Green tea consumption and risk of breast cancer and recurrence—A systematic review and meta-analysis of observational studies

Vincenza Gianfredi, Daniele Nucci, Angela Abalsamo, Mattia Acito, Milena Villarini, Massimo Moretti, Stefano Realdon

Research output: Contribution to journalReview article

Abstract

Breast cancer (BC) is the most common cancer in women and several factors are involved in its onset. Green tea (GT) has been shown to have potential beneficial effects on different types of cancer. The aim of this review was to evaluate the association between GT regular consumption and risk of BC in women. The risk of BC recurrence and risk of BC in relation to menopausal status were also evaluated. A literature search of PubMed, Scopus, and Web of Science was conducted. Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were followed to perform the systematic review and meta-analysis. Full texts were downloaded for 40 studies; however, only 13 records were included in the meta-analysis. Eight were cohort studies and five were case-control studies. The pooled sample consisted of 163,810 people. An inverse statistically significant relationship between GT and BC risk, with an Odds Ratio (OR) = 0.85 ((95% CI = 0.80–0.92), p = 0.000)), was found. Egger’s linear regression test did not show a potential publication bias (intercept 0.33, t = 0.40, p = 0.695), which was also confirmed by the symmetry of the funnel plot. Moreover, no high statistical heterogeneity (Chi2 = 31.55, df = 13, I2 = 58.79%, p = 0.003) was found. The results of this meta-analysis showed a potential protective effect of GT consumption on BC, especially for BC recurrence.

Original languageEnglish
Article number1886
JournalNutrients
Volume10
Issue number12
DOIs
Publication statusPublished - Dec 1 2018

Keywords

  • Breast cancer risk
  • Camellia sinensis
  • Cancer recurrence
  • Epigallocatechin
  • Green tea
  • Meta-analysis
  • Women

ASJC Scopus subject areas

  • Food Science
  • Nutrition and Dietetics

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