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Blood, 1 November 2002, Vol. 100, No. 9, pp. 3419-3422
BRIEF REPORT
Chronic lymphocytic leukemia preceded by cold agglutinin
disease: intraclonal immunoglobulin light-chain diversity in
VH4-34 expressing single leukemic
B cells
Sarka Ruzickova,
Axel Pruss,
Marcus Odendahl,
Karsten Wolbart,
Gerd-Rüdiger Burmester,
Jürgen Scholze,
Thomas Dörner, and
Arne Hansen
From Deutsches Rheumaforschungszentrum, Berlin;
Department of Transfusion Medicine/Outpatients Department and
Department of Rheumatology and Clinical Immunology, Charité
University Hospital, Berlin, Germany.
Autoimmune phenomena may precede or accompany lymphoid
malignancies, especially B-chronic lymphocytic leukemia (B-CLL). We report a patient with a 7-year history of primary (idiopathic) cold
agglutinin (CA) disease in whom B-CLL subsequently developed. Immunophenotyping and single-cell reverse transcription-polymerase chain reaction (RT-PCR) were applied to investigate the origin and
diversification of leukemic B cells. The obtained data indicate a
memory cell-type origin of the B-CLL cells. Remarkably, the IgV genes of the
B-CLL cells showed intraclonal diversity, whereas the mutational
pattern of their paired IgVH genes were invariant. Thus, the light-chain-restricted intraclonal diversity in
individual leukemic B cells in this patient strongly indicates a
differential regulation or selection of the ongoing mutational process.
Of note, our findings suggest that this B-CLL had developed from the
patient's CA-producing B-cell population.

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