Abstract
IntroductionHeated debates have been on-going about tea consumption and the incidence of cancer, especially in head and neck cancer types. This study aimed to review the association between tea consumption habits and nasopharyngeal cancer (NPC). Methods:This review was carried out in accordance with the PRISMA-P protocol. Literature search for journal articles that published studies on the relationship between tea consumption and NPC was performed via databases, such as Elsevier, PubMed, Science Direct, Springer Link, Google, and Google Scholar, for 10 years from 2008 to 2018. Relevant studies were obtained by applying the pre-determined keywords, such as nasopharyngeal cancer, tea consumption and NPC, risk factors of NPC and benefits of tea consumption. Results:A total of 126 articles was retrieved. These articles were subjected to eligibility assessment. Six articles remained after applying the inclusion criteria. Results suggest that habitual tea consumption reduces NPC. Tea consumption significantly reduces NPC with all the studies having a p-value ≤0.05. Meta-analysis showed statistical association between tea consumption and NPC risk with OR=0.865 at 95% CI (0.806-0.929). Conclusion:This study suggests that habitual tea consumption could be associated with prevention of NPC development. Additional studies are needed to further understand the molecular role of bioactive compound and potential health benefit of tea consumption in NPC prevention.
Highlights
Tea is obtained from the leaves of Camellia sinensis plant and frequently consumed due to its flavour and potential health benefits (Goldbohm et al, 1996)
This review revealed inverse correlations between consumption frequencies of tea and nasopharyngeal cancer (NPC) risk (Table I), with each study having an odds ratio of less than 1 (1 is the reference value)
The frequency of tea consumption could possibly associated with reduction in NPC risk
Summary
Tea is obtained from the leaves of Camellia sinensis plant and frequently consumed due to its flavour and potential health benefits (Goldbohm et al, 1996). Tea has seven classifications based on brewing method. The global consumption rate of different tea types varied. The pu-erh and oolong tea types were most commonly consumed tea in China, black tea in Europe and America and green tea in East and Southeast Asia (Lin et al, 2003; Crespy and Williamson, 2004; Ng et al .,2014). Habitual tea consumption has been associated with prevention of various cancers (Lambert and Yang, 2003). The potential health benefit of tea consumption in NPC prevention in the context of habitual patterns is not clear. This study determined the association between tea consumption and NPC
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