Evidence map›Paper›PMID 28417981›Full record

ArticleProstate cancer and prostatic diseases2017

Reduced prostate cancer risk with green tea and epigallocatechin 3-gallate intake among Hong Kong Chinese men.

P M Y Lee, C F Ng, Z M Liu, W M Ho, M K Lee, F Wang, H D Kan, Y H He, S S M Ng, S Y S Wong and 1 more

Abstract read
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In one paragraph

Article in Prostate cancer and prostatic diseases, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
15citing papers in PubMed, 1 pooled it
4.1field-weighted citation impact, top 6% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

15 citing papers in PubMed, 1 synthesis or guideline pooled it, 34 citations in OpenAlex.

  1. Green tea (Camellia sinensis) for the prevention of cancer.The Cochrane database of systematic reviews · 2020
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

11 authors at 5 institutions in 1 country.

P M Y LeeJockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong SAR, China.
C F NgSH Ho Urology Centre, Department of Surgery, Prince of Wales Hospital, Hong Kong SAR, China.
Z M LiuDepartment of Nutrition, School of Public Health, Sun Yat-sen University, Guangzhou, China.
W M HoDepartment of Clinical Oncology, Prince of Wales Hospital, Hong Kong SAR, China.
M K LeeDepartment of Family Medicine, Prince of Wales Hospital, Hong Kong SAR, China.
F WangJockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong SAR, China.
H D KanSchool of Public Health, Key Lab of Public Health Safety of the Ministry of Education and Key Lab of Health Technology Assessment of the Ministry of Health, Fudan University, Shanghai, China.
Y H HeSchool of Public Health, Guilin Medical University, Guilin, China.
S S M NgSH Ho Urology Centre, Department of Surgery, Prince of Wales Hospital, Hong Kong SAR, China.
S Y S WongJockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong SAR, China.
L A TseJockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong SAR, China.
Hong Kong Jockey Club · CNPrince of Wales Hospital · CNFudan University · CNGuilin Medical University · CNSun Yat-sen University · CN

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundIn vitro and in vivo studies suggested that polyphenol epigallocatechin 3-gallate (EGCG) in tea may have anti-carcinogenic effect on prostate cells, but this protective effect has less been examined in epidemiology studies. We aimed to investigate the association between prostate cancer (PCA) risk and habitual green tea intake among Chinese men in Hong Kong; meanwhile, the relationship with EGCG was also explored.

methodsWe consecutively recruited 404 PCA cases and 395 controls from the same hospital who had complete data on habitual tea consumption, including green, oolong, black and pu'er tea. We reconstructed the level of EGCG intake according to a standard questionnaire and the analytic values for EGCG extracted from the literature published by Lin et al. in 2003. We calculated odds ratios (ORs) for tea consumption and EGCG intake using unconditional multiple logistic regression, and examined their exposure--response relationships with PCA risk.

resultsA total of 32 cases and 50 controls reported habitual green tea drinking, showing an adjusted OR of 0.60 (95% confidence interval (CI): 0.37, 0.98). A moderate excess risk was observed among the habitual pu'er tea drinkers (OR=1.44, 95% CI: 1.02, 1.91). A significantly lower intake of EGCG was observed among cases (54.4 mg) than the controls (72.5 mg), which resulted in an inverse gradient of PCA risk with the increasing intake of EGCG (test for trend, P=0.015).

conclusionPCA risk among Chinese men in Hong Kong was inversely associated with green tea consumption and EGCG intake, but these results need to be replicated in larger studies.

Indexed as

TeaAdministration, OralAgedAsian PeopleCase-Control StudiesCatechinHong KongHumansMaleMiddle AgedProstatic NeoplasmsRiskCatechinepigallocatechin gallateTea

Identifiers

PMID28417981
OpenAlexW2607412053

What OpenQuestion holds

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.