Аннотация:The practice of thoracic oncology demonstrates that the lungs often become affected by cancer. The antitumor effect of chemoradiation therapy can be poor, and surgical treatment is associated with reduced functionality of the organ and therefore reduced quality of life of patients. Therefore, nonspecific agents are required that combine a pronounced antitumor effect and, at the same time, restore pulmonary tissue. Our purpose was to study the effects of 1,3-diethylbenzimidazolium triiodide in a rat model of lung cancer by morphological analysis of pulmonary tissues.