Purpose of the study. An analysis of morphological features of the lung sarcoma 45 ectopic growth in rats of different sexes in course of experimental therapy with 1,3‑diethylbenzimidazolium triiodide.Materials and methods. Studies were carried out on 60 white nonlinear female and male rats weighing 180–220 g with transfusion of sarcoma cells 45 suspension from the subclavian vein into the lung, which resulted in subsequent ectopic tumor growth. At the same time, per os, 0.5 ml of an aqueous solution of 1,3‑diethylbenzimidazolium triiodide in a single dose of 0.4 mg/kg was administered. Morphological control of the lung tumor growth was carried out in stages, weeks 1 through 8, while assessing visual changes with Axiovert microscope (Carl 44 Zeiss, Germany) as well as with Axiovision 4 image visualization program (Carl Zeiss, Germany).Results. It was found out that, instead of the initial acute phase of blood flow reduction due to introduction of tumor cells resulting in neoplastic growth, activation of the immunity cellular link occurred under the influence of 1,3‑diethylbenzimidazolium triiodide along with a compensatory increase in bronchoalveolar structures, regression of tumor nodes and proliferation of connective tissue. At the same time, in females, a more rapid restructuring of the protective cellular systems of the lung occurs, and tumor regression is observed.Conclusion. The morphological manifestations of triiodide indicate the antitumor effect of 1,3‑diethylbenzimidazolium on the possibility of inhibiting lung sarcoma 45 ectopic growth and demonstrate a high reactivity of female rats to the damaging effect of the tumor and the rate of disturbed pulmonary structures compensation.
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