Local carboplatin delivery and tissue distribution in livers after radiofrequency ablation

A. Szymanski-Exner, A. Gallacher, N. T. Stowe, B. Weinberg, J. R. Haaga, J. Gao

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

This study investigated the local drug pharmacokinetics of intralesional drug delivery after radiofrequency ablation of the liver. We hypothesized that the tissue architecture damaged by the ablation process facilitates the drug penetration in the liver and potentially enlarges the therapeutic margin in the local treatment of cancer. The delivery rate and tissue distribution of carboplatin, an anticancer agent, released from poly(D,L-lactide-co-glycolide) implants into rat livers after radiofrequency ablation were quantified by atomic absorption spectroscopy. Results showed that carboplatin clearance through blood perfusion was significantly slower in the ablated livers, leading to a more extensive tissue retention and distribution of the drug. The concentration of Pt at the implant-tissue interface ranged from 234 to 1440 μg Pt/(g liver) in the ablated livers over 144 h versus 56 to 177 μg Pt/ (g liver) in the normal tissue. The maximum penetration distance at which Pt level reached above 6 μg/g (calculated based on a reported IC90 value for carboplatin) was 8-10 mm and 4-6 mm in ablated and normal liver, respectively. Histological analysis of the necrotic lesions showed widespread destruction of tissue structure and vasculature, supporting the initial hypothesis. This study demonstrated that intralesional drug delivery could provide a sustained, elevated concentration of anticancer drug at the ablation boundary that has the potential to eliminate residual cancer cells surviving radiofrequency ablation.

Original languageEnglish (US)
Pages (from-to)510-516
Number of pages7
JournalJournal of Biomedical Materials Research - Part A
Volume67
Issue number2
DOIs
StatePublished - Nov 1 2003

Keywords

  • Atomic absorption spectroscopy
  • Drug delivery
  • Pharmacokinetics
  • Radiofrequency ablation
  • Tissue distribution

ASJC Scopus subject areas

  • Ceramics and Composites
  • Biomaterials
  • Biomedical Engineering
  • Metals and Alloys

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