Analysis of the expression changes in lymphocyte subsets between GC patients and the healthy control group revealed that the absolute numbers of CD3+ T cells, CD4+ T cells, CD8+ T cells, CD19+ B cells, and lymphocytes were lower in the GC group compared to the healthy control group (Figs. 4A–4F, expressed as mean ± SEM). This evidence concerns the gene CD4 and gastric cancer.