Receiver-operating characteristics curve analyses with RELs of CSF miRNAs for discrimination of patients with PCNSL and control patients. CSF relative expression of miR-21 yielded an AUC of 0.94 (95% CI, 0.886-1.00), for miR-19b an AUC of 0.98 (95% CI, 0.955-1.01), for miR-92a an AUC of 0.97 (95% CI, 0.925-1.01), for miR-15b an AUC of 0.85 (95% CI, 0.748-0.959), for miR-106b an AUC of 0.60 (95% CI, 0.452-0.765), and for miR-204 an AUC of 0.65 (95% CI, 0.497-0.803), respectively.