From neck to abdomen: cervical (C3) muscle quantification as a surrogate to lumbar (L3) sarcopenia assessment in head and neck cancer: systematic review and meta-analysis.
Mehrad Zare, Alisa Mohebbi, Mohammad Hossein Eslami et al.
✦ AI-curated · Sources linked
In 30 seconds
This systematic review and meta-analysis assessed whether CT-derived skeletal muscle index at the third cervical vertebra (C3) can serve as a surrogate for the third lumbar vertebra (L3) in adults with head and neck cancer. Across 14 studies involving 2017 patients, the pooled correlation between C3 and L3 measurements was 0.79 (95% CI: 0.73 to 0.84; I 2 = 90.3%). Correlations were stronger in sex-specific analyses, and agreement increased with BMI. The authors conclude that routine cervical imaging may support sarcopenia assessment, while noting that prospective validation is needed.
Key findings
- Across 14 studies and 2017 patients, the pooled C3–L3 muscle-index correlation was 0.79 (95% CI: 0.73 to 0.84; I 2 = 90.3%).
- Sex-specific correlations were 0.92 in men and 0.94 in women.
- Correlation increased from 0.70 at BMI 23 to 0.90 at BMI 27.
Why it matters
L3-based sarcopenia assessment may be unavailable when abdominal CT is not routinely obtained in head and neck cancer. The observed correlation suggests that existing cervical imaging could offer a more accessible way to estimate muscle status, potentially avoiding additional imaging exposure. However, substantial heterogeneity and the need to validate thresholds mean that correlation alone does not establish equivalent clinical classification or outcome prediction.
What to keep in mind
The pooled correlation showed substantial heterogeneity (I 2 = 90.3%). The authors call for prospective multicenter studies to standardize protocols and validate clinical utility.