Abstract
Purpose
Results of the associations between weight change after breast cancer diagnosis and prognosis were inconsistent. The modification effects of menopausal status and endocrine therapy on the associations remain poorly understood.
Methods
A total of 2016 breast cancer patients were recruited between October 2008 and January 2018 and followed up until December 31, 2019 in Guangzhou. Multivariate Cox models were used to estimate the hazard ratios (HRs) and 95% confidence intervals (95% CIs) for progression-free survival (PFS) in association with weight change after diagnosis.
Results
Weight loss at 2 years (HR = 1.34, 95% CI 0.87–2.06) or more than 2 years (HR = 1.95, 95% CI 1.22–3.10) after diagnosis increased risk of breast cancer progression. The adverse effect of weight loss was significantly more pronounced in post-menopausal than pre-menopausal women, particularly for weight loss at 2 years after diagnosis, with the HRs and 95% CIs of 2.41 (1.25–4.63) and 0.90 (0.49–1.64), respectively. Weight gain tended to reduce the risk of disease progression among patients with endocrine therapy but not for those with non-endocrine therapy; the significant interaction between weight gain at 2 years after diagnosis and endocrine therapy was observed (Pinteraction = 0.042).
Conclusion
Our finding suggested that weight loss was detrimental to breast cancer prognosis, particularly for post-menopausal women, while weight gain may be a potential beneficial indicator for the patients with endocrine therapy but not for those with non-endocrine therapy.
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Data availability
Enquiries about data availability should be directed to the authors.
Consent for publication
Not applicable.
Abbreviations
- BMI:
-
Body mass index
- CI:
-
Confidence interval
- ER:
-
Estrogen receptor
- HER2:
-
Human epidermal growth factor receptor 2
- HR:
-
Hazard ratio
- PFS:
-
Progression-free survival
- PR:
-
Progesterone receptor
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Acknowledgements
We sincerely thank the patients who participated in this study, the staff who conducted the baseline and the follow-up data collection, and the medical staff in the breast departments of the First Affiliated Hospital, the Second Affiliated Hospital, and the Cancer Center of Sun Yat-Sen University.
Funding
The results reported herein correspond to specific aims of Grants (or other source of support) 81773515 and 81973115 from the National Natural Science Foundation of China, and 2019B030316002 from the Science and Technology Planning Project of Guangdong Province, China.
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Zhang, YX., Liang, ZZ., Li, Yq. et al. Association between weight change and breast cancer prognosis. Breast Cancer Res Treat 193, 677–684 (2022). https://doi.org/10.1007/s10549-022-06592-6
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DOI: https://doi.org/10.1007/s10549-022-06592-6