CD4 and prostate adenocarcinoma: In PRAD, LCN2 expression negatively correlated with tumor purity(r = −0.39, P = 1.38e-16) and positively correlated with CD4+ T cells (r = 0.288, P = 2.62e-09), macrophages (r = 0.114, P = 2.00e-02), neutrophils (r = 0.275, P = 1.20e-08), and dendritic cells (r = 0.142, P = 3.82e-03).