Generation and measurement of low-temperature plasma for cancer therapy: a historical review
Kenji Ishikawa, Keigo Takeda, S. Yoshimura, Takashi Kondo, Hiromasa Tanaka, Shinya Toyokuni, Kae Nakamura, Hiroaki Kajiyama, Masaaki Mizuno, Masaru Hori
Abstract
This review provides a description of the historical background of the development of biological applications of low-temperature plasmas. The generation of plasma, methods and devices, plasma sources, and measurements of plasma properties, such as electron dynamics and chemical species generation in both gaseous and aqueous phases, were assessed. Currently, direct irradiation methods for plasma discharges contacting biological surfaces, such as the skin and teeth, are related to plasma biological interactions. Indirect methods using plasma-treated liquids are based on plasma-liquid interactions. The use of these two methods is rapidly increasing in preclinical studies and cancer therapy. The authors address the prospects for further developments in cancer therapeutic applications by understanding the interactions between the plasma and living organisms.