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- W1996983864 abstract "<i>Background:</i> Gefitinib competes with topoisomerase I inhibitors at drug efflux pumps in vitro. We evaluated the effects of oral gefitinib on pharmacokinetic parameters of orally coadministered irinotecan. <i>Methods:</i> We measured the serum pharmacokinetic parameters and biliary excretion of irinotecan, SN-38 and its glucuronide after irinotecan (50 or 100 mg/kg) was orally administered with or without gefitinib 100 mg/kg to rats. We measured the concentrations of irinotecan and SN-38 in the small intestine, liver, lungs and kidneys in each rat. <i>Results:</i> The plasma area under the curve (0–24 h) of irinotecan and SN-38 was increased significantly, while the apparent elimination constant of irinotecan was decreased significantly. Gefitinib significantly increased the biliary cumulative amounts of irinotecan, but not of SN-38, and also influenced the enterohepatic circulation of irinotecan, but not of SN-38. <i>Conclusions:</i> Gefitinib increased the serum concentrations of irinotecan and SN-38 following oral administration of irinotecan without increasing the biliary excretion of SN-38 in vivo." @default.
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- W1996983864 date "2008-01-01" @default.
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- W1996983864 title "Gefitinib Increases Serum Concentrations of Oral Irinotecan and SN-38 without Increasing the Biliary Concentration of SN-38 in Rats" @default.
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- W1996983864 doi "https://doi.org/10.1159/000159625" @default.
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