Table of Contents
Abstract
Irreversible electroporation, electrochemotherapy, and other electroporation-based therapies represent a treatment paradigm for difficult-to-treat solid tumors; the potent combination of high-voltage electrical pulses with immune cascade–enhancing drugs may offer a bridge between locoregional and systemic treatments in oncology.
This review summarizes the use of high-voltage electrical pulses (HVEPs) in clinical oncology to treat solid tumors with irreversible electroporation (IRE) and electrochemotherapy (ECT). HVEPs increase the membrane permeability of cells, a phenomenon known as electroporation. Unlike alternative ablative therapies, electroporation does not affect the structural integrity of surrounding tissue, thereby enabling tumors in the vicinity of vital structures to be treated. IRE uses HVEPs to cause cell death by inducing membrane disruption, and it is primarily used as a radical ablative therapy in the treatment of soft-tissue tumors in the liver, kidney, prostate, and pancreas. ECT uses HVEPs to transiently increase membrane permeability, enhancing cellular cytotoxic drug uptake in tumors. IRE and ECT show immunogenic effects that could be augmented when combined with immunomodulatory drugs, a combination therapy the authors term electroimmunotherapy. Additional electroporation-based technologies that may reach clinical importance, such as gene electrotransfer, electrofusion, and electroimmunotherapy, are concisely reviewed. HVEPs represent a substantial advancement in cancer research, and continued improvement and implementation of these presented technologies will require close collaboration between engineers, interventional radiologists, medical oncologists, and immuno-oncologists.
© RSNA, 2020

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Article History
Received: Sept 30 2019
Revision requested: Nov 18 2019
Revision received: Dec 18 2019
Accepted: Dec 23 2019
Published online: Mar 24 2020