CD4 and bladder transitional cell carcinoma: A weak positive correlation (P < 0.05) existed between RNASEK expression and various immune cell infiltrations such as B cells, CD8+ T-cells, CD4+ T-cells, macrophages, neutrophils, and dendritic cells in patients with BLCA, ESCA, HNSC, and LIHC, while THCA presented moderate negative correlations with CD4+ T-cells and neutrophils.