Furthermore, studies have shown that the chemotactic effects between CCL5, CCL9–10, CCL12, and T cells; CCL19, CCL21, and dendritic cells; CCL15 and B cells, which were found in the most enriched pathway associated with cytokine–cytokine receptor interaction, are ideal prospects applications tumor-specific immunotherapy [55, 56]. Here, CCL21 is linked to neoplasm.