Chen et al. demonstrated that SNHG15 could regulate cell proliferation by acting on MMP (matrix metallopeptidase)2 and (matrix metallopeptidase 9) MMP9 in gastric cancer cells, but the potential mechanisms of actions of SNHG15 and MMP2/MMP9 have not been explored [19]. The gene discussed is SNHG15; the disease is gastric cancer.