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We evaluated the prognostic significance of the serum level of the soluble form of interleukin-2 receptorα (sIL-2Rα) and investigated its association with CD25 expression on tumor cells in diffuse large B-cell lymphoma (DLBCL). Three hundred and thirty-eight adult patients with newly diagnosed DLBCL were eligible for this retrospective study. 32.2% of patients were treated with CHOP-like regimen and 67.8% with R-CHOP-like regimen. CD25 expression on the surface of tumor cells was evaluated in 143 cases and its relationship with sIL-2Rα level was also investigated. Both overall survival (OS) and progression-free survival (PFS) were poorer in patients with higher sIL-2Rα, in both R-CHOP and CHOP groups. sIL-2Rα &gt; 1,000 U/mL and performance status (PS) ≥ 2 were independently associated with poorer OS, and sIL-2Rα &gt; 1,000 U/mL, age &gt; 60 years, and ≥ 2 extranodal sites were independently associated with poorer PFS in the R-CHOP group. The sIL-2Rα level was higher in the CD25-positive group than in the CD25-negative group in stage 3 or 4 disease (p = 0.010). Multiple linear regression analysis showed CD25 expression to be independently correlated with sIL-2Rα levels. High sIL-2Rα is an important risk factor for survival in DLBCL treated with not only CHOP-like, but also R-CHOP-like regimens, regardless of the tumor's expression of CD25.

journal of clinical and experimental hematopathology

Prognostic Importance of the Soluble Form of IL-2 Receptor^|^alpha; (sIL-2R^|^alpha;) and its Relationship with Surface Expression of IL-2R^|^alpha; (CD25) of Lymphoma Cells in Diffuse Large B-cell Lymphoma Treated with CHOP-like Regimen with or without Rituximab : A Retrospective Analysis of 338 Cases