Novel nanoliposomal CPT-11 infused by convection-enhanced delivery in intracranial tumors: Pharmacology and efficacy

Charles O. Noble, Michal T. Krauze, Daryl C. Drummond, Yoji Yamashita, Ryuta Saito, Mitchel S. Berger, Dmitri B. Kirpotin, Krystof S. Bankiewicz, John W. Park

Research output: Contribution to journalArticle

128 Citations (Scopus)

Abstract

We hypothesized that combining convection-enhanced delivery (CED) with a novel, highly stable nanoparticle/liposome containing CPT-11 (nanoliposomal CPT-11) would provide a dual drug delivery strategy for brain tumor treatment. Following CED in rat brains, tissue retention of nanoliposomal CPT-11 was greatly prolonged, with >20% injected dose remaining at 12 days for all doses. Tissue residence was dose dependent, with doses of 60 μg(3 mg/mL), 0.8 mg (40 mg/mL), and 1.6 mg (80 mg/mL) resulting in tissue half-life (t 1/2) of 6.7, 10.7, and 19.7 days, respectively. In contrast, CED of free CPT-Il resulted in rapid drug clearance (tissue t1/2 = 0.3 day). At equivalent CED doses, nanoliposomal CPT-11 increased area under the time-concentration curve by 25-fold and tissue t1/2 by 22-fold over free CPT-11; CED in intracranial U87 glioma xenografts showed even longer tumor retention (tissue t1/2 = 43 days). Plasma levels were undetectable following CED of nanoliposomal CPT-11. Importantly, prolonged exposure to nanoliposomal CPT-11 resulted in no measurable central nervous system (CNS) toxicity at any dose tested (0.06-1.6 mg/rat), whereas CED of free CPT-11 induced severe CNS toxicity at 0.4 mg/rat. In the intracranial U87 glioma xenograft model, a single CED infusion of nanoliposomal CPT-11 at 1.6 mg resulted in significantly improved median survival (>100 days) compared with CED of control liposomes (19.5 days; P = 4.9 × 105) or free drug (28.5 days; P = 0.011). We conclude that CED of nanoliposomal CPT-11 greatly prolonged tissue residence while also substantially reducing toxicity, resulting in a highly effective treatment strategy in preclinical brain tumor models.

Original languageEnglish
Pages (from-to)2801-2806
Number of pages6
JournalCancer Research
Volume66
Issue number5
DOIs
Publication statusPublished - 2006 Mar 1
Externally publishedYes

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

Fingerprint Dive into the research topics of 'Novel nanoliposomal CPT-11 infused by convection-enhanced delivery in intracranial tumors: Pharmacology and efficacy'. Together they form a unique fingerprint.

  • Cite this

    Noble, C. O., Krauze, M. T., Drummond, D. C., Yamashita, Y., Saito, R., Berger, M. S., Kirpotin, D. B., Bankiewicz, K. S., & Park, J. W. (2006). Novel nanoliposomal CPT-11 infused by convection-enhanced delivery in intracranial tumors: Pharmacology and efficacy. Cancer Research, 66(5), 2801-2806. https://doi.org/10.1158/0008-5472.CAN-05-3535