{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,2]],"date-time":"2026-08-02T04:47:16Z","timestamp":1785646036464,"version":"3.56.0"},"reference-count":62,"publisher":"MDPI AG","issue":"15","license":[{"start":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T00:00:00Z","timestamp":1785456000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000969","name":"American Institute for Cancer Research","doi-asserted-by":"crossref","id":[{"id":"10.13039\/100000969","id-type":"DOI","asserted-by":"crossref"}]},{"id":[{"id":"https:\/\/ror.org\/03b3akj74","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Cancers"],"abstract":"<jats:p>Background\/Objectives: Mammary adipose tissue functions as an active endocrine organ, potentially influencing breast carcinogenesis through metabolic and inflammatory mechanisms. This systematic review synthesized evidence on associations between mammary adipocyte size, obesity-related adipose tissue dysfunction, and breast cancer. Methods: A comprehensive literature search was conducted across MEDLINE, EMBASE, CENTRAL, CINAHL and Web of Science (January 2010\u2013September 2025) for observational studies measuring mammary adipocyte size in human breast tissue. Two reviewers independently conducted screening following the Cochrane Review\u2019s rigorous methodology, and bias assessment using the ROBINS-E (Risk Of Bias In Non-randomized Studies of Exposure) tool. Random-effects meta-analyses were performed for quantifiable outcomes, with heterogeneity assessed using the I2 statistic. Results: Twenty-one studies were included in the systematic review. Meta-analyses indicated that mammary adipocyte diameter was positively correlated with body mass index (8 studies; n = 720; correlation coefficient (r) = 0.44, 95% CI: 0.29\u20130.56), crown-like structure (CLS) density (5 studies; n = 383; r = 0.45, 95% confidence interval (CI): 0.36\u20130.54), aromatase expression (3 studies; n = 333; r = 0.36, 95% CI: 0.05\u20130.61), and three studies compared adipocyte diameter between CLS-positive and CLS-negative tissue (n = 297; mean difference = 9.69 \u03bcm, 95% CI: 4.94\u201314.44). Conclusions: This review summarizes moderate positive correlations of mammary adipocyte size with systemic adiposity, local breast inflammation, and aromatase expression, supporting a potential role for mammary adipose tissue in obesity-related metabolic dysfunction. Future prospective studies with standardized measurement protocols and improved control for confounding variables are needed to strengthen causal inference and clinical applications.<\/jats:p>","DOI":"10.3390\/cancers18152464","type":"journal-article","created":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T08:46:41Z","timestamp":1785487601000},"page":"2464","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Mammary Adipocyte Size, Obesity-Related Breast Adipose Tissue Dysfunction, and Breast Cancer: A Systematic Review and Meta-Analysis"],"prefix":"10.3390","volume":"18","author":[{"given":"Ouafa","family":"Badre","sequence":"first","affiliation":[{"name":"Department of Social and Preventive Medicine, Faculty of Medicine, Universit\u00e9 Laval, Quebec City, QC G1V 0A6, Canada"},{"name":"Cancer Research Centre, Universit\u00e9 Laval, Quebec City, QC G1J 0J9, Canada"},{"name":"Oncology Research Program, CHU de Qu\u00e9bec\u2013Universit\u00e9 Laval Research Center, Quebec City, QC G1J 0J9, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3440-4102","authenticated-orcid":false,"given":"Sue-Ling","family":"Chang","sequence":"additional","affiliation":[{"name":"Cancer Research Centre, Universit\u00e9 Laval, Quebec City, QC G1J 0J9, Canada"},{"name":"Oncology Research Program, CHU de Qu\u00e9bec\u2013Universit\u00e9 Laval Research Center, Quebec City, QC G1J 0J9, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3904-2390","authenticated-orcid":false,"given":"Belkacem","family":"Abdous","sequence":"additional","affiliation":[{"name":"Department of Social and Preventive Medicine, Faculty of Medicine, Universit\u00e9 Laval, Quebec City, QC G1V 0A6, Canada"},{"name":"Cancer Research Centre, Universit\u00e9 Laval, Quebec City, QC G1J 0J9, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julie","family":"Lemieux","sequence":"additional","affiliation":[{"name":"Cancer Research Centre, Universit\u00e9 Laval, Quebec City, QC G1J 0J9, Canada"},{"name":"Oncology Research Program, CHU de Qu\u00e9bec\u2013Universit\u00e9 Laval Research Center, Quebec City, QC G1J 0J9, Canada"},{"name":"Department of Medicine, Faculty of Medicine, Universit\u00e9 Laval, Quebec City, QC G1V 0A6, Canada"},{"name":"Center for Breast Diseases, Saint-Sacrement Hospital, CHU de Qu\u00e9bec\u2013Universit\u00e9 Laval, Quebec City, QC G1S 4L8, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8012-4641","authenticated-orcid":false,"given":"Francine","family":"Durocher","sequence":"additional","affiliation":[{"name":"Cancer Research Centre, Universit\u00e9 Laval, Quebec City, QC G1J 0J9, Canada"},{"name":"Endocrinology and Nephrology Research Program, CHU de Qu\u00e9bec\u2013Universit\u00e9 Laval Research Center, Quebec City, QC G1V 4G2, Canada"},{"name":"Department of Molecular Medicine, Faculty of Medicine, Universit\u00e9 Laval, Quebec City, QC G1V 0A6, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2587-1000","authenticated-orcid":false,"given":"Andr\u00e9","family":"Tchernof","sequence":"additional","affiliation":[{"name":"School of Nutrition, Faculty of Agriculture and Food Sciences, Universit\u00e9 Laval, Quebec City, QC G1V 0A6, Canada"},{"name":"Research Center, Quebec Heart and Lung Institute\u2013Universit\u00e9 Laval, Quebec City, QC G1V 4G5, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5355-7345","authenticated-orcid":false,"given":"Caroline","family":"Diorio","sequence":"additional","affiliation":[{"name":"Department of Social and Preventive Medicine, Faculty of Medicine, Universit\u00e9 Laval, Quebec City, QC G1V 0A6, Canada"},{"name":"Cancer Research Centre, Universit\u00e9 Laval, Quebec City, QC G1J 0J9, Canada"},{"name":"Oncology Research Program, CHU de Qu\u00e9bec\u2013Universit\u00e9 Laval Research Center, Quebec City, QC G1J 0J9, Canada"},{"name":"Center for Breast Diseases, Saint-Sacrement Hospital, CHU de Qu\u00e9bec\u2013Universit\u00e9 Laval, Quebec City, QC G1S 4L8, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,7,31]]},"reference":[{"key":"ref_1","first-page":"209","article-title":"Global Cancer Statistics 2020: GLOBOCAN Estimates of Incidence and Mortality Worldwide for 36 Cancers in 185 Countries","volume":"71","author":"Sung","year":"2021","journal-title":"CA Cancer J. 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