Associations of coffee and tea consumption with lung cancer risk
Menée auprès de plus d'1,1 million de personnes incluses dans des cohortes américaines et chinoises (durée médiane de suivi : 8,6 ans), cette étude analyse l'association entre la consommation de thé ou de café et le risque de cancer du poumon (20 280 cas), en fonction du sexe, de l'origine ethnique, du type de café et du statut tabagique
Associations of coffee and tea consumption with lung cancer risk have been inconsistent, and most lung cancer cases investigated were smokers. Included in this study were over 1.1 million participants from 17 prospective cohorts. Cox regression analyses were conducted to estimate hazard ratios (HRs) and 95% confidence intervals (CIs). Potential effect modifications by sex, smoking, race, cancer subtype and coffee type were assessed. After a median 8.6 years of follow-up, 20 280 incident lung cancer cases were identified. Compared with non-coffee and non-tea consumption, HRs (95% CIs) associated with exclusive coffee drinkers (≥2 cups/day) among current, former and never smokers were 1.30 (1.15-1.47), 1.49 (1.27-1.74) and 1.35 (1.15-1.58), respectively. Corresponding HRs for exclusive tea drinkers (>2 cups/day) were 1.16 (1.02-1.32), 1.10 (0.92-1.32) and 1.37 (1.17-1.61). In general, the coffee and tea associations did not differ significantly by sex, race or histologic subtype. Our findings suggest that higher consumption of coffee or tea is associated with increased lung cancer risk. However, these findings should not be assumed to be causal because of the likelihood of residual confounding by smoking, including passive smoking, and change of coffee and tea consumption after study enrolment.