Green Tea Consumption and Risk of Breast Cancer and Recurrence-A Systematic Review and Meta-Analysis of Observational Studies

source extracted confidence: high 2026-04-09
#breast-neoplasms #female #humans #neoplasm-recurrence-local #risk-factors

Green Tea Consumption and Risk of Breast Cancer and Recurrence-A Systematic Review and Meta-Analysis of Observational Studies

Gianfredi et al., 2018 | Nutrients | Meta Analysis

Citation

Gianfredi Vincenza, Nucci Daniele, ... Realdon Stefano. Green Tea Consumption and Risk of Breast Cancer and Recurrence-A Systematic Review and Meta-Analysis of Observational Studies. Nutrients. 2018-Dec-03;10(12). doi:10.3390/nu10121886

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.

Key Findings

The results of this meta-analysis showed a potential protective effect of GT consumption on BC, especially for BC recurrence.

Outcomes Measured

  • Requires manual extraction

Population

Field Value
Population See abstract
Sample Size 163810
Age Range See abstract
Condition See abstract

MeSH Terms

  • Breast Neoplasms
  • Female
  • Humans
  • Neoplasm Recurrence, Local
  • Risk Factors
  • Tea

Evidence Classification

  • Level: Meta Analysis
  • Publication Types: Journal Article, Meta-Analysis, Systematic Review
  • Vertical: green-tea

Provenance

Source extracted via PubMed E-utilities API on 2026-04-09