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Postdiagnosis body fatness, weight change and breast cancer prognosis: Global Cancer Update Program (CUP global) systematic literature review and meta-analysis

Title: Postdiagnosis body fatness, weight change and breast cancer prognosis: Global Cancer Update Program (CUP global) systematic literature review and meta-analysis
Authors: Chan, DSM
Vieira, R
Abar, L
Aune, D
Balducci, K
Cariolou, M
Greenwood, DC
Markozannes, G
Nanu, N
Becerra-Tomas, N
Giovannucci, EL
Gunter, MJ
Jackson, AA
Kampman, E
Lund, V
Allen, K
Brockton, NT
Croker, H
Katsikioti, D
McGinley-Gieser, D
Mitrou, P
Wiseman, M
Cross, AJ
Riboli, E
Clinton, SK
McTiernan, A
Norat, T
Tsilidis, KK
Item Type: Journal Article
Abstract: Previous evidence on postdiagnosis body fatness and mortality after breast cancer was graded as limited-suggestive. To evaluate the evidence on body mass index (BMI), waist circumference, waist-hip-ratio and weight change in relation to breast cancer prognosis, an updated systematic review was conducted. PubMed and Embase were searched for relevant studies published up to 31 October, 2021. Random-effects meta-analyses were conducted to estimate summary relative risks (RRs). The evidence was judged by an independent Expert Panel using pre-defined grading criteria. One randomized controlled trial and 225 observational studies were reviewed (220 publications). There was strong evidence (likelihood of causality: probable) that higher postdiagnosis BMI was associated with increased all-cause mortality (64 studies, 32 507 deaths), breast cancer-specific mortality (39 studies, 14 106 deaths) and second primary breast cancer (11 studies, 5248 events). The respective summary RRs and 95% confidence intervals per 5 kg/m2 BMI were 1.07 (1.05-1.10), 1.10 (1.06-1.14) and 1.14 (1.04-1.26), with high between-study heterogeneity (I2 = 56%, 60%, 66%), but generally consistent positive associations. Positive associations were also observed for waist circumference, waist-hip-ratio and all-cause and breast cancer-specific mortality. There was limited-suggestive evidence that postdiagnosis BMI was associated with higher risk of recurrence, nonbreast cancer deaths and cardiovascular deaths. The evidence for postdiagnosis (unexplained) weight or BMI change and all outcomes was graded as limited-no conclusion. The RCT showed potential beneficial effect of intentional weight loss on disease-free-survival, but more intervention trials and well-designed observational studies in diverse populations are needed to elucidate the impact of body composition and their changes on breast cancer outcomes.
Issue Date: 15-Feb-2023
Date of Acceptance: 2-Sep-2022
URI: http://hdl.handle.net/10044/1/100517
DOI: 10.1002/ijc.34322
ISSN: 0020-7136
Publisher: Wiley
Start Page: 572
End Page: 599
Journal / Book Title: International Journal of Cancer
Volume: 152
Issue: 4
Copyright Statement: © 2022 The Authors. International Journal of Cancer published by John Wiley & Sons Ltd on behalf of UICC. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
Publication Status: Published
Online Publication Date: 2022-10-24
Appears in Collections:Faculty of Medicine
School of Public Health

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