C–C Motif Chemokine Ligand 19 (CCL19) is a chemokine, and its upregulation inhibits GC cell proliferation and tumor growth by upregulating the C–C Motif Chemokine Receptor 7 (CCR7)/AIM2 axis, while silencing AIM2 abrogates the effects of CCL19 on tumor growth [255]. The gene discussed is CCL19; the disease is neoplasm.