Understanding stomach bacteria and precancerous changes in the stomach

This is a long-term research study for people who have been diagnosed with H. pylori infection (a common stomach bacteria) or precancerous changes in the stomach lining, such as atrophic gastritis or intestinal metaplasia. Researchers want to follow patients over time to understand which factors make these conditions more likely to progress to stomach cancer, and to figure out the best way to monitor people who are at risk.

H. pylori infection affects billions of people worldwide and can lead to stomach cancer if left untreated. While doctors know that early treatment can help prevent serious complications, much is still unknown about which patients are most at risk and how often they should be monitored. This study aims to fill those gaps and help doctors make better decisions about screening and follow-up care.