CD4 and neoplasm: Correlations of CD4, CD8, CD15, CD20, CD56, CD68, CD31 and PD-L1 on the expression of tumor and immune cells in non-muscle-invasive bladder cancer with patient age, histopathological malignancy (LG or HG tumors), the depth of bladder-wall invasion by the tumor and the diameter and number of tumor lesions were assessed.