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Radiology and Oncology

The Journal of Association of Radiology and Oncology

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1581-3207
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Volume 45, Issue 1 (Mar 2011)

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Electrogene therapy with interleukin-12 in canine mast cell tumors

Darja Pavlin
  • Veterinary Faculty Ljubljana, University of Ljubljana, Ljubljana, Slovenia
/ Maja Cemazar
  • Department of Experimental Oncology, Institute of Oncology Ljubljana, Ljubljana, Slovenia
  • College of Health Care Izola, University of Primorska, Izola, Slovenia
/ Andrej Cör
  • College of Health Care Izola, University of Primorska, Izola, Slovenia
/ Gregor Sersa
  • Department of Experimental Oncology, Institute of Oncology Ljubljana, Ljubljana, Slovenia
/ Azra Pogacnik
  • Veterinary Faculty Ljubljana, University of Ljubljana, Ljubljana, Slovenia
/ Natasa Tozon
  • Veterinary Faculty Ljubljana, University of Ljubljana, Ljubljana, Slovenia
Published Online: 2010-09-22 | DOI: https://doi.org/10.2478/v10019-010-0041-9

Electrogene therapy with interleukin-12 in canine mast cell tumors

Background. Mast cell tumors (MCT) are the most common malignant cutaneous tumors in dogs with extremely variable biological behaviour. Different treatment approaches can be used in canine cutaneous MCT, with surgical excision being the treatment of choice. In this study, electrogene therapy (EGT) as a new therapeutic approach to canine MCTs, was established.

Materials and methods. Eight dogs with a total of eleven cutaneous MCTs were treated with intratumoral EGT using DNA plasmid encoding human interleukin-12 (IL-12). The local response to the therapy was evaluated by repeated measurements of tumor size and histological examination of treated tumors. A possible systemic response was assessed by determination of IL-12 and interferon- γ (IFN-γ) in patients' sera. The occurence of side effects was monitored with weekly clinical examinations of treated animals and by performing basic bloodwork, consisting of the complete bloodcount and determination of selected biochemistry parameters.

Results. Intratumoral EGT with IL-12 elicits significant reduction of treated tumors' size, ranging from 13% to 83% (median 50%) of the initial tumor volume. Additionally, a change in the histological structure of treated nodules was seen. There was a reduction in number of malignant mast cells and inflammatory cell infiltration of treated tumors. Systemic release of IL-12 in four patients was detected, without any noticeable local or systemic side effects.

Conclusions. These data suggest that intratumoral EGT with plasmid encoding IL-12 may be useful in the treatment of canine MCTs, exerting a local antitumor effect.

Keywords: electroporation; electrotransfection; electrogene therapy; mast cell tumors; IL-12; IFN-γ

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About the article


Published Online: 2010-09-22

Published in Print: 2011-03-01


Citation Information: Radiology and Oncology, ISSN (Online) 1581-3207, ISSN (Print) 1318-2099, DOI: https://doi.org/10.2478/v10019-010-0041-9. Export Citation

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