Discordant bone marrow (BM) involvement in diffuse large B-Cell lymphoma (DLBCL) is characterized by marrow infiltrates predominantly composed of small lymphoid cell infiltrates, cytologically compatible with low-grade non-Hodgkin's lymphoma. As a first step in this study the frequency of this phenomenon was investigated. As a second step the clonal relationship of the retrieved cases was investigated by using immunoglobulin heavy chain gene (IgH), as well as Bcl-2 rearrangements, as molecular markers for a comparative analysis of the microdissected BM infiltrates and the primary tumor site (e. g. lymph node). The molecular results were discussed in the context of immunhistochemistry, flow cytometry and clinical follow-up data. It could be shown that discordant BM infiltrates in DLBCL represent a heterogeneous group of disorders: In two thirds of the cases the two tumor components were clonally related, in one third of the cases they were clonally distinct.
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Discordant bone marrow (BM) involvement in diffuse large B-Cell lymphoma (DLBCL) is characterized by marrow infiltrates predominantly composed of small lymphoid cell infiltrates, cytologically compatible with low-grade non-Hodgkin's lymphoma. As a first step in this study the frequency of this phenomenon was investigated. As a second step the clonal relationship of the retrieved cases was investigated by using immunoglobulin heavy chain gene (IgH), as well as Bcl-2 rearrangements, as molecular m...
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