FCRL2 mRNA expression is inversely associated with clinical progression in chronic lymphocytic leukemia

Authors


Holger Nückel, MD, Department of Hematology, University Hospital Essen, Hufelandstr 55, D-45122 Essen, Germany. Tel: +49 0201 7232417; Fax: +49 0201 7235928; e-mail: holger.nueckel@uni-due.de

Abstract

Fc receptor-like 2 (FCRL2) is highly expressed on B-cell chronic lymphocytic leukemia (B-CLL) cells and could possibly influence disease pathogenesis. Therefore, we investigated FCRL2 mRNA expression in a large cohort with 152 CLL patients in order to assess its role in risk prediction in B-CLL. FCRL2 mRNA expression was found to be expressed at considerably higher levels in peripheral blood mononuclear cells (PBMC) of B-CLL patients compared to controls (range 1.35- to 210-fold upregulation; < 0.0001) and cells of other hematological diseases. Patients with high FCRL2 expression (according to ROC-analysis) had a significantly longer treatment-free survival (TFS) and overall survival (OS) than patients with low FCRL2 expression (median TFS: 119 vs. 34 months, < 0.0001; median OS: 321 months vs. not reached, = 0.009). Univariate comparisons found that FCRL2 expression was weakly associated with IGHV mutation status (= 0.05), CD38 status (< 0.0001) and ZAP-70 status (< 0.0001). Furthermore, we show that the combination of FCRL2 with ZAP70-, CD38- or IGHV-status could further significantly refine the prognostic information provided by either of the factors alone in TFS and OS. In multivariate analysis low FCRL2 expression was a significant independent prognostic factor (HR 2.4; = 0.005). Here we demonstrate that the level of FCRL2 expression is correlated with prognosis in B-CLL.

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