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The effect of body mass index on overall and disease-free survival in node-positive breast cancer patients treated with docetaxel and doxorubicin-containing adjuvant chemotherapy: the experience of the BIG 02-98 trial

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Abstract

Background: Obesity has been shown to be an indicator of poor prognosis for patients with primary breast cancer (BC) regardless of the use of adjuvant systemic therapy. Patients and methods: This is a retrospective analysis of 2,887 node-positive BC patients enrolled in the BIG 02-98 adjuvant study, a randomised phase III trial whose primary objective was to evaluate disease-free survival (DFS) by adding docetaxel to doxorubicin-based chemotherapy. In the current analysis, the effect of body mass index (BMI) on DFS and overall survival (OS) was assessed. BMI was obtained before the first cycle of chemotherapy. Obesity was defined as a BMI ≥ 30 kg/m². Results: In total, 547 (19%) patients were obese at baseline, while 2,340 (81%) patients were non-obese. Estimated 5-year OS was 87.5% for non-obese and 82.9% for obese patients (HR 1.34; P = 0.013). Estimated 5-years DFS was 75.9% for non-obese and 70.0% for obese patients (HR 1.20; P = 0.041). In a multivariate model, obesity remained an independent prognostic factor for OS and DFS. Conclusions: In this study, obesity was associated with poorer outcome in node-positive BC patients. Given the increasing prevalence of obesity worldwide, more research on improving the treatment of obese BC patients is needed.

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Acknowledgments

We thank the patients, physicians, nurses and data managers who participated in BIG 02-98 and the staff at the central offices of the cooperative groups. The following cooperative groups participated: Breast European Adjuvant Studies Team, International Breast Cancer Study Group (including Australian New Zealand Breast Cancer Trials Group), Irish Clinical Oncology Research Group, Grupo Español de Investigacion en Cancer de Mama, Danish Breast Cancer Cooperative Group, Swedish Breast Cancer Group, Austrian Breast and Colorectal Cancer Study Group and Grupo Oncologico Cooperative Chileno De Investigacion. The BIG 02-98 trial was supported by the National Health and Medical Research Council (project grants 100925 and 351164 to Australian New Zealand Breast Cancer Trials Group).

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Correspondence to Martine Piccart-Gebhart.

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On behalf of the BIG 02-98 Study Team.

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de Azambuja, E., McCaskill-Stevens, W., Francis, P. et al. The effect of body mass index on overall and disease-free survival in node-positive breast cancer patients treated with docetaxel and doxorubicin-containing adjuvant chemotherapy: the experience of the BIG 02-98 trial. Breast Cancer Res Treat 119, 145–153 (2010). https://doi.org/10.1007/s10549-009-0512-0

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  • DOI: https://doi.org/10.1007/s10549-009-0512-0

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