Efficacy of High Doses of Protons on the Induction of Solid Tumors in Mice by Ex vivo Irradiation of Ehrlich Ascitic Carcinoma Cells

We study the induction patterns of the solid form of Ehrlich ascitic carcinoma (EAC) in mice in the short(1 month) and long-term (18 months) periods after inoculation of ascitic cells irradiated ex vivo with a proton beam at doses of 30, 60, 90, 120, and 150 Gr. The growth rate of solid tumors after inoculation of irradiated cells ex vivo coincided with the growth of tumors in the control group. The frequency of tumor induction in mice transplanted with EAC cells was dose-dependent and decreased from 80% to 0% along with an increase in radiation dose. Thus, using the ex vivo model of tumor cell irradiation followed by in vivo grafting allowed us to determine the parameters of the antitumor effect of new proton therapy regimens.