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Chronic Lymphocytic Leukemia and Normal B Cells

High expression of lipoprotein lipase in poor risk B-cell chronic lymphocytic leukemia

Abstract

We investigated the pattern of lipoprotein lipase (LPL) expression in B-cell chronic lymphocytic leukemia (B-CLL) and assessed its prognostic relevance. Expression of LPL mRNA as well as protein was highly restricted to leukemic B cells. The intensity of intracellular immunoreactivity of LPL was higher in samples of patients with unmutated immunoglobulin heavy-chain variable region genes (IGVH) compared to those with mutated IGVH genes. LPL mRNA levels in peripheral blood mononuclear cells (PBMNC) from 104 CLL patients differed by 1.5 orders of magnitude between cases with mutated (N=51) or unmutated (N=53) IGVH (median: 1.33 vs 45.22 compared to normal PBMNC). LPL expression correlated strongly with IGVH mutational status (R=0.614; P<0.0001). High LPL expression predicted unmutated IGVH status with an odds ratio of 25.90 (P<0.0001) and discriminated between mutated and unmutated cases in 87 of 104 patients (84%). LPL expression was higher in patients with poor risk cytogenetics. High LPL expression was associated with a shorter treatment-free survival (median 40 vs 96 months, P=0.001) and a trend for a shorter median overall survival (105 months vs not reached). Our data establish LPL as a prognostic marker and suggest functional consequences of LPL overexpression in patients with B-CLL.

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Acknowledgements

We wish to thank Bernd Biermayer, Uli Zeman and Martin Hilgarth for excellent technical assistance and John D Brunzell from the University of Washington, Seattle, who kindly provided the LPL 5D2 Mab. This work was supported by grants from the Austrian National Bank (Grant #9964), the Austrian Human Genome Project (‘GEN-AU’) (UJ, DH), Corixa Co., Seattle (AG), DFG (STI 296/1), Sander (2001.04.01) and Fresenius (CLL4) (DK, AK, HD, SS).

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Correspondence to U Jäger.

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Heintel, D., Kienle, D., Shehata, M. et al. High expression of lipoprotein lipase in poor risk B-cell chronic lymphocytic leukemia. Leukemia 19, 1216–1223 (2005). https://doi.org/10.1038/sj.leu.2403748

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