Coffee and head and neck cancer: lower risk overall, higher at the larynx, as an association

Design

Dose-response systematic review and meta-analysis of observational studies

Population

30 studies of coffee consumption and head and neck cancer

Primary outcome

Adjusted odds of head and neck cancer by coffee intake and tumour site

Effect

Overall OR 0.78 (95% CI 0.72 to 0.86); larynx OR 1.13 (1.04 to 1.24)

A dose-response meta-analysis pooled 30 studies, mostly case-control by design in this field, examining coffee intake and head and neck cancer.

Higher intake was associated with lower overall risk (OR 0.78, 95% CI 0.72 to 0.86), with ORs of 0.63 (0.52 to 0.74) above 3 cups a day and 0.71 (0.55 to 0.92) above 4. By site, oral cancer showed OR 0.71 (0.63 to 0.80), pharyngeal 0.80 (0.73 to 0.87), and upper aerodigestive tract 0.78 (0.64 to 0.94). Laryngeal cancer went the other way, with OR 1.13 (1.04 to 1.24).

The evidence is observational and prone to recall bias, and smoking and alcohol, the major causes, can confound coffee use. The mixed site pattern also argues against a simple protective effect. It should not feed into advice to drink more coffee; tobacco and alcohol cessation remain the messages that matter.

• Treat this as an association; it does not support advising patients to drink coffee to prevent cancer.
• Site-specific results diverged: lower oral and pharyngeal risk, higher laryngeal risk.
• Tobacco, areca nut and alcohol remain the dominant modifiable risks, particularly in India.
• Do not use coffee habits to reassure a patient with symptoms.

Why it matters

It shows how an apparent protective food association can reverse by site, a warning against single-number headlines.

Don't overread it

Pooled observational data open to confounding by smoking and alcohol; no causal effect is shown.

The statistics, in plain English

An odds ratio of 0.78 means 22% lower odds in heavier coffee drinkers compared with others in these studies. If heavy coffee drinkers also smoke or drink less, a lower risk would appear even without any effect of coffee.

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