CD4 and neoplasm: The immune cells analyzed by the TIMER database include CD8+ T cells, CD4+ T cells, B cells, monocytes, tumor-associated macrophages (TAM), M1 and M2 macrophages, neutrophils, dendritic cells, and different subgroups of T cells, namely, T helper 1 (Th1), Th2, Tfh, Th17, regulatory T (Tregs), and T cell exhaustion.