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Kaplan-Meier analysis of the proportion of gastric cancer development classified by pepsinogen status and Helicobacter pylori antibody (groups A–D, see text for details). During follow up, gastric cancer developed in seven of 3324 group A patients (0.2%), six of 2134 group B patients (0.3%), 18 of 1082 group C patients (1.7%), and 12 of 443 group D patients (2.7%) (p<0.0001 by log rank test).
