Coffee is implicated in the susceptibility to several cancers. However, the association between coffee and lymphoma remains unclear. This meta-analysis aimed to assess quantitatively the association between coffee and the incidence of lymphoma.
A literature search was performed for cohort and case-control studies published using PubMed, Cochrane, and EMBASE databases. Studies were included if they reported relative ratios (RR) and corresponding 95% confidence intervals (CIs) of lymphoma with respect to coffee consumption. Pooled relative risk (RR) and its 95% confidence interval (CI) were calculated. All P values are two tailed
Seven studies met the inclusion criteria, which included three cohort and four case-control studies. Compared with did not or seldom drink coffee per day, being no significantly association between coffee and risk of lymphoma (pooled RR: 1.05, 95%CI: 0.89–1.23). In the subgroup analysis, no significant association between coffee and lymphoma risk was detected not only in different study types (cohort studies RR: 1.29; 95% CI, 0.92–1.80; case control studies RR: 0.99; 95% CI, 0.82–1.99) but also in different regions (Europe RR: 1.21; 95% CI: 0.99–1.47; USA RR: 0.85; 95% CI, 0.62–1.15; Asia RR: 1.08, 95% CI: 0.84–1.40) and coffee consumption status (≥4cups/d 1.03, 95% CI: 0.69–1.56; < 4cups/d RR: 1.06, 95% CI: 0.89–1.26). The funnel plot revealed no evidence for publication bias.