Dinaciclib (SCH 727965, Merck) is a pyrazolo [1,5-α]pyrimidine that potently inhibits CDK1, CDK2, CDK5, and CDK9 (Parry et al., 2010; Paruch et al., 2010) with IC50 values ranging from 1 to 4 nM in a broad spectrum of human cancer cell lines including MCL, NHL, leukemia, colon, pancreatic, breast, prostate, SCLC, liver, and bladder (Parry et al., 2010). This evidence concerns the gene CDK1 and leukemia.