title: FCRL2 mRNA expression is inversely associated with clinical progression in chronic lymphocytic leukemia.
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; P < 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, P < 0.0001; median OS: 321 months vs. not reached, P = 0.009). Univariate comparisons found that FCRL2 expression was weakly associated with IGHV mutation status (P = 0.05), CD38 status (P < 0.0001) and ZAP-70 status (P < 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; P = 0.005). Here we demonstrate that the level of FCRL2 expression is correlated with prognosis in B-CLL.
authors.affiliation: Department of Hematology, University of Duisburg-Essen, Germany. holger.nueckel@uni-due.de
authors.forename: Holger
authors.initials: H
authors.lastname: Nückel
authors.forename: Crista H
authors.initials: CH
authors.lastname: Collins
authors.forename: Ulrich H
authors.initials: UH
authors.lastname: Frey
authors.forename: Ludger
authors.initials: L
authors.lastname: Sellmann
authors.forename: Jan
authors.initials: J
authors.lastname: Dürig
authors.forename: Winfried
authors.initials: W
authors.lastname: Siffert
authors.forename: Ulrich
authors.initials: U
authors.lastname: Dührsen
mesh_terms: D051997:ADP-ribosyl Cyclase 1 / Q000097:blood; D000368:Aged; D018450:Disease Progression; D018572:Disease-Free Survival; D005260:Female; D015973:Gene Expression Regulation, Leukemic; D006402:Hematologic Diseases / Q000097:blood; D006801:Humans; D007143:Immunoglobulin Heavy Chains / Q000235:genetics; D007135:Immunoglobulin Variable Region / Q000235:genetics; D015451:Leukemia, Lymphocytic, Chronic, B-Cell / Q000097:blood* / Q000401:mortality; D007963:Leukocytes, Mononuclear / Q000737:chemistry; D008297:Male; D008562:Membrane Glycoproteins / Q000097:blood; D008875:Middle Aged; D009363:Neoplasm Proteins / Q000096:biosynthesis / Q000097:blood* / Q000235:genetics; D020641:Polymorphism, Single Nucleotide; D011379:Prognosis; D012333:RNA, Messenger / Q000097:blood; D012334:RNA, Neoplasm / Q000097:blood; D012372:ROC Curve; D011956:Receptors, Cell Surface / Q000096:biosynthesis / Q000097:blood* / Q000235:genetics; D012189:Retrospective Studies; D016019:Survival Analysis; D051746:ZAP-70 Protein-Tyrosine Kinase / Q000097:blood
chemical_list: C422179:FCRL2 protein, human; D007143:Immunoglobulin Heavy Chains; D007135:Immunoglobulin Variable Region; D008562:Membrane Glycoproteins; D009363:Neoplasm Proteins; D012333:RNA, Messenger; D012334:RNA, Neoplasm; D011956:Receptors, Cell Surface; D051746:ZAP-70 Protein-Tyrosine Kinase; C497261:ZAP70 protein, human; C498154:CD38 protein, human; D051997:ADP-ribosyl Cyclase 1