Researchers at Dana-Farber Cancer Institute Inc., Memorial Hospital for Cancer and Allied Diseases, Memorial Sloan Kettering Cancer Center and Stevens Institute of Technology have divulged proteolysis targeting chimeras (PROTACs) comprising an E3 ubiquitin ligase-binding moiety linked to cyclin-dependent kinase 4 (CDK4) and/or 6 (CDK6)-targeting moiety through a linker.