H. pylori infection in gastrointestinal cancer: impact on the development, prognosis, and effectiveness of anticancer therapy. Literature review

Study Objective : to provide an overview of current scientific data on the impact of H. pylori infection and eradication therapy on the development, clinical course and treatment outcomes of gastrointestinal cancer. Material and Methods . A search of Russian and English-language literature sources published in various databases (MedLine, Pubmed, Scopus, The Cochrane Library, and Russian Science Citation Index) between 2004 and 2025 was conducted. Fifty-three available scientific publications were analyzed, including 5 Russian and 48 foreign publications, including 41 articles, 10 meta-analyses, and 2 retrospective studies. Results . An analysis of scientific papers showed that H. pylori infection significantly worsened treatment outcomes and survival in patients with already diagnosed gastric cancer. Literature data demonstrate a positive impact of H. pylori eradication on survival in both early and advanced gastric cancer. In addition to being a major risk factor for stomach cancer, H. pylori infection is also associated with an increased risk of colorectal cancer, esophageal adenocarcinoma, pancreatic cancer, and biliary tract cancer. Furthermore, H. pylori infection impacts the effectiveness of immunotherapy in cancer treatment Conclusion . H. pylori infection and eradication therapy can influence the development and clinical course of gastrointestinal tumors. Despite the close attention of many scientists to this issue, key questions remain poorly understood.