title: The disposition of carboplatin in the beagle dog.
abstract: Carboplatin was administered i.v. to four groups of three male beagle dogs at doses of 3, 6, 12, and 24 mg/kg (60-580 mg/m2). Plasma samples were obtained at appropriate times and protein-free plasma ultrafiltrates (PU) were generated with Amicon Centrifree micropartition systems. Urine was collected at 24-h intervals for 96 h. PU and urine samples were analyzed for carboplatin by HPLC and for total platinum by atomic absorption spectrophotometry. Carboplatin accounted for about 90% of the free platinum in plasma. The Cmax and AUCinf values for carboplatin and for free platinum increased linearly with dose. The terminal elimination half-life and mean residence times for carboplatin and free platinum were each about 1 h. Total-body clearances for carboplatin (5.6 l/h per m2) and free platinum (5.1 l/h per m2) were constant over the dose range studied, as were the respective volumes of distribution (5.7 and 5.0 l/m2). A mean of 46% of the dose was excreted as carboplatin in 24-h urine; and by 72 h, 70% of the platinum administered was excreted in the urine. Free platinum was cleared by both renal and non-renal processes. These results show that a dose of carboplatin is rapidly excreted in the urine and that carboplatin and plasma-free platinum exhibit linear pharmacokinetics in the beagle dog.
authors.affiliation: Department of Metabolism and Pharmacokinetics, Bristol-Myers Company, Syracuse, New York 13221-4755.
authors.forename: R C
authors.initials: RC
authors.lastname: Gaver
authors.forename: A M
authors.initials: AM
authors.lastname: George
authors.forename: G F
authors.initials: GF
authors.lastname: Duncan
authors.forename: A D
authors.initials: AD
authors.lastname: Morris
authors.forename: G
authors.initials: G
authors.lastname: Deeb
authors.forename: H C
authors.initials: HC
authors.lastname: Faulkner
authors.forename: R H
authors.initials: RH
authors.lastname: Farmen
mesh_terms: D000818:Animals; D016190:Carboplatin; D002851:Chromatography, High Pressure Liquid; D004285:Dogs / Q000378:metabolism*; D006207:Half-Life; D008297:Male; D008657:Metabolic Clearance Rate; D009944:Organoplatinum Compounds / Q000097:blood / Q000493:pharmacokinetics* / Q000652:urine; D014018:Tissue Distribution
chemical_list: D009944:Organoplatinum Compounds; D016190:Carboplatin