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Factors causing dose variability in drug administration.

R Demicheli1, A Jirillo, G Bonciarelli

  • 1Division of Radiotherapy and Oncology, ULSS 28, Legnago (VR), Italy.

Cancer Chemotherapy and Pharmacology
|January 1, 1989
PubMed
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Cancer drug dosing variability was analyzed, revealing systematic and random reductions in delivered doses. Accurate dose personalization and awareness of drug residuum are crucial for effective cancer patient treatment.

Area of Science:

  • Oncology
  • Pharmaceutical Sciences
  • Clinical Pharmacy

Background:

  • Accurate drug dosing is critical in cancer therapy to optimize efficacy and minimize toxicity.
  • Variability in drug administration can arise from multiple procedural and technical factors in clinical settings.

Purpose of the Study:

  • To quantitatively analyze the variability of drug doses administered to cancer patients.
  • To identify and measure the impact of specific factors contributing to dose variability.

Main Methods:

  • Experimental measurement of variability introduced by body surface area calculation.
  • Quantitative assessment of variability in personalized dose calculations.
  • Measurement of drug residuum in commercially available vials.

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Main Results:

  • Demonstrated a systematic dose reduction, averaging 7% (range 2%-15%).
  • Identified a random variability component of 4%-5% in the delivered drug dose.
  • Highlighted routine clinical procedures as significant contributors to actual delivered drug amounts.

Conclusions:

  • Emphasized the need for highly accurate measurement and calculation in personalized cancer drug dosing.
  • Stressed the importance of informing healthcare staff about drug residuum to improve accuracy.
  • Warned that dose variability can lead to misclassification in dose-response relationship studies.