Abstract
Objective
Body composition assessment derived from cross-sectional imaging has shown promising results as a prognostic biomarker in several tumor entities. Our aim was to analyze the role of low skeletal muscle mass (LSMM) and fat areas for prognosis of dose-limiting toxicity (DLT) and treatment response in patients with primary central nervous system lymphoma (PCNSL).
Methods
Overall, 61 patients (29 female patients, 47.5%) with a mean age of 63.8 ± 12.2 years, range 23–81 years, were identified in the data base between 2012 and 2020 with sufficient clinical and imaging data. Body composition assessment, comprising LSMM and visceral and subcutaneous fat areas, was performed on one axial slice on L3-height derived from staging computed tomography (CT) images. DLT was assessed during chemotherapy in clinical routine. Objective response rate (ORR) was measured on following magnetic resonance images of the head accordingly to the Cheson criteria.
Results
Twenty-eight patients had DLT (45.9%). Regression analysis revealed that LSMM was associated with objective response, OR = 5.19 (95% CI 1.35–19.94, p = 0.02) (univariable regression), and OR = 4.23 (95% CI 1.03- 17.38, p = 0.046) (multivariable regression). None of the body composition parameters could predict DLT. Patients with normal visceral to subcutaneous ratio (VSR) could be treated with more chemotherapy cycles compared to patients with high VSR (mean, 4.25 vs 2.94, p = 0.03). Patients with ORR had higher muscle density values compared to patients with stable and/or progressive disease (34.46 ± vs 28.18 ± HU, p = 0.02).
Conclusions
LSMM is strongly associated with objective response in patients with PCNSL. Body composition parameters cannot predict DLT.
Clinical relevance statement
Low skeletal muscle mass on computed tomography (CT) is an independent prognostic factor of poor treatment response in central nervous system lymphoma. Analysis of the skeletal musculature on staging CT should be implemented into the clinical routine in this tumor entity.
Key Points
• Low skeletal muscle mass is strongly associated with the objective response rate.
• No body composition parameters could predict dose-limiting toxicity.
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Abbreviations
- CI:
-
Confidence interval
- CR:
-
Complete response
- CT:
-
Computed tomography
- DLBCL:
-
Diffuse large B-cell lymphoma
- DLT:
-
Dose-limiting toxicity
- FFM:
-
Fat-free mass
- FM:
-
Fat mass
- HU:
-
Hounsfield unit
- IMAT:
-
Intramuscular adipose tissue
- L:
-
Lumbar
- LSMM:
-
Low skeletal muscle mass
- MRI:
-
Magnetic resonance imaging
- OR:
-
Odds ratio
- ORR:
-
Objective response rate
- PCNSL:
-
Primary central nervous system lymphoma
- PD:
-
Progressive disease
- SAT:
-
Subcutaneous adipose tissue
- SMA:
-
Skeletal muscle area
- SMI:
-
Skeletal muscle index
- TAT:
-
Total adipose tissue
- VAT:
-
Visceral adipose tissue
- VSR:
-
Visceral to subcutaneous ratio
- WBRT:
-
Whole-brain radiotherapy
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Surov, A., Meyer, H.J., Hinnerichs, M. et al. CT-defined sarcopenia predicts treatment response in primary central nervous system lymphomas. Eur Radiol 34, 790–796 (2024). https://doi.org/10.1007/s00330-023-09712-y
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DOI: https://doi.org/10.1007/s00330-023-09712-y