Abstract
The in vitro metabolism of cediranib (4-[(4-fluoro-2-methyl-1H-indol-5-yl)oxy]-6-methoxy-7-[3-(1-pyrrolidinyl)propoxy]quinazoline), a vascular endothelial growth factor (VEGF) tyrosine kinase inhibitor (TKI) of all three VEGF receptors in late-stage development for the treatment of colorectal cancer and recurrent glioblastoma was investigated in hepatic proteins from preclinical species and humans using radiolabeled material. In human hepatocyte cultures, oxidative and conjugative metabolic pathways were identified, with pyrrolidine N(+)-glucuronidation being the major route. The primary oxidative pathways were di-and trioxidations and pyrrolidine N-oxidation. All metabolites with the exception of the N(+)-glucuronide metabolite were observed in rat and cynomolgus monkey hepatocyte preparations. Additional metabolism studies in liver microsomes from these or other preclinical species (CD-1 mouse, Han Wistar rat, Dunkin Hartley guinea pig, Göttingen mini-pig, New Zealand White rabbit, beagle dog, and cynomolgus and rhesus monkey) indicated that the N(+)-glucuronide metabolite was not formed in these additional species. Incubations with recombinant flavin-containing monooxygenase (FMO) and UDP-glucuronosyltransferase (UGT) enzyme...Continue Reading
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