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Published in: Cancer Causes & Control 5/2020

Open Access 01-05-2020 | Breast Cancer | Review article

The impact of lifestyle and reproductive factors on the risk of a second new primary cancer in the contralateral breast: a systematic review and meta-analysis

Authors: Delal Akdeniz, M. Maria Klaver, Chloé Z. A. Smith, Linetta B. Koppert, Maartje J. Hooning

Published in: Cancer Causes & Control | Issue 5/2020

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Abstract

Purpose

The risk of being diagnosed with contralateral breast cancer (CBC) is an important health issue among breast cancer survivors. There is an increasing interest in the effect of lifestyle and reproductive factors on CBC risk, since these factors may partly be modifiable. We performed a systematic review and meta-analysis and aimed to evaluate the impact of lifestyle and reproductive factors on CBC risk in population-based breast cancer studies.

Methods

The PubMed electronic database was searched up to 2nd November 2019, for relevant publications. Of the included studies, a meta-analysis per lifestyle or reproductive factor was performed.

Results

Thirteen out of 784 publications were used for the meta-analysis. Body mass index (≥ 25 vs. < 25 kg/m2; RR = 1.22; 95% CI 1.01–1.47) was associated with increased CBC risk. The estimates for alcohol use (ever vs. never; RR = 1.15; 95% CI 1.02–1.31) and age at primiparity (≥ 25 vs. < 25 years; RR = 1.06; 95% CI 1.02–1.10) also showed an association with increased CBC risk. For parity (≥ 4 vs. nulliparous; RR = 0.56; 95% CI 0.42–0.76) and age at menopause (< 45 vs ≥ 45 years; RR = 0.79; 95% CI 0.67–0.93), results from two studies suggested a decreased CBC risk. We observed no association between CBC and smoking, age at menarche, oral contraceptive use, gravidity, breastfeeding, or menopausal status. Overall, the number of studies per risk factor was limited (n = 2–5).

Conclusions

BMI is a modifiable risk factor for CBC. Data on the effect of other modifiable lifestyle and reproductive factors are limited. For better counseling of patients on lifestyle effects, more studies are urgently needed.
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Metadata
Title
The impact of lifestyle and reproductive factors on the risk of a second new primary cancer in the contralateral breast: a systematic review and meta-analysis
Authors
Delal Akdeniz
M. Maria Klaver
Chloé Z. A. Smith
Linetta B. Koppert
Maartje J. Hooning
Publication date
01-05-2020
Publisher
Springer International Publishing
Published in
Cancer Causes & Control / Issue 5/2020
Print ISSN: 0957-5243
Electronic ISSN: 1573-7225
DOI
https://doi.org/10.1007/s10552-020-01284-2

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