Abstract
Purpose
This study aimed to determine whether the prognosis of breast cancer is affected by muscle or fat volume as measured from computed tomography (CT) images.
Methods
We identified 1460 patients with chest CT who were diagnosed as having breast cancer at the National Cancer Center, Korea, between January 2001 and December 2009. Using CT images of 10-mm slices, we measured the cross-sectional areas of skeletal muscle and adipose tissue at the 3rd lumbar vertebrae, and derived their volumes. The skeletal muscle volume, fat volume, and muscle-to-fat ratio were evaluated for association with overall survival (OS) and recurrence-free survival (RFS).
Results
The median skeletal muscle and fat volumes among the patients were 93.3 cc (range 39.6–236.9) and 420.1 cc (range 19.5–1392.3), respectively. Patients with higher muscle volume had better prognosis than those with lower muscle volume [hazard ratio (HR) 0.56, 95% confidence interval (CI) 0.34–0.92, P = 0.022 for OS; HR 0.72, 95% CI 0.52–0.99, P = 0.046 for RFS]. However, body mass index (BMI) and fat volume were not associated with prognosis. In addition, muscle volume was a significant prognosticator for OS, regardless of BMI (HR 0.55, 95% CI 0.32–0.93, P = 0.034 in BMI < 25.0; HR 0.44, 95% CI 0.21–0.91, P = 0.026 in BMI ≥ 25.0). Among older patients (≥ 50), those with higher muscle volume showed better OS and RFS (HR 0.44, 95% CI 0.23–0.85, P = 0.015; HR 0.55, 95% CI 0.34–0.90, P = 0.017, respectively).
Conclusion
This study demonstrated that breast cancer patients with higher skeletal muscle volume showed more favorable prognosis.
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Funding
This work was funded by the National Cancer Center Grant Nos. 1532200.
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Eun Jin Song has received research grant from the National Cancer Center. All authors except Eun Jin Song declare that they no conflict of interest.
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This article does not contain any studies with human participants or animals. The study protocol was approved by the institutional review board of the National Cancer Center (IRB No.: NCC2015-0006).
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Supplement figure 1
. Distribution of muscle volume and fat volume (TIF 134 KB)
Supplement figure 2
. Biological subgroup analysis. A forest plot showing the hazard ratios and 95% confidence intervals associated with the variables considered in the subgroup analysis for overall survival (left) and for recurrence-free survival (right). With respect to muscle volume, the triple-negative subgroup (ER and PR and Her2 Negative) was especially associated with the statistically significant hazard ratio of overall survival and recurrence-free survival (TIF 173 KB)
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Song, E.J., Lee, C.W., Jung, SY. et al. Prognostic impact of skeletal muscle volume derived from cross-sectional computed tomography images in breast cancer. Breast Cancer Res Treat 172, 425–436 (2018). https://doi.org/10.1007/s10549-018-4915-7
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DOI: https://doi.org/10.1007/s10549-018-4915-7