Abstract
Purpose
We hypothesized that an increase in BMI category during neoadjuvant chemotherapy (NAC) would be associated with pathological complete response (pCR) rate and worse survival outcomes in primary breast cancer patients.
Methods
We reviewed the records of 4029 patients with stage I–III breast cancer who had undergone NAC and definitive surgery at our institution between May 1, 1990 and April 30, 2013. BMI values at baseline and after NAC were recorded, and the corresponding BMI category was assessed with the WHO classification. Overall survival (OS) and recurrence-free survival (RFS) were estimated using the Kaplan–Meier method, and multivariate Cox regression models were used to estimate the effect of covariates of interest on OS and RFS.
Results
The median follow-up period was 3.95 years. A change in BMI category from normal to obese during NAC was independently associated with shorter OS duration than was maintaining a normal weight [hazard ratio (HR) 1.637; 95%CI 1.066–2.514; p = 0.0242]. Kaplan–Meier curves among breast cancer subtypes showed differences, and a decrease in BMI led to better RFS and OS rates in obese patients with HR+/HER2− disease; those who maintained BMI also showed better prognosis for triple-negative breast cancer (TNBC). We saw no association between BMI change and pCR rate.
Conclusion
Our data suggest that inability to maintain normal weight during NAC is a predictive marker of poor survival but not pCR. It may be important for patients to maintain a normal weight during NAC.
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Acknowledgements
Tamara Locke in the Department of Scientific Publications at The University of Texas MD Anderson Cancer Center provided scientific editing services.
Funding
This study was funded by a My Oncology Dream award from the Japan Cancer Society, the Ichiro Kanehara Foundation for the Promotion of Medical Science and Medical Care, the National Institutes of Health through MD Anderson’s Cancer Center Support Grant P30CA016672, and a grant from the State of Texas Rare and Aggressive Breast Cancer Research Program.
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Debu Tripathy has received research grants from Novartis and consultant/advisory role from Novartis and Pfizer.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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A waiver of informed consent was authorized by institutional review board because the study was a retrospective chart review involving no diagnostic or therapeutic intervention.
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10549_2018_4853_MOESM1_ESM.pptx
Supplementary Figures: Supplemental Fig 1. Kaplan-Meier curves illustrating recurrence-free survival (A, B, and C) and overall survival (D, E, and F) according to BMI category change in HR+/HER2– patients. Supplemental Fig 2. Kaplan-Meier curves illustrating recurrence-free survival (A, B, and C) and overall survival (D, E, and F) according to BMI category change in TNBC patients. Supplemental Fig 3. Kaplan-Meier curves illustrating recurrence-free survival (A, B, and C) and overall survival (D, E, and F) according to BMI category change in HR+/HER2+ patients. Supplemental Fig 4. Kaplan-Meier curves illustrating recurrence-free survival (A, B, and C) and overall survival (D, E, and F) according to BMI category change in HR-/HER2+ patients (PPTX 5740 KB)
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Kogawa, T., Fujii, T., Fouad, T.M. et al. Impact of change in body mass index during neoadjuvant chemotherapy and survival among breast cancer subtypes. Breast Cancer Res Treat 171, 501–511 (2018). https://doi.org/10.1007/s10549-018-4853-4
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DOI: https://doi.org/10.1007/s10549-018-4853-4