title: Plasma free platinum pharmacokinetics in patients treated with high dose carboplatin.
abstract: Plasma free platinum (less than 50,000 mol. wt) pharmacokinetics have been studied in eight patients treated with high-dose (800-1600 mg/m2) carboplatin as a 1 h infusion with moderate hydration. Following the infusion, levels decayed biphasically with half-lives (means +/- S.D.) of 83 +/- 15 min and 6.1 +/- 2.8 h. The plasma free platinum area under the concentration vs. time curve (AUC) at 1600 mg/m2 in five patients was 23 +/- 2 mg carboplatin/ml.min. Comparison with data at conventional doses (less than or equal to 500 mg/m2) gave no indication of non-linear kinetics. Total body clearance of free platinum was found to correlate with glomerular filtration rate (r = 0.769, P = 0.03), and haematological toxicity, white cell nadir and duration of thrombocytopenia, correlated with plasma free platinum AUC (r = 0.784, P = 0.02 and r = 0.885, P = 0.01, respectively). Persistence of platinum was demonstrated in tissues removed at autopsy from a patient who had received carboplatin 14 days earlier. Highest platinum levels were found in the liver, kidney, skin and small cell lung tumour.
authors.affiliation: Drug Development Section, Institute of Cancer Research, Sutton, Surrey, U.K.
authors.forename: D R
authors.initials: DR
authors.lastname: Newell
authors.forename: Z H
authors.initials: ZH
authors.lastname: Siddik
authors.forename: L A
authors.initials: LA
authors.lastname: Gumbrell
authors.forename: F E
authors.initials: FE
authors.lastname: Boxall
authors.forename: M E
authors.initials: ME
authors.lastname: Gore
authors.forename: I E
authors.initials: IE
authors.lastname: Smith
authors.forename: A H
authors.initials: AH
authors.lastname: Calvert
mesh_terms: D000328:Adult; D000368:Aged; D000970:Antineoplastic Agents / Q000008:administration & dosage* / Q000627:therapeutic use; D016190:Carboplatin; D005260:Female; D005919:Glomerular Filtration Rate; D006801:Humans; D007970:Leukopenia / Q000139:chemically induced; D008175:Lung Neoplasms / Q000097:blood / Q000188:drug therapy; D008297:Male; D008875:Middle Aged; D009944:Organoplatinum Compounds / Q000008:administration & dosage* / Q000627:therapeutic use; D010984:Platinum / Q000097:blood* / Q000493:pharmacokinetics
chemical_list: D000970:Antineoplastic Agents; D009944:Organoplatinum Compounds; D010984:Platinum; D016190:Carboplatin