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Electrical resistance of human soft tissue sarcomas: an ex vivo study on surgical specimens

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Abstract

This paper presents a study about electrical resistance, which using fixed electrode geometry could be correlated to the tissue resistivity, of different histological types of human soft tissue sarcomas measured during electroporation. The same voltage pulse sequence was applied to the tumor mass shortly after surgical resection by means of a voltage pulse generator currently used in clinical practice for electrochemotherapy that uses reversible electroporation. The voltage pulses were applied by means of a standard hexagonal electrode composed by seven, 20-mm-long equispaced needles. Irrespective of tumor size, the electrode applies electric pulses to the same volume of tissue. The resistance value was computed from the voltage and current recorded by the pulse generator, and it was correlated with the histological characteristics of the tumor tissue which was assessed by a dedicated pathologist. Some differences in resistance values, which could be correlated to a difference in tissue resistivity, were noticed according to sarcoma histotype. Lipomatous tumors (i.e., those rich in adipose tissue) displayed the highest resistance values (up to 1700 Ω), whereas in the other soft tissue sarcomas, such as those originating from muscle, nerve sheath, or fibrous tissue, the electrical resistance measured was between 40 and 110 Ω. A variability in resistance was found also within the same histotype. Among lipomatous tumors, the presence of myxoid tissue between adipocytes reduced the electrical resistance (e.g., 50–100 Ω). This work represents the first step in order to explore the difference in tissue electrical properties of STS. These results may be used to verify whether tuning electric field intensity according to the specific STS histotype could improve tissue electroporation and ultimately treatment efficacy.

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Acknowledgments

Authors are grateful to Prof. D. Miklavicic of University of Ljubljana for the helpful discussion with him. The research was partially made possible thanks to the networking COST TD1104 action (www.electroporation.net).

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Authors and Affiliations

  1. Sarcoma and Melanoma Unit, Veneto Institute of Oncology IOV IRCCS, Via Gattamelata, 64, 35128, Padua, Italy

    L. G. Campana, M. Rastrelli & C. R. Rossi

  2. Department of Industrial Engineering, University of Padova, Via Gradenigo, 6/a, 35131, Padua, Italy

    M. Cesari, F. Dughiero, M. Forzan & E. Sieni

  3. Melanoma and Sarcoma Pathology Unit, Veneto Institute of Oncology IOV IRCCS, Via Gattamelata, 64, 35128, Padua, Italy

    A. L. Tosi

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  1. L. G. Campana
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Correspondence to E. Sieni.

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Campana, L.G., Cesari, M., Dughiero, F. et al. Electrical resistance of human soft tissue sarcomas: an ex vivo study on surgical specimens. Med Biol Eng Comput 54, 773–787 (2016). https://doi.org/10.1007/s11517-015-1368-6

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