Research Papers:

Effects of alcohol consumption, ALDH2 rs671 polymorphism, and Helicobacter pylori infection on the gastric cancer risk in a Korean population

Sarah Yang _, Jeonghee Lee, Il Ju Choi, Young Woo Kim, Keun Won Ryu, Joohon Sung and Jeongseon Kim

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Oncotarget. 2017; 8:6630-6641. https://doi.org/10.18632/oncotarget.14250

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Sarah Yang1,2, Jeonghee Lee1, Il Ju Choi3, Young Woo Kim3,4, Keun Won Ryu3, Joohon Sung2, Jeongseon Kim1,4

1Molecular Epidemiology Branch, Division of Cancer Epidemiology and Prevention, National Cancer Center, Goyang, Korea

2Complex Disease & Genome Epidemiology Branch, Department of Public Health, Graduate School of Public Health, Seoul National University, Seoul, Korea

3Center for Gastric Cancer, National Cancer Center Hospital, National Cancer Center, Goyang, Korea

4Department of Cancer Control and Policy, Graduate School of Cancer Science and Policy, National Cancer Center, Goyang, Korea

Correspondence to:

Jeongseon Kim, email: [email protected]

Keywords: gastric cancer, alcohol, ALDH2 rs671 polymorphism, helicobacter pylori infection, interaction

Received: April 25, 2016     Accepted: December 05, 2016     Published: December 27, 2016


The effect of alcohol consumption on the risk of gastric cancer (GC) has not yet been fully elucidated, and an aldehyde dehydrogenase 2 (ALDH2) polymorphism, rs671, is a genetic variant that influences alcohol consumption in East Asians. Additionally, the discrepancy between the Helicobacter pylori (H. pylori) infection prevalence and GC incidence across Asian countries has not been explained. This study evaluated the effects of alcohol consumption and genetic susceptibility to defective acetaldehyde metabolism on the GC risk and their interactions with H. pylori infection. This study included 450 Korean GC cases and 1,050 controls recruited at the National Cancer Center. Data for 795 patients and 4,893 controls were used for further confirmation of the effect of rs671. Increased GC risks were evident for rs671 A allele carriers (odds ratio (OR), 1.23; 95% confidence interval (CI), 1.08-1.41) and H. pylori-infected individuals (OR, 7.07; 95% CI, 4.60-10.86), but no dose-response association with alcohol consumption was observed. Furthermore, the interactions between these factors were not significant. This study has demonstrated that alcohol consumption and rs671 should be considered simultaneously when assessing the GC risk. Additionally, alcohol-related factors were not found to interact with H. pylori infection, and further studies evaluating other environmental factors are required to explain the Asian enigma.

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