H. pylori—What Makes It a Friend or Foe in Cancer Risk?

How does infection with Helicobacter pylori (H. pylori) increase risk for gastric cancer but reduce risk for esophageal cancers? One proposed mechanism is that H. pylori induces gastric atrophy and hypochlorhydria—these promote gastric cancer but reduce acid exposure to the lower esophagus, which protects against esophageal adenocarcinoma. However, many people

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