Related Experiment Videos
Population pharmacokinetics of carboplatin in children
E Chatelut1, A V Boddy, B Peng
1Centre Claudius Regaud, Toulouse, France.
Insights
This study developed a formula to predict carboplatin clearance in pediatric patients, reducing variability. The new model accounts for weight, serum creatinine, and nephrectomy, improving pharmacokinetic accuracy for children receiving chemotherapy.
Area of Science:
- Pediatric Oncology
- Pharmacokinetics
- Nephrology
Background:
- Carboplatin dosing in children by body surface area leads to significant variability in exposure.
- Understanding factors influencing carboplatin clearance is crucial for optimizing pediatric cancer treatment.
Purpose of the Study:
- To develop a population pharmacokinetic model for ultrafilterable carboplatin in pediatric patients.
- To identify covariates affecting carboplatin clearance and create a predictive formula.
Main Methods:
- A population pharmacokinetic analysis was conducted using the NONMEM program.
- Data from 57 pediatric patients (2 months to 18 years) with varying serum creatinine levels were analyzed.
- Carboplatin pharmacokinetics were assessed in plasma samples.
Main Results:
- A predictive formula for carboplatin clearance was established, incorporating weight, serum creatinine, and unilateral nephrectomy status.
- The formula significantly reduced interindividual variability in clearance from 74% to 29%.
- Weight alone reduced variability to 49%, highlighting its importance.
Conclusions:
- The developed formula offers improved prediction of carboplatin clearance in children.
- Prospective evaluation and comparison with glomerular filtration rate-based methods are recommended.
- This model may aid in more precise carboplatin dosing for pediatric cancer patients.
Objectives:
In pediatric patients, administration of carboplatin according to body surface area results in a large variation in the area under the plasma ultrafilterable carboplatin concentration versus time curve. A population pharmacokinetic study using the NONMEM program was undertaken to determine the effects of a variety of covariates on the clearance of ultrafilterable carboplatin.
Patients:
Plasma carboplatin pharmacokinetics were determined in 57 children (2 months to 18 years old, with serum creatinine levels ranging from 27 to 268 mumol/L) treated for various tumor types.
Results:
The best fit corresponded to the formula: clearance (ml/min) = 2.85.weight.(1-0.00357.serum creatinine).(1-0.372.Np) + 8.7 (with serum creatinine in micromoles per liter, weight in kilograms, and Np = 1 or 0 for unilateral nephrectomy or not, respectively). The interindividual variability in clearance, as expressed by the coefficient of variation, decreased from 74% (no covariates) to 49% by taking account of weight, and to 29% under the final regression formula.
Conclusion:
The ability of this formula to predict carboplatin clearance in children should be evaluated prospectively and compared to a method based on the determination of the glomerular filtration rate.