It was positively correlated with CD4+ Th2 cells in BLCA (rho = 0.24), as well as CD4+ T cells and regulatory T cells (Tregs) in CESC (rho = 0.25), CD4+ effector memory T cells in KIRC (rho = 0.30), CD4+ T cells in LUAD (rho = 0.26). Here, CD4 is linked to bladder transitional cell carcinoma.