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Although  Helicobacter pylori  ( H. pylori ) infection is associated with gastric cancer most patients infected with  H. pylori  do not develop gastric cancer. Gastric biopsy specimens were taken from 49 patients with early intestinal-type gastric cancer and from 49 age- and sex-matched control subjects. Histological features of gastritis were graded according to the updated Sydney System. Mononuclear cell infiltration of the corpus, and intestinal metaplasia of the angle increased the risk of developing gastric cancer. Probability of gastric cancer (P CA ) was calculated using these two parameters.    The specificities of 70 &lt;P CA  for gastric cancer patients, and P CA  &lt;30 for non-cancer subjects were 94 and 95%, respectively. P CA  &lt;20 was observed only in control subjects. Calculation of P CA , which requires only two biopsy specimens, may be useful to define the patients at high or low risk of intestinal-type gastric cancer among patients infected with  H. pylori .

Morphologic Criteria Using Biopsy Specimens to Define the Risk of Gastric Cancer in Patients with Helicobacter pylori Infection