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Published in: Molecular Imaging and Biology 3/2020

Open Access 01-06-2020 | Positron Emission Tomography | Research Article

Longitudinal PET Imaging to Monitor Treatment Efficacy by Liposomal Irinotecan in Orthotopic Patient-Derived Pancreatic Tumor Models of High and Low Hypoxia

Authors: Manuela Ventura, Nicholas Bernards, Raquel De Souza, Inga B. Fricke, Bart S. Hendriks, Jonathan B. Fitzgerald, Helen Lee, Stephan G. Klinz, Jinzi Zheng

Published in: Molecular Imaging and Biology | Issue 3/2020

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Abstract

Purpose

Hypoxia is linked to aggressiveness, resistance to therapy, and poor prognosis of pancreatic tumors. Liposomal irinotecan (nal-IRI, ONIVYDE®) has shown potential in reducing hypoxia in the HT29 colorectal cancer model, and here, we investigate its therapeutic activity and ability to modulate hypoxia in patient-derived orthotopic tumor models of pancreatic cancer.

Procedures

Mice were randomized into nal-IRI treated and untreated controls. Magnetic resonance imaging was used for monitoring treatment efficacy, positron emission tomography (PET) imaging with F-18-labelled fluoroazomycinarabinoside ([18F]FAZA) for tumor hypoxia quantification, and F-18-labelled fluorothymidine ([18F]FLT) for tumor cell proliferation.

Results

The highly hypoxic OCIP51 tumors showed significant response following nal-IRI treatment compared with the less hypoxic OCIP19 tumors. [18F]FAZA-PET detected significant hypoxia reduction in treated OCIP51 tumors, 8 days before significant changes in tumor volume. OCIP19 tumors also responded to therapy, although tumor volume control was not accompanied by any reduction in [18F]FAZA uptake. In both models, no differences were observable in [18F]FLT uptake in treated tumors compared with control mice.

Conclusions

Hypoxia modulation may play a role in nal-IRI’s mechanism of action. Nal-IRI demonstrated greater anti-tumor activity in the more aggressive and hypoxic tumor model. Furthermore, hypoxia imaging provided early prediction of treatment response.
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Metadata
Title
Longitudinal PET Imaging to Monitor Treatment Efficacy by Liposomal Irinotecan in Orthotopic Patient-Derived Pancreatic Tumor Models of High and Low Hypoxia
Authors
Manuela Ventura
Nicholas Bernards
Raquel De Souza
Inga B. Fricke
Bart S. Hendriks
Jonathan B. Fitzgerald
Helen Lee
Stephan G. Klinz
Jinzi Zheng
Publication date
01-06-2020
Publisher
Springer International Publishing
Published in
Molecular Imaging and Biology / Issue 3/2020
Print ISSN: 1536-1632
Electronic ISSN: 1860-2002
DOI
https://doi.org/10.1007/s11307-019-01374-x

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