In addition, 12 immune cell types (naive and memory B cells, plasma cells, naive CD4 T cells, resting memory CD4 T cells, follicular helper T cells, activated natural killer (NK) cells, monocytes, M2 macrophages, resting and activated dendritic cells, and resting mast cells) were significantly different between the smoking and nonsmoking patients with lung cancer (Figure 4(c)). This evidence concerns the gene CD4 and lung cancer.