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Comparison and correlation between sPD-L1 in the serum and matched CSF of glioma patients. (A) sPD-L1 measurements in CSF and matched serum samples collected from 31 patients. (B) Correlation between serum and CSF sPD-L1 levels in individual patients with gliomas (n = 31). Pearson's correlation coefficients (R) and P-values are shown. Statistical significance was defined as *p < 0.05.
