BIOLOGICAL MODEL OF LUNG CANCER COMBINATION AND TUBERCULOSIS: DEVELOPMENT FOR PRECLINICAL STUDY OF RATIONAL COMBINATIONS OF TARGETED ANTITUMOR AND ANTITUBERCULOSIS THERAPY

Abstract

Introduction. Lung cancer occupies a leading position in the structure of mortality from cancer. Chronic inflammation characteristic of tuberculosis increases the risk of lung cancer. Currently, more and more information is emerging confirming the cause-and-effect relationship between tuberculosis and cancer. The need to develop recommendations for public health regarding screening and treatment of tuberculosis in the tumor process determines the relevance of experimental studies on biological models of the combination of cancer and tuberculosis.. Aim. Creation а biological model of the combination of lung cancer and tuberculosis for preclinical study of rational combinations of antitumor and antituberculosis therapy. Material and methods: The biological model was implemented on C57BL/6 mice at the age of two months. Lewis epidermoid lung carcinoma was used to reproduce the tumor process. Modeling of tuberculosis was carried out using the reference strain Mycobacterium Tuberculosis H37RV. During the study, the following groups were formed: “intact mice” (healthy, uninfected with the Mycobacterium Tuberculosis (MBT) H37Rv strain without tumor cell transplantation); “control of MBT infection” (animals infected with Mycobacterium Tuberculosis strain H37Rv), “tumor control” (animals that were transplanted with epidermoid Lewis lung carcinoma) and “main group” (animals that were transplanted with epidermoid Lewis lung carcinoma simultaneously with MBT infection). Results. During the experiment, several models for creating the combined pathology of lung cancer and tuberculosis were identified. In the first (simultaneous infection and tumor inoculation), carcinoma developed more slowly in infected animals than in the tumor control group, and lung damage occurred with a predominance of the tuberculous process over the tumor process. The second (staged infection) also showed minimal metastatic manifestations with pronounced secondary changes in the primary tumor node. Analysis of the choice of model showed that the model with simultaneous infection and tumor inoculation most adequately ensures the development of the tumor process and tuberculosis infection, which allows maintaining the viability of the animal, fully developing the tumor process with metastasis to the lungs and obtaining the development of morphologically verified pulmonary tuberculosis.