Association between Body Mass Index and Gastric Cancer Risk According to Effect Modification by Helicobacter pylori Infection.

Discussion About 1.3-fold increased GC risk in population with low BMI (< 23 kg/m 2 ) was found in both total cohort and case-cohort studies, but the association was marginally significant in the case-cohort study.

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Results Increased GC risk in lower BMI group (< 23 kg/m 2 ) with marginal significance, (HR, 1.32; 95% CI, 0.98 to 1.77) compared to the reference group (BMI of 23-24.9 kg/m 2 ) was observed.

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