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Published in: BMC Cancer 1/2021

Open Access 01-12-2021 | Breast Cancer | Research

The relationship between dairy products intake and breast cancer incidence: a meta-analysis of observational studies

Authors: Yujing He, Qinghua Tao, Feifei Zhou, Yuexiu Si, Rongrong Fu, Binbin Xu, Jiaxuan Xu, Xiangyuan Li, Bangsheng Chen

Published in: BMC Cancer | Issue 1/2021

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Abstract

Background

The effect of dairy products intake on breast cancer (BC) is highly controversial. This study aims to investigate the relationship between dairy intake and BC incidence.

Methods

A search was carried out in PubMed, EBSCO, Web of Science, and Cochrane Library databases before January 2021. The primary objective was the risk of BC and intake of dairy products were exposure variables.

Results

The meta-analysis comprised 36 articles with 1,019,232 participants. Total dairy products have a protective effect on female population (hazard ratio (HR) =0.95, 95% confidence interval (CI) =0.91–0.99, p = 0.019), especially for estrogen receptor-positive (ER+) (HR = 0.79, p = 0.002) and progesterone receptor-positive (PR+) BC (HR = 0.75, p = 0.027). For ER+/PR+ BC, there is a trend of protection, but it has not reached statistical significance (HR = 0.92, p = 0.075). Fermented dairy products can reduce BC risk in postmenopausal population (HR = 0.96, 95%CI = 0.93–0.99, p = 0.021), but have no protective effect on premenopausal population (HR = 0.98, 95%CI = 0.94–1.03, p = 0.52). Non-fermented dairy products have no significant effect on BC occurrence (p > 0.05). High-fat dairy products are harmful to women, without statistical difference (HR = 1.06, 95%CI = 1.00–1.13, p = 0.066). On the contrary, low-fat dairy products can protect the premenopausal population (HR = 0.94, 95%CI = 0.89–1.00, p = 0.048).

Conclusion

The intake of dairy products can overall reduce BC risk in the female population, but different dairy products have varying effects on different BC subtypes and menopausal status.
Appendix
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Metadata
Title
The relationship between dairy products intake and breast cancer incidence: a meta-analysis of observational studies
Authors
Yujing He
Qinghua Tao
Feifei Zhou
Yuexiu Si
Rongrong Fu
Binbin Xu
Jiaxuan Xu
Xiangyuan Li
Bangsheng Chen
Publication date
01-12-2021
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2021
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/s12885-021-08854-w

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