CSF neopterin level as a diagnostic marker in primary central nervous system lymphoma
Viaccoz, Aurélien ; Ducray, François ; Tholance, Yannick ; Barcelos, Gleicy Keli ; Thomas-Maisonneuve, Laure ; Ghesquières, Hervé ; Meyronet, David ; Quadrio, Isabelle ; Cartalat-Carel, Stéphanie ; Louis-Tisserand, Guy ; Jouanneau, Emmanuel ; Guyotat, Jacques ; Honnorat, Jérôme ; Perret-Liaudet, Armand
In: Neuro-Oncology, 2015, vol. 17, no. 11, p. 1497-1503
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- Background The diagnosis of primary central nervous system lymphoma (PCNSL) can be challenging. PCNSL lesions are frequently located deep within the brain, and performing a cerebral biopsy is not always feasible. The aim of this study was to investigate the diagnostic value of CSF neopterin, a marker of neuroinflammation, in immunocompetent patients with suspected PCNSL. Methods We retrospectively reviewed the characteristics of 124 patients with brain tumor (n = 82) or an inflammatory CNS disorder (n = 42) in whom CSF neopterin levels were assessed. Twenty-eight patients had PCNSL, 54 patients had another type of brain tumor (glioma n = 36, metastasis n = 13, other n = 5), and 13 patients had a pseudotumoral inflammatory brain lesion. Results CSF neopterin levels were significantly higher in the patients with PCNSL than in those with other brain tumors (41.8 vs 5.1 nmol/L, P < .001), those with pseudotumoral inflammatory brain lesions (41.8 vs 4.3 nmol/L, P < .001), and those with nontumefactive inflammatory CNS disorders (41.8 vs 3.8 nmol/L, P < .001). In the 95 patients with space-occupying brain lesions, at a cutoff of 10 nmol/L, the sensitivity of this approach was 96% and the specificity was 93% for the diagnosis of PCNSL. The positive and negative predictive values were 84% and 98%, respectively. Conclusion Assessing CSF neopterin levels in patients with a suspected brain tumor might be helpful for the positive and differential diagnosis of PCNSL. A prospective study is warranted to confirm these results