Abstract
Background
Recently, numerous studies have reported an association between sarcopenia and poor outcomes in various kinds of malignancies. We investigated whether sarcopenia predicts the survival of patients with metastatic urothelial carcinoma who underwent systemic chemotherapy.
Methods
We reviewed 87 metastatic urothelial carcinoma patients who underwent chemotherapy (gemcitabine plus cisplatin or gemcitabine plus carboplatin for cisplatin-unfit patients) between 2007 and 2015. A computed tomography scan prior to chemotherapy was used for evaluating sarcopenia, and we measured three cross-sectional areas of skeletal muscle at the third lumbar vertebra and calculated the skeletal muscle index (SMI), the paraspinal muscle index (PSMI), and the total psoas area (TPA) of each patient. Predictive values of survival were assessed using Cox regression analysis.
Results
The median overall survival (OS) was 16 months (95% CI 13.5–18). Although SMI alone was not a significant predictor of shorter OS (P = 0.117) in univariate analysis, SMI stratified by the value of the body mass index (BMI) was a significant predictor of shorter OS in univariate analysis (P = 0.037) and was also an independent predictor of shorter OS in multivariate analysis (P = 0.026). PSMI and TPA were not significant prognostic factors even when stratified by BMI (P = 0.294 and 0.448), respectively.
Conclusion
Neither PSMI nor TPA could substitute SMI as a predictor for poor outcomes in metastatic urothelial carcinoma patients treated with systemic chemotherapy in our study. SMI stratified by BMI is a useful predictor of prognosis in these patients.
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Abbreviations
- GC:
-
Gemcitabine plus cisplatin
- GCb:
-
Gemcitabine plus carboplatin
- CT:
-
Computed tomography
- SMI:
-
Skeletal muscle index
- PSMI:
-
Paraspinal muscle index
- TPA:
-
Total psoas area
- OS:
-
Overall survival
- CI:
-
Confidence interval
- BMI:
-
Body mass index
- EWGSOP:
-
European Working Group on Sarcopenia in Older People
- UC:
-
Urothelial carcinoma
- MVAC:
-
Methotrexate, vinblastine, doxorubicin and cisplatin
- mUC:
-
Metastatic urothelial carcinoma
- ECOG PS:
-
Eastern Cooperative Oncology Group performance status
- LVI:
-
Lymphovascular invasion
- CRP:
-
C-reactive protein
- GPS:
-
Glasgow prognostic score
- L3:
-
Third lumber vertebra
- IQR:
-
Interquartile range
- DXA:
-
Dual-energy X-ray absorptiometry
- CT:
-
Computed tomography
- MRI:
-
Magnetic resonance imaging
- CVD:
-
Cardiovascular disease
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Acknowledgements
The authors are grateful to Dr. Ken-Ichiro Yoshida and Dr. Kyoko Arai for constructive suggestions, ServiceScape (https://www.servicescape.com) and Jessica McHale (http://oe-boston.com) for English language editing.
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Abe, H., Takei, K., Uematsu, T. et al. Significance of sarcopenia as a prognostic factor for metastatic urothelial carcinoma patients treated with systemic chemotherapy. Int J Clin Oncol 23, 338–346 (2018). https://doi.org/10.1007/s10147-017-1207-x
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DOI: https://doi.org/10.1007/s10147-017-1207-x