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Published on: January 12, 2020
Alcohol consumption and digestive tract cancer
Stephan L Haas1, Weimin Ye, Johannes-Matthias Löhr
1Gastrocentrum, Karolinska Institutet and Karolinska University Hospital, Stockholm, Sweden.
Current Opinion in Clinical Nutrition and Metabolic Care
|July 17, 2012
Summary
Alcohol consumption is a significant, preventable risk factor for gastrointestinal cancers. This review summarizes evidence linking ethanol metabolism, acetaldehyde, and oxidative stress to increased cancer risk, particularly in the upper digestive tract.
Area of Science:
- Gastroenterology and Oncology
- Molecular Carcinogenesis
- Epidemiology of Cancer
Background:
- Emerging evidence highlights alcohol as a key risk factor for gastrointestinal (GI) cancers.
- Ethanol metabolism produces acetaldehyde, a known carcinogen that damages DNA.
Purpose of the Study:
- To review and synthesize current scientific evidence on the relationship between alcohol consumption and GI cancer risk.
- To consolidate data on the mechanisms and epidemiological associations of alcohol-induced carcinogenesis.
Main Methods:
- Systematic review of recent large prospective cohort studies and meta-analyses.
- Analysis of molecular mechanisms including DNA adduct formation and oxidative stress.
- Examination of genetic variations in alcohol-metabolizing enzymes.
Main Results:
- Acetaldehyde, a primary ethanol metabolite, exhibits direct carcinogenic and mutagenic effects.
- Oxidative stress contributes to chronic inflammation and carcinogenesis via reactive oxygen species.
- Genetic variants in alcohol-metabolizing enzymes are linked to increased esophageal and gastric cancer risk.
- Highest risk elevations observed for upper aerodigestive tract and esophageal cancers; weaker associations for gastric, pancreatic, and colorectal cancers.
Conclusions:
- Alcohol overconsumption is a major, modifiable risk factor for GI tract cancers.
- The risk is amplified when combined with other factors like tobacco use and obesity.
- Public health strategies should address alcohol consumption to mitigate cancer burden.
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