A novel lncRNA gene MEF2C antisense RNA 1 (MEF2C-AS1), located at 5q14.3, has been identified to be downregulated and to play tumor suppressor roles in diffuse gastric cancer (DGC), cervical cancer (CC), and BC by inhibiting cell proliferation and aggressive tumor phenotypes [27–29]. The gene discussed is MEF2C; the disease is neoplasm.