Eight miRNAs (miR-101, miR-107, miR-122, miR-29, miR-365, miR-375, miR-378, and miR-802), whose expression was found to be downregulated in c-Myc and/or AKT/Ras liver tumors, were selected and their tumor suppressor activity was assessed in c-Myc and AKT/Ras mice. The gene discussed is MYC; the disease is neoplasm.