MDM4 and malignant colon neoplasm: MDM4/ MDM2 double knockdown with siRNAs enhanced 5-fluorouracil (5-FU)-induced p53 activation, arrested cell cycle at G1 phase, and potentiated the antitumor effect of 5-FU in wtTP53/highMDM4 human colon cancer cells (Imanishi et al., 2019[10]).