In 1994, the World Health Organzation categorized H. pylori as a Class-1 human carcinogen. Since by a cautious estimate more than half of world?s population is infected with this bacterium, it comes as a surprise that less than 1% of the infected individuals eventually develop gastric adenocarcinoma. Surely, the relationship between H. pylori and cancer is not straightforward; as always, when it is embarrassing to admit our ignorance, the official verdict is that ?environmental and genetic factors? must play a role.
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