Impact of body mass index on overall survival in patients with metastatic breast cancer

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Saleh, Khalil | Carton, Matthieu | Dieras, Véronique | Heudel, Pierre-Etienne | Brain, Etienne | D’hondt, Véronique | Mailliez, Audrey | Patsouris, Anne | Mouret-Reynier, Marie-Ange | Goncalves, Anthony | Ferrero, Jean Marc | Petit, Thierry | Emile, George | Uwer, Lionel | Debled, Marc | Dalenc, Florence | Jouannaud, Christelle | Ladoire, Sylvain | Leheurteur, Marianne | Cottu, Paul | Veron, Lucie | Savignoni, Alexia | Courtinard, Coralie | Robain, Mathieu | Delaloge, Suzette | Deluche, Elise

Edité par CCSD ; Elsevier -

International audience. Background: High Body mass index (BMI) is a risk factor for breast cancer among postmenopausal women and an adverse prognostic factor in early-stage. Little is known about its impact on clinical outcomes in patients with metastatic breast cancer (MBC).Methods: The National ESME-MBC observational cohort includes all consecutive patients newly diagnosed with MBC between Jan 2008 and Dec 2016 in the 18 French comprehensive cancer centers.Results: Of 22 463 patients in ESME-MBC, 12 999 women had BMI data available at MBC diagnosis. Median BMI was 24.9 kg/m2 (range 12.1-66.5); 20% of women were obese and 5% underweight. Obesity was associated with more de novo MBC, while underweight patients had more aggressive cancer features. Median overall survival (OS) of the BMI cohort was 47.4 months (95% CI [46.2-48.5]) (median follow-up: 48.6 months). Underweight was independently associated with a worse OS (median OS 33 months; HR 1.14, 95%CI, 1.02-1.27) and first line progression-free survival (HR, 1.11; 95%CI, 1.01; 1.22), while overweight or obesity had no effect.Conclusion: Overweight and obesity are not associated with poorer outcomes in women with metastatic disease, while underweight appears as an independent adverse prognostic factor.

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