Abstract
Background
Obesity fosters worse clinical outcomes in both premenopausal and postmenopausal women with breast cancer. Emerging evidence suggests that an android body fat distribution in particular is deleterious for breast cancer prognosis. The extent of adipose tissue dysfunction, especially how it relates to breast cancer prognostic factors and anthropometric measurements, has not been fully investigated.
Objective
Our objective was to examine if markers of adipose tissue dysfunction, such as hypertrophy and macrophage accumulation, are relevant for the pathophysiology of breast cancer and its associated prognostic factors in a well-characterised cohort of women with breast cancer who did not receive treatment before surgery.
Methods
A consecutive series of 164 women with breast cancer provided breast adipose tissue sample. Multivariate generalised linear models were used to test associations of anthropometric indices and prognostic factors with markers of adipose tissue dysfunction.
Results
We found associations of breast adipocyte size and macrophage infiltration (number of CD68+ cells/100 adipocytes) with adiposity, particularly a strong association between breast adipocyte size and central obesity, independent of total adiposity, age and menopausal status (βadj = 0.87; p = 0.0001). We also identified relationships of adipocyte hypertrophy and macrophage infiltration with prognostic factors, such as cancer stage and tumour grade (p < 0.05). RNA expression of pro-inflammatory cytokines (IL6, TNF) and leptin was also increased as a function of adipocyte size and CD86+/CD11c+ macrophage number/100 adipocytes (p < 0.05).
Conclusions
Our findings support the model of dysfunctional adipose tissue in obesity-associated breast cancer.
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Acknowledgements
The authors thank all research team members who were involved in data acquisition and patient’s recruitment, including Lucie Tellier, Isabelle Dumas and Karine Plourde. We express gratitude to all the participants for allowing access to their biological samples and data, and for the time they devoted to answer questionnaires. This work was supported by an Intercenter Structuring Initiative of the Cardiometabolic health, Diabetes and Obesity (CMDO) Research Network to CD, AT and FD, and grants to CD from the Canadian Breast Cancer Research Alliance (#20462), the Fondation du cancer du sein du Québec and the Banque de tissus et données of the Réseau de recherche sur le cancer of the Fonds de recherche du Québec-santé (FRQS) associated with the Canadian Tumour Repository Network (CTRNet). SL is the recipient of Ph.D. scholarships from the FRQS and the Canadian Institutes of Health Research (CIHR) (GSD 154162). CD holds an Investigator Awards (Senior) from the FRQS.
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SL designed research study; conducted experiments; acquired, analysed and interpreted data; wrote the paper; critically revised the paper; and gave final approval. KEI provided pathologic examination of tissue specimens; contributed to acquire data and interpreted data; critically revised the paper; and gave final approval. GO conducted experiments; critically revised the paper; and gave final approval. MFG conducted experiments; contributed to acquire data; critically revised the paper; and gave final approval. AM provided biological specimens and experimental protocols; critically revised the paper; and gave final approval. FD funded the study and gave final approval. AT funded and designed the study; interpreted data; critically revised the paper; gave final approval; and supervised the study. CD funded and designed the study; acquired, analysed and interpreted data; critically revised the paper; gave final approval; and supervised the study.
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AT is the recipient of research grant support from Johnson & Johnson Medical Companies and Medtronic for studies unrelated to this publication. He has received consulting fees from Bausch Health. The remaining authors have no potential conflicts of interest to declare.
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Laforest, S., Ennour-Idrissi, K., Ouellette, G. et al. Associations between markers of mammary adipose tissue dysfunction and breast cancer prognostic factors. Int J Obes 45, 195–205 (2021). https://doi.org/10.1038/s41366-020-00676-3
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DOI: https://doi.org/10.1038/s41366-020-00676-3
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