Domain-specific patterns of physical activity and risk of breast cancer sub-types in the MCC-Spain study

• Published in: Breast cancer research and treatment 2019-10, Vol.177 (3), p.749-760
• Main Authors: Huerta, José M., Molina, Antonio J., Chirlaque, María Dolores, Yepes, Pedro, Moratalla-Navarro, Ferrán, Moreno, Víctor, Amiano, Pilar, Guevara, Marcela, Moreno-Iribas, Conchi, Llorca, Javier, Fernández-Tardón, Guillermo, Molina-Barceló, Ana, Alguacil, Juan, Marcos-Gragera, Rafael, Castaño-Vinyals, Gemma, Pérez-Gómez, Beatriz, Kogevinas, Manolis, Pollán, Marina, Martín, Vicente
• Format: Article
• Language: English
• Subjects: Adult; Aged; Aged, 80 and over; Anthropometry; Biomarkers, Tumor; Body Weights and Measures; Breast cancer; Breast Neoplasms - epidemiology; Breast Neoplasms - etiology; Cancer; Cancer research; Case-Control Studies; Epidemiology; ErbB-2 protein; Estrogen; Estrogens; Exercise; Female; Health aspects; Health risk assessment; Humans; Invasiveness; Life Style; Medicine; Medicine & Public Health; Menopause; Middle Aged; Odds Ratio; Oncology; Oncology, Experimental; Physical activity; Postmenopausal women; Progesterone; Public Health Surveillance; Regression analysis; Risk Assessment; Risk Factors; Spain - epidemiology; Tumors; Young Adult
• ISSN: 0167-6806; 1573-7217
• DOI: 10.1007/s10549-019-05358-x

Purpose Literature on the separate effects of physical activities (PA) on risk of breast cancer (BC) sub-types is heterogeneous. We investigated domain-specific associations between PA and BC risk by menopausal status and molecular subtype. Methods 1389 histologically confirmed invasive BC cases and 1712 controls from the MCC-Spain study were included (age: 20–85 years). Questionnaire information on PA at work, at home, and during leisure time, including recreational PA and sedentary time, and data on reproductive history, anthropometry, family history of BC, diet, and lifestyles were obtained through face-to-face interviews. Information on the expression of oestrogen (ER), progesterone (PR), and HER2 receptors was available for > 95% of the cases. Mixed-effects multivariable logistic regression models were used to estimate odds ratios (OR) of BC sub-types. Results Occupational PA (OPA) intensity was associated with higher BC risk. Associations were stronger for pre-menopausal (OR active/very active vs. sedentary job 1.89; 95% confidence interval (CI) 1.22, 2.91) and ER+/PR+, HER2− tumours (OR 1.80; 95% CI 1.28, 2.53). Sedentary time was associated with higher risk of post-menopausal BC (OR 6−9 vs.