CDK2 and cancer: Other important oncogenic signaling pathways overactivated in cancers, such as glycogen synthase kinase 3β (GSK3β) [36,121,122], Ca2+/calmodulin-dependent protein kinase [123], ribosomal S6 kinase [124,125], protein kinases A and C [126,127,128,129,130], and the cyclin-dependent kinase pathway CDK1–CDK2–CCNA2 (cyclinA) [36,131] can also mediate C/EBP-β phosphorylation.