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Palbociclib (PD 0332991) dihydrochloride is an orally active, selective inhibitor of CDK4 (IC50: 11 nM) and CDK6 (IC50: 16 nM). Palbociclib dihydrochloride has anti-proliferative activity and cell cycle arrest in HR-positive and HER2-negative breast cancers, as well as in hepatocellular carcinoma studies.