Background
Breast cancer (BC) is the most commonly diagnosed cancer among women. Understanding long-term trends in modifiable risk factors at the time of diagnosis is essential to inform and evaluate the effectiveness of BC prevention strategies. This study assessed 35-year trends in the prevalence of two modifiable risk factors—obesity and smoking—among BC women.
Methods
We conducted a retrospective cohort study including 14 595 women diagnosed with BC at the Centre des maladies du sein in Quebec City, Canada, between 1987 and 2021. Prevalence ratios (PRs) for obesity and smoking were estimated using multivariable log-binomial regression models adjusted for demographic and clinical characteristics.
Results
Over the 35-year period, obesity prevalence at diagnosis significantly increased [PR 1.19; 95% confidence interval (CI) 1.15-1.24; P < 0.0001], while smoking prevalence declined (PR 0.92; 95% CI 0.89-0.95; P < 0.0001). Stratified analyses showed more pronounced increase in obesity (PR 1.40; 95% CI 1.25-1.57; P < 0.0001) and decline in smoking (PR 0.82; 95% CI 0.78-0.86; P < 0.0001) among premenopausal women, compared with postmenopausal women (obesity: PR 1.16; 95% CI 1.11-1.21; P < 0.0001; smoking: PR 0.97; 95% CI 0.93-1.01; P = 0.1555).
Conclusions
The rising prevalence of obesity among BC patients at diagnosis underscores the need to strengthen public health efforts targeting obesity prevention. While anti-smoking measures appear to have been effective, additional strategies are warranted to address the growing burden of obesity and its potential impact on BC incidence in Canada and elsewhere.
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