Alcohol

This umbrella review synthesizes findings from multiple systematic reviews and meta-analyses published over the last decade, establishing that mouth cancer risk increases proportionally with greater alcohol intake. The combined effect of alcohol and tobacco use further elevates risk beyond either substance alone. No safe limit for alcohol consumption has been identified in relation to oral cancer. The review consolidates evidence on alcohol's role in carcinogenic change in oral tissues, drawing from pooled analyses across large population studies examining relative risk associated with varying levels of alcohol consumption.

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In this case-control study of 749 oral and pharyngeal cancer cases and 1,770 controls conducted in Italy and Switzerland (1992-1999), alcohol consumption was included as a covariate in multivariate logistic regression models alongside age, sex, study centre, education, and smoking variables. The study identifies alcohol as one of the main risk factors for oral, pharyngeal, and oesophageal cancers in developed countries, used in all adjusted analyses to isolate the independent effect of cigarette tar yield on cancer risk.

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In this case-control study of 107 oral cancer patients and 505 hospital controls from a region with particularly elevated alcohol use, the unfavorable effect of maize on oral cancer risk (OR = 3.3) was evident only among individuals consuming 42 or more alcoholic drinks per week. The study population in Pordenone Province showed high incidence of upper digestive tract neoplasms alongside elevated alcohol and tobacco use. Heavy alcohol consumption was the critical contextual factor that activated the cancer risk associated with maize-heavy diets and their resulting niacin and riboflavin deficiencies.

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In pooled data from 5,127 cases and 13,249 controls, heavy alcohol drinkers with low folate intake had an OR of 4.05 (95% CI: 3.43-4.79) for oral and pharyngeal cancer compared to never/light drinkers with high folate intake. The attributable proportion owing to the alcohol-folate interaction was 11.1% (95% CI: 1.4-20.8%), indicating a synergistic effect between heavy drinking and folate deficiency on cancer risk beyond their independent contributions.

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In the ambispective cohort study of 88 consecutive patients with pathologically confirmed oral squamous cell carcinoma (65.9% males, mean age 60±11.3), alcohol usage was assessed as a potential factor related to disease stage at diagnosis. The study included alcohol alongside smoking history, tumor site, macroscopic pattern, and degree of differentiation as variables under investigation. Of the 88 patients, 45.5% were diagnosed at early stages (I-II) and 54.5% at advanced stages (III-IV).

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Environmental risk factors were assessed in a cohort of 119 OSCC patients studied retrospectively and 496 OSCC patients studied prospectively in North-East Hungary. The region reports 100-150 new OSCC cases per year with a documented increase in advanced lesions. Environmental risk factor analysis across this combined cohort of over 600 patients identified alcohol as a significant modifiable contributor to oral cancer development in the studied population.

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In this case-control study involving 749 oral and pharyngeal cancer cases and 1770 controls across Italy and Switzerland, alcohol consumption was included as a covariate in the multivariate logistic regression models alongside age, sex, study centre, and education. The study explicitly identifies tobacco smoking and alcohol as main risk factors for oral, pharyngeal, and oesophageal cancers in developed countries. While the primary analysis focused on tar yield, the adjustment for alcohol confirms its independent contribution to upper digestive tract cancer risk in this population.

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The European Cancer Prevention Organization working group consensus endorsed IARC's classification of alcoholic beverages as carcinogenic to humans. Oral cancer is identified as 1 of 4 tumor types most strongly related to alcohol (alongside esophageal, laryngeal, and hepatic cancers). Danish adult per capita alcohol consumption increased from approximately 4 liters to 11-12 liters of pure ethanol per year between 1955 and 1990, corresponding to 2-3 drinks per adult per day, with a concomitant increase in acute alcohol-related diseases. A substantial proportion of alcohol-induced oral cancers results from heavy drinking, and reduction to moderate levels should considerably lower risk. The working group noted that daily alcohol consumption even at moderate levels increases cancer risks.

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