Flat dosing of carboplatin is justified in adult patients with normal renal function

Corine Ekhart, Milly E. De Jonge, Alwin D.R. Huitema, Jan H.M. Schellens, Sjoerd Rodenhuis, Jos H. Beijnen

Onderzoeksoutput: Bijdrage aan tijdschriftArtikelpeer review

48 Citaten (Scopus)


Purpose: The Calvert formula is a widely applied algorithm for the a priori dosing of carboplatin based on patients glomerular filtration rate (GFR) as accurately measured using the 51Cr-EDTA clearance. Substitution of the GFR in this formula by an estimate of creatinine clearance or GFR as calculated by formulae using serum creatinine (SCR; Cockcroft-Gault, Jelliffe, and Wright) is, however, routine clinical practice in many hospitals. The goal of this study was to validate this practice retrospectively in a large heterogeneous adult patient population. Experimental Design: Concentration-time data of ultrafilterable platinum of 178 patients (280 courses, 3,119 samples) with different types of cancer receiving carboplatin-based chemotherapy in conventional and high doses were available. Data were described with a linear two-compartment population pharmacokinetic model. Relations between S CR-based formulae for estimating renal function and carboplatin clearance were investigated. Results: None of the tested SCR-based estimates of renal function were relevantly related to the pharmacokinetic variables of carboplatin. Neither SCR (median, 51; range, 18-124 μmol/L) nor the estimated GFR using the three different formulae was related to carboplatin clearance. Conclusions: Our data do not support the application of modifications of the Calvert formula by estimating GFR from SCR in the a priori dosing of carboplatin in patients with relatively normal renal function (creatinine clearance, >50 mL/min). For targeted carboplatin exposures, the original Calvert formula, measuring GFR using the 51Cr-EDTA clearance, remains the method of choice. Alternatively, in patients with normal renal function, a flat dose based on the mean population carboplatin clearance should be administered.

Originele taal-2Engels
Pagina's (van-tot)6502-6508
Aantal pagina's7
TijdschriftClinical Cancer Research
Nummer van het tijdschrift21
StatusGepubliceerd - 1 nov. 2006
Extern gepubliceerdJa


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