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

Cancer Causes & Control : CCC
Delal AkdenizMaartje J Hooning

Abstract

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. 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. 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 sm...Continue Reading

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Citations

Sep 26, 2020·Cancer Causes & Control : CCC·Tiffany R SanchezAna Navas-Acien
Dec 29, 2020·Journal of Obstetric, Gynecologic, and Neonatal Nursing : JOGNN·Marit L BovbjergMelissa Cheyney
Feb 11, 2021·JAMA Surgery·David W LimSteven A Narod
May 28, 2021·British Journal of Cancer·Vasily GiannakeasSteven A Narod
Apr 7, 2021·Journal of the National Cancer Institute·Heather Spencer FeigelsonGretchen L Gierach

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