Interestingly, the correlation between CHIT1 and YKL‐40 in untreated patients at baseline just failed to reach significance, despite the fact that both are expressed by glial cells that are known to play a role in neuroinflammation in SMA. 3 However, this could simply be due to the sample size of the study.
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Biochemical and clinical biomarkers in adult SMA 3-4 patients treated with nusinersen for 22 months.
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YKL‐40 concentrations in CSF showed a decreasing trend during treatment with nusinersen but this was not significant ( p = 0.275; Fig. 1B ).