Coffee, tea, caffeine, and risk of non-melanoma skin cancer in a Chinese population: The Singapore Chinese Health Study.
J Am Acad Dermatol. 2019 Feb 4. Epub 2019 Feb 4. PMID: 30731173
Choon Chiat Oh
BACKGROUND: While epidemiological studies in populations of European-descent suggest possible chemo-protective effect of caffeine against non-melanoma skin cancer (NMSC), data in Asian populations are lacking.
OBJECTIVES: We examined the relations between coffee, tea and caffeine consumption, and NMSC risk among Chinese in Singapore.
METHODS: We used data from the Singapore Chinese Health Study, a prospective cohort of 63,257 men and women aged 45-74 years at recruitment from 1993 to 1998. Hazard ratios (HRs) and 95% confidence intervals (CIs) were estimated using multivariable Cox proportional hazard models.
RESULTS: Coffee drinking was associated with reduced NMSC risk in a dose-dependent manner (P trend<0.0001); compared with those who drank coffee less than weekly, in those who drank≥3 cups/day, HRs (95% CIs) were 0.54 (0.31-0.93) for risk of basal cell carcinoma, and 0.33 (0.13-0.84) for risk of squamous cell carcinoma. Compared with non-drinkers, daily drinkers of black tea also had reduced NMSC risk (HR=0.70; 95% CI=0.52-0.94). Caffeine intake reduced NMSC risk in a stepwise manner (P trend=0.0025); subjects with caffeine intake ≥400 mg/day had the lowest risk (HR=0.59; 95% CI=0.34-1.04).
CONCLUSION: Consumption of caffeinated drinks such as coffee and black tea may reduce the risk of NMSC among Chinese.