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Intratumoral injection of BCNU in ethanol (DTI-015) results in enhanced delivery to tumor – a pharmacokinetic study

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Summary

Solvent facilitated perfusion (SFP) has been proposed as a technique to increase the delivery of chemotherapeutic agents to tumors. SFP entails direct injection of the agent into the tumor in a water-miscible organic solvent, and because the solvent moves easily through both aqueous solutions and cellular membranes it drives the penetration of the solubilized anticancer agent throughout the tumor. To test this hypothesis, we compared the pharmacokinetics (PK) of 14C-labeled 1,3-bis-chlorethyl-1-nitrosourea (BCNU) in intra-cerebral 9L rat gliomas after intravenous (IV) infusion in 90% saline –10% ethanol or direct intratumoral (IT) injection of 14C-BCNU in 100% ethanol (DTI-015). Treatment with DTI-015 yielded a peak radioactive count (Cmax) for the 14C label that was 100–1000 fold higher in the tumor than in all other tissues in addition to a concentration in the tumor that was 100-fold higher than that achieved following IV infusion of 14C-BCNU. Pathologic and auto-radiographic analysis of tissue sections following IT injection of 14C-BCNU in ethanol into either tumor or normal rat brain revealed both an enhanced local volume of distribution and an increased concentration of BCNU delivered to tumor compared to non-tumor bearing brain. To investigate the mechanism behind the SFP of BCNU to the tumor both dynamic contrast and perfusion MRI were performed on 9L tumors before and after treatment and demonstrated a decrease in tumor perfusion following IT injection of DTI-015. Finally, initial PK of patient blood samples following administration of DTI-015 into relapsed high-grade glioma indicated a 20-fold decrease in systemic exposure to BCNU compared to IV infusion of BCNU providing further evidence for the enhanced therapeutic ratio observed for DTI-015.

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Abbreviations

AUC:

area under the concentration–time curve

BCNU:

1,3-bis-chlorethyl-1-nitrosourea

CED:

convection enhanced delivery

Cmax:

peak concentration

CPM:

counts per minute

DTI-015:

BCNU prepared in 100% ethanol

IT:

intratumoral

IV:

intravenous

LD10:

the dose of drug which results in death of 10% of the animals due to drug toxicity

MRI:

magnetic resonance imaging

PK:

pharmacokinetics

SEM:

standard error of the mean

SFP:

solvent facilitated perfusion

t 1/2 :

half-life

TTR:

tumor-to-tissue ratio

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Hamstra1, D.A., Moffat, B.A., Hall, D.E. et al. Intratumoral injection of BCNU in ethanol (DTI-015) results in enhanced delivery to tumor – a pharmacokinetic study. J Neurooncol 73, 225–238 (2005). https://doi.org/10.1007/s11060-004-5675-2

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  • DOI: https://doi.org/10.1007/s11060-004-5675-2

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