Infection by Helicobacter pylori affects about 50% of the human population. Of those infected, 10% to 15% will develop peptic ulcer and up to 3% will present with gastric cancer. These estimates suggest that around 7% of the world's population will eventually develop H. pylori -associated gastroduodenal disease. In fact, gastric cancer remains the second cause of cancer mortality worldwide (1). Fortunately, evidence suggests that the prevalence of H. pylori infection is decreasing in developed countries; accordingly, a decrease in peptic ulcer and cancer is also being observed (2). It remains uncertain whether the infection is also decreasing in developing countries. The aim of this review is to present the trend of both H. pylori infection and gastric cancer in Mexico, a country where sanitary and public health conditions have been improving during the last decades.
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