Helicobacter pylori as an oncogenic pathogen, revisited

Area of Science:

• Gastroenterology
• Oncology
• Microbiology

Background:

• Gastric cancer is linked to Helicobacter pylori infection, which causes persistent gastric inflammation.
• H. pylori is a necessary but not sufficient cause of gastric cancer, with inflammation progression influenced by bacterial, host, and environmental factors.

Purpose of the Study:

• To explore the role of inflammation severity, extent, and duration in H. pylori-associated gastric cancer risk.
• To investigate how host, environmental, and bacterial factors that enhance inflammation contribute to gastric carcinogenesis.

Main Methods:

• Review of current evidence on H. pylori virulence, host susceptibility, and environmental influences on gastric inflammation.
• Analysis of mechanisms by which inflammation and H. pylori infection induce genomic instability, including DNA repair, methylation, and microRNA dysregulation.

Main Results:

• H. pylori virulence factors show limited impact on cancer risk, with a maximal 2-fold difference between strains.
• The degree and duration of gastric inflammation are critical determinants of gastric cancer progression.
• Factors amplifying the inflammatory response to H. pylori infection are strongly associated with increased gastric cancer risk.

Conclusions:

• Gastric inflammation, rather than specific H. pylori virulence factors, is the primary driver of gastric cancer.
• Understanding and mitigating inflammation is crucial for preventing H. pylori-induced gastric cancer.