Annals of Oncology 15:291-295, 2004
© 2004 European Society for Medical Oncology
Original Paper |
Evaluation of the Cockroft–Gault, Jelliffe and Wright formulae in estimating renal function in elderly cancer patients
Received 17 March 2003; revised 15 October 2003; accepted 6 November 2003Background:
More elderly patients are being treated with chemotherapy. Reliable and accurate measures of renal function are needed to obtain predictable, safe and effective exposure to renally excreted drugs. The Jelliffe, Cockroft–Gault and Wright formulae have been used to evaluate renal function, although they have not been validated in elderly oncology patients. We performed a retrospective evaluation of these formulae using the [51Cr]-ethylenediamine tetraacetic acid ([51Cr]-EDTA) method of measuring glomerular filtration rate (GFR) as the ‘gold standard’.
Patients and methods:
Inclusion criteria were age 
70 years and serum creatinine <250 µmol/l, performed within 4 weeks of glomerular filtration rate (GFR) measurement. Creatinine clearance was calculated using the Cockroft–Gault, Jelliffe and Wright formulae. The precision and accuracy of the three formulae were compared with the gold standard.
Results:
Two hundred and twenty-five patients were evaluated: median age, 74 years (range 70–89); males, 108; females, 117; median creatinine, 84 µmol/l (range 44–186). Correlation coefficients of the Jelliffe, Cockroft–Gault and Wright formulae were similar. In the specific GFR ranges of 50–70, 70–90 and 90–120 ml/min, the bias [mean percentage error (MPE)] was +8%, –4% and –13%, respectively. The degree of bias was greater with the Cockroft–Gault and Jelliffe formulae across the same range of GFR with the MPE being –15%, –25%, –32% and –12%, –19% and –23%, respectively. All three formulae have reduced precision and greater bias at the extremes of GFR.
Conclusions:
The Wright formula is the most accurate, precise and least biased formula for the calculation of GFR in elderly patients with a GFR >50 ml/min. These results allow the physician to make a decision regarding the use of the formula based on an expected degree of bias.
Guys and St Thomas’ Hospitals, Medical Oncology Department, Guy’s Hospital, London SE19RT, UK
Key words: Cockroft and Gault, elderly, Jelliffe, renal function, Wright
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