miR-669 is involved in c-Myc expression through p53 [95], miR-500 regulates MET protooncogenes and affects NF-kB [96], miR-466 is involved in mammary tumor development, miR-466c is involved in tumor growth [95], miR-449a regulates breast cancer development and inhibits cell proliferation [71], [97], [98] and miR-Let7b plays a role in myeloid leukemia [99]. The gene discussed is TP53; the disease is neoplasm.