© 2000 by Oxford University Press
Journal of the National Cancer Institute, Vol. 92, No. 17, 1434-1436,
September 6, 2000
© 2000 Oxford University Press
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Calvert's Formula for Dosing Carboplatin: Overview and Concerns of Applicability in High-Dose Setting
Affiliations of authors: M. Mazumdar, A. Smith (Department of Epidemiology and Biostatistics), W. P. Tong (Department of Therapeutic Pharmacology), R. J. Motzer (The Genitourinary Oncology Service, Division of Solid Tumor Oncology, Department of Medicine), Memorial Sloan-Kettering Cancer Center, New York, NY.
Correspondence to: Madhu Mazumdar, Ph.D., Department of Epidemiology and Biostatistics, Memorial Sloan-Kettering Cancer Center, 1275 York Ave., Box 44, New York, NY 10021 (e-mail: mazumdar@biost.mskcc.org).
The uniqueness of carboplatin as a chemotherapy drug is in the fact that the systemic drug exposure produced by any dose in a patient can be reasonably estimated on the basis of his or her renal function. Calvert's formula (1) of delivering a calculated dose in terms of target carboplatin area under the timeconcentration curve (AUC) and a measured or estimated glomerular filtration rate (GFR) has been widely used.
Here, we describe the derivation of Calvert's formula and point out some limitations in its development, including violation of an underlying assumption of linear regression theory. We also discuss the related published literature and recommend practicing caution in its use for a high-dose setting.
Calvert et al. (1) derived the dosage formula in three stages. Analysis at stage I involved a retrospective look at data from pharmacokinetic studies and
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