Serum interleukin-6 levels correlate with prognosis in diffuse large-cell lymphoma.

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Abstract
PURPOSEInterleukin-6 (IL-6) is a potent immunomodulatory cytokine that may have pathogenetic and prognostic significance in a number of disorders. The objective of this study was to examine the correlation between serum IL-6 levels and phenotypic characteristics, as well as outcome of patients with diffuse large-cell lymphoma (DLCL).PATIENTS AND METHODSUsing an enzyme-linked immunosorbent assay (ELISA; lower limit of sensitivity, 0.35 pg/mL), we measured IL-6 levels in frozen sera from 33 healthy controls and 58 untreated patients with DLCL who were enrolled onto a single combination chemotherapy protocol. Serum IL-6 levels were correlated with clinical and laboratory features at diagnosis and with failure-free and overall survival.RESULTSSerum IL-6 levels in the lymphoma patients (median, 4.37 pg/mL; range, < 0.35 to 110 pg/mL) were significantly higher than in the control group (median, < 0.35 pg/mL; range, < 0.35 to 1.87 pg/mL) (P < .0001). Serum IL-6 levels were higher in patients with B symptoms (P =...

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