Yet, highly specific CDK2 inhibitors are lacking, but several more or less specific CDK inhibitors have already been in clinical trials for cancer treatment.122, 123 Also, several inhibitors interfering with players of the downstream transcriptional network of MYBL2, such as inhibitors against Aurora kinases,124 FGF receptors,125 Kinesins,126 Bcl-2127 and BIRC5 (Survivin)128 have already been in clinical trials and may serve as an effective, more specific and less toxic future anti-cancer therapy in cancers highly expressing MYBL2. This evidence concerns the gene BIRC5 and cancer.