In vitro experiments demonstrated that the co-cultivation of GC cells with THP-1 used as a model for monocytes/macrophages, increased CCL5, MMP2, and MMP9 in THP-1 cells [98] and increased proliferation, clone-forming ability, and movement/migration in GC cells (also enhanced by exogenous CCL5) [98]. The gene discussed is MMP2; the disease is gastric cancer.