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- W2012912125 abstract "Regorafenib is a novel multikinase inhibitor, currently approved for the treatment of metastasized colorectal cancer and advanced gastrointestinal stromal tumors. We investigated whether regorafenib is a substrate for the multidrug efflux transporters ABCG2 and ABCB1 and whether oral availability, brain and testis accumulation of regorafenib and its active metabolites are influenced by these transporters. We used in vitro transport assays to assess human (h)ABCB1- or hABCG2- or murine (m)Abcg2-mediated active transport at high and low concentrations of regorafenib. To study the single and combined roles of Abcg2 and Abcb1a/1b in oral regorafenib disposition and the impact of Cyp3a-mediated metabolism, we used appropriate knockout mouse strains. Regorafenib was transported well by mAbcg2 and hABCG2 and modestly by hABCB1 in vitro. Abcg2 and to a lesser extent Abcb1a/1b limited brain and testis accumulation of regorafenib and metabolite M2 (brain only) in mice. Regorafenib oral availability was not increased in Abcg2 -/- ;Abcb1a/1b -/- mice. Up till 2 h, metabolite M5 was undetectable in plasma and organs. Brain and testis accumulation of regorafenib and brain accumulation of metabolite M2 are restricted by Abcg2 and Abcb1a/1b. Inhibition of these transporters may be of clinical relevance for patients with brain (micro)metastases positioned behind an intact blood–brain barrier." @default.
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- W2012912125 date "2015-01-08" @default.
- W2012912125 modified "2023-10-17" @default.
- W2012912125 title "Brain and Testis Accumulation of Regorafenib is Restricted by Breast Cancer Resistance Protein (BCRP/ABCG2) and P-glycoprotein (P-GP/ABCB1)" @default.
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- W2012912125 doi "https://doi.org/10.1007/s11095-014-1609-7" @default.
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