 and 36 cancer types, respectively; and of neutrophils in 32 and 35 cancer types, respectively. Here, CD4 is linked to cancer.