Abstract
Purpose. The aim of the review is to analyze the modern data on the molecular mechanisms of stomach and intestinal carcinogenesis, which can be the basis for managing of malignant stomach and intestine neoplasms mortality risks’ reduction.
 Materials and methods. The review includes data from foreign and domestic studies published in the electronic bibliographic databases PubMed, Cyberleninka, Elibrary over the past 10 years.
 Results. It is given the analysis of Wnt and β-catenin gene family role in the pathogenesis of stomach and colon malignant tumors and the carcinogenic potential of Helicobacter pylori in gastric cancer, as well as the driver bacteria contributing to the development of colon cancer.
 Conclusion. Stomach cancer and colon cancer are heterogeneous diseases with diverse molecular and histological subtypes, having both similarities and differences in the patterns of cancer promotion. Progress in transparency genesis of these diseases is associated with an understanding of cytotoxic and genotoxic effects, oxidative stress and chronic inflammation mechanisms.
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