title: Coffee and the Risk of Lymphoma: A Meta-analysis Article.
abstract: BACKGROUND
  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.
  
  
  METHODS
  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. AllPvalues are two tailed.
  
  
  RESULTS
  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.
  
  
  CONCLUSIONS
  There was no sufficient evidence to support coffee consumption association with the risk of lymphoma. Further well-designed large-scaled cohort studies are needed to provide conclusions that are more definitive.
authors.affiliation: Dept. of Hematology, Tai'an Central Hospital, Tai'an, Shandong, China.
authors.forename: Tianjie
authors.initials: T
authors.lastname: Han
authors.affiliation: Dept. of Gastroenterology, Tai'an Central Hospital, Tai'an, Shandong, China.
authors.forename: Junshan
authors.initials: J
authors.lastname: Li
authors.affiliation: Dept. of Hematology, Tai'an Central Hospital, Tai'an, Shandong, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Wang
authors.affiliation: Dept. of Hematology, Shandong Provincial Hospital, Shandong University, Jinan, Shandong, China.
authors.forename: Hongzhi
authors.initials: H
authors.lastname: Xu
keywords: Case-control study; Coffee; Cohort study; Lymphoma; Meta-analysis