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Preventable fractions of colon and breast cancers by increasing physical activity in Brazil: perspectives from plausible counterfactual scenarios

Published version
Peer-reviewed

Type

Article

Change log

Authors

Machado de Rezende, Leandro Fórnias 
Totaro Garcia, LM 
Mielke, Grégore Iven 
Hoon Lee, Dong 
Wu, Kana 

Abstract

Background: Physical activity is associated with lower risk of colon and breast cancers. Herein we estimated preventable fractions of colon and breast cancers in Brazil by increasing population-wide physical activity to different counterfactual scenarios. Methods: We used data from a representative national survey in Brazil and corresponding relative risks of colon and postmenopausal breast cancers from a meta-analysis. Estimated cancer incidence was retrieved from GLOBOCAN and Brazilian National Cancer Institute. Five counterfactual scenarios for physical activity were considered: (i) theoretical minimum risk exposure level (≥8,000 metabolic equivalent of tasks-minute/week – MET-min/week); (ii) physical activity recommendation (≥600 MET-min/week); (iii) a 10% reduction in prevalence of insufficient physical inactivity (<600 MET-min/week); (iv) physical activity level in each state equals the most active state in Brazil; (v) closing the gender differences in physical activity. Results: About 19% (3,630 cases) of colon cancers and 12% (6,712 cases) of postmenopausal breast cancers could be prevented by increasing physical activity to ≥8,000 MET-min/week. Plausible counterfactual scenarios suggested the following impact on cancer prevention: reaching physical activity recommendation: 1.3% (1,113 cases) of breast and 6% (1,137 cases) of colon; 10% reduction in physical inactivity prevalence: 0.2% (111 cases) of breast and 0.6% (114 cases) of colon; most active state scenario: 0.3% (168 cases) of breast and 1% (189 cases) of colon; reducing gender differences in physical activity: 1.1% (384 cases) of breast and 0.6% (122 cases) of colon. Conclusions: High levels of physical activity are required to achieve sizable impact on breast and colon cancer prevention in Brazil.

Description

Keywords

Cancer, Epidemiology, Physical activity, Population attributable fraction, Brazil, Breast Neoplasms, Colonic Neoplasms, Exercise, Female, Humans, Incidence, Male, Middle Aged, Prevalence, Risk Factors

Journal Title

Cancer Epidemiology

Conference Name

Journal ISSN

1877-7821
1877-783X

Volume Title

56

Publisher

Elsevier BV
Sponsorship
Medical Research Council (MR/K023187/1)
Economic and Social Research Council (ES/G007462/1)
Wellcome Trust (087636/Z/08/Z)
MRC (MR/L501438/1)