Green tea, black tea and breast cancer risk: a meta-analysis of epidemiological studies (2024)

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Volume 27 Issue 7 July 2006
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Can-Lan Sun

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Jian-Min Yuan

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Woon-Puay Koh

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Mimi C. Yu

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Carcinogenesis, Volume 27, Issue 7, July 2006, Pages 1310–1315, https://doi.org/10.1093/carcin/bgi276

Received:

06 July 2005

Revision received:

27 October 2005

Accepted:

12 November 2005

Published:

25 November 2005

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    Can-Lan Sun, Jian-Min Yuan, Woon-Puay Koh, Mimi C. Yu, Green tea, black tea and breast cancer risk: a meta-analysis of epidemiological studies, Carcinogenesis, Volume 27, Issue 7, July 2006, Pages 1310–1315, https://doi.org/10.1093/carcin/bgi276

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Abstract

Experimental studies have shown that tea and tea polyphenols have anti-carcinogenic properties against breast cancer. A number of epidemiologic studies, both case–control and cohort in design, have examined the possible association between tea intake and breast cancer development in humans. This meta-analysis included 13 papers which examined populations in eight countries and provided data on consumption of either green tea or black tea, or both in relation to breast cancer risk. Summary odds ratios (ORs) for highest versus non/lowest tea consumption level were calculated based on fixed and random effects models. Heterogeneity between studies was examined via the Q statistics. For green tea, the combined results from the four studies indicated a reduced risk of breast cancer for highest versus non/lowest intake (OR = 0.78, 95% CI = 0.61–0.98). For black tea, conflicting results were observed in case–control versus cohort studies. The combined results from the eight case–control studies showed a minor inverse association between black tea consumption and risk of breast cancer (OR = 0.91, 95% CI = 0.84–0.98). This inverse association was stronger in hospital-based (OR = 0.77, 95% CI = 0.50–1.19) than population-based case–control studies (OR = 0.94, 95% CI = 0.81–1.09). Five cohort studies demonstrated a modest increase in risk associated with black tea intake (OR = 1.15, 95% CI = 1.02–1.31). The results of this meta-analysis indicate a lower risk for breast cancer with green tea consumption. Available data suggest a possible late-stage, promotional effect of black tea on breast carcinogenesis.

CI, confidence interval, EGCG, epigallocatechin gallate, HCC, hospital-based case–control study, OR, odds ratio, PCC, population-based case–control study, RR, relative risk

© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Topic:

  • heterogeneity
  • epidemiologic studies
  • tea
  • breast cancer
  • green tea
  • breast cancer risk

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