On the one hand, altered MYBL2 expression can arise from chr20q13 amplification, which is described for several cancer entities, for example, breast cancer, colorectal cancer and ovarian cancer.94, 95, 96 On the other hand, it can be caused by deregulation of DREAM complex assembly, for example, due to p53 mutation or transformation by the HPV16 E7 oncogene and thereby uncoupling MYBL2 expression from negative transcriptional regulation and enabling MYBL2 to increasingly bind to MuvB and FOXM1 (see below). This evidence concerns the gene MYBL2 and breast cancer.