Abstract
Early diagnosis of primary central nervous system lymphoma (PCNSL) represents a challenge, and cerebrospinal fluid (CSF) cytokines may be diagnostic biomarkers for PCNSL. We used an electrochemiluminescence immunoassay to measure interleukin (IL)-10, IL-6, IL-8 and tumor necrosis factor α (TNF-α) in the CSF of 22 B cell PCNSL patients and 80 patients with other CNS diseases. CSF IL-10 was significantly higher in PCNSL patients than in the control group (median 74.7 pg/ml vs < 5.0 pg/ml, P < 0.000). Using a CSF IL-10 cutoff value of 8.2 pg/ml, the diagnostic sensitivity and specificity were 95.5% and 96.1%, respectively (AUC, 0.957; 95% CI, 0.901–1.000). For a CSF IL-10/IL-6 cutoff value of 0.72, the sensitivity was 95.5%, and the specificity was 100.0% (AUC, 0.976; 95% CI, 0.929–1.000). An increased CSF IL-10 level at diagnosis and post-treatment was associated with poor Progression free survival (PFS) for patients with PCNSL (P = 0.0181 and P = 0.0002, respectively). A low diagnostic value for PCNSL was found with CSF IL-8 or TNF-α. In conclusion, increased CSF IL-10 was a reliable diagnostic biomarker for large B cell PCNSL, and an IL-10/IL-6 ratio facilitates differentiation from other conditions, especially a CNS infection.
Highlights
In this study, we recruited control patients with a diagnosis other than primary central nervous system lymphoma (PCNSL) to explore the diagnostic ability of cerebrospinal fluid (CSF) IL-10 and IL-10/IL-6 to identify PCNSL
We identified 22 consecutive B cell PCNSL patients (21 cases of pathologically confirmed diffuse large B-cell lymphoma and one case with CSF confirmed to have a mature B-cell origin by flow cytometry), and all patients were Chinese (Tables 1 and 2)
We demonstrated that elevated CSF IL-10 and CSF IL-10/IL-6 have high sensitivity and specificity for diagnosing large B cell PCNSL via electrochemiluminescence immunoassay (ECLIA)
Summary
We recruited control patients with a diagnosis other than PCNSL to explore the diagnostic ability of CSF IL-10 and IL-10/IL-6 to identify PCNSL. A standardized laboratory method with good performance, i.e., the electrochemiluminescence immunoassay (ECLIA), was used to determine the cytokine levels. Studies suggest that increased serum IL-8 and tumor necrosis factor α(TNF-α) levels are correlated with poor prognosis in systemic DLBCL16–18. We assessed the diagnostic value of CSF IL-8 and TNF-αin PCNSL patients.
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