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Published in: European Radiology 4/2015

01-04-2015 | Experimental

Magnetic resonance-imaging of the effect of targeted antiangiogenic gene delivery in a melanoma tumour model

Authors: Walter Hundt, Silke Steinbach, Dirk Mayer, Mykhaylo Burbelko, Andreas Kiessling, Jens Figiel, Samira Guccione

Published in: European Radiology | Issue 4/2015

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Abstract

Objectives

We investigated the effect of targeted gene therapy to melanoma tumours (M21) by MR-imaging.

Methods

M21 and M21-L tumours were grown to a size of 850 mm3. M21 and M21-L tumours were intravenously treated with an αvβ3-integrin-ligand-coupled nanoparticle (RGDNP)/RAF(-) complex five times every 72 hours. MRI was performed at set time intervals 24h and 72h after the i.v. injection of the complex. The MRI protocol was T1-wt-SE±CM, T2-wt-FSE, DCE-MRI, Diffusion-wt-STEAM-sequence, T2-time obtained on a 1.5-T-GE-MRI device.

Results

The size of the treated M21 tumours kept nearly constant during the treatment phase (847.8±31.4 mm3 versus 904.8±44.4 mm3). The SNR value (T2-weighted images) of the tumours was 36.7±0.6 and dropped down to 30.6±1.9 (p=0.004). At the beginning the SNR value (T1-weighted images) of the tumours after contrast medium application was 42.3±1.9 and dropped down to 28.5±3.0 (p<0.001). In the treatment group the diffusion coefficient increased significantly under therapy (0.54±0.01x10-3 mm2/s versus 0.67±0.04x10-3 mm2/s). The DCE-MRI showed a reduction of the slope and of the Akep of 67.8±4.3 % respectively 64.8±3.3 % compared to baseline.

Conclusions

Targeted gene delivery therapy induces significant changes in MR-imaging. MRI showed a significant reduction of contrast medium uptake parameters and increase of the diffusion coefficient of the tumours.

Key point

• Treatment with targeted gene-delivery therapy can be monitored by MR imaging
• DCE and diffusion-weighted imaging are appropriate methods for monitoring this therapy
• Functional changes are significant prior to any morphological changes
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Metadata
Title
Magnetic resonance-imaging of the effect of targeted antiangiogenic gene delivery in a melanoma tumour model
Authors
Walter Hundt
Silke Steinbach
Dirk Mayer
Mykhaylo Burbelko
Andreas Kiessling
Jens Figiel
Samira Guccione
Publication date
01-04-2015
Publisher
Springer Berlin Heidelberg
Published in
European Radiology / Issue 4/2015
Print ISSN: 0938-7994
Electronic ISSN: 1432-1084
DOI
https://doi.org/10.1007/s00330-014-3492-3

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