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  • An orally bioavailable formulation of azacitidine, a pyrimidine nucleoside analogue of cytidine, with antineoplastic activity. Upon oral administration, azacitidine is taken up by cells and metabolized to 5-azadeoxycitidine triphosphate. The incorporation of 5-azadeoxycitidine triphosphate into DNA reversibly inhibits DNA methyltransferase, and blocks DNA methylation. Hypomethylation of DNA by azacitidine may re-activate tumor suppressor genes previously silenced by hypermethylation, resulting in an antitumor effect. In addition, the incorporation of 5-azacitidine triphosphate into RNA disrupts normal RNA function and impairs tRNA (cytosine-5)-methyltransferase activity, resulting in an inhibition of RNA and protein synthesis.
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