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HH Gerhartz, CR Bartram, A Raghavachar, H Schmetzer, C Clemm, W Wilmanns and E Thiel
Med Klinik III, Klinikum Grosshadern, Munich University, FRG.
Mononuclear cells from a 44-year-old patient with acute myeloid leukemia
(AML) gave rise to a spontaneous permanent cell line cultured in
suspension. The cell line was shown to be positive for Epstein-Barr virus
nuclear antigen (EBNA). As expected, its composite phenotype was of B-cell
type with B-cell antigens (CD 20, CD 21) and with monoclonal surface IgM of
kappa type, but without detectable IgM secretion. Surprisingly, identical
monoclonal rearrangements of the immunoglobulin heavy chain (JH) sequences
could be demonstrated in the uncultured bone marrow AML cells and in the
cell line that also had kappa light chain gene rearrangement. This is the
first case to our knowledge of an EBNA positive B-cell line with identical
monoclonal Ig heavy chain rearrangement as detected in myeloblastic
leukemia cells.
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