BAY-958 (LDC526) is an orally active, ATP site-targeting, potent and selective PTEFb/CDK9 inhibitor (hCDK9-CycT1 IC50 = 5-11 nM; [ATP] = 10 μM) with 52- to >2000-fold selectivity over CDK1-7 with antiproliferative activity in cancer cultures (IC50 = 0.28 μM/96h/MOLM-13, 1 μM/96h/HeLa, 0.55 μM/48h/MEC-1, 0.28 μM/48h/CCL patient PBMCs). When administered orally in mice, BAY-958 significantly suppresses MOLM-13 acute myeloid leukemia (AML) tumor growth in mice (30/40 mg/kg/day p.o.; HCl salt) and exhibits in vivo efficacy in two murine chronic lymphocytic leukemia (CLL) models (50 & 70 mg/kg/day p.o.; free base).
Orally active, ATP site-targeting, potent and selective PTEFb/CDK9 inhibitor with anti-cancer efficacy in vitro and in vivo.
Selective inhibition of exclusively transcription-regulating PTEFb/CDK9 is a promising new approach in cancer therapy. Starting from lead compound BAY-958, lead optimization efforts strictly focusing on kinase selectivity, physicochemical and DMPK properties finally led to the identification of the orally available
Onset of progression even during therapy with novel drugs remains an issue in chronic lymphocytic leukemia (CLL). Thus, there is ongoing demand for novel agents. Approaches targeting cyclin-dependent kinases (CDK) have reached the clinical trial stage. CDK9 mediating RNA transcriptional
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