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pubmed-article:16879773pubmed:abstractTextIn this study, we used IGH sequence analysis to assess the maturational status of Waldenstrom's (WM) macroglobulinemia and its putative precursor immunoglobulin (Ig)-M monoclonal gammopathy of undetermined significance (MGUS). IGH sequence analysis was performed using standard methods in 23 cases (20 WM and 3 IgM MGUS as defined by consensus panel criteria). Waldenstrom's macroglobulinemia cases were characterized by heavily mutated IGH genes (median, 6.3%; range, 3.8%-13.9%) but without intraclonal variation (ICV). IgM MGUS was similarly characterized by somatic hypermutation (median, 7.5%; range, 7%-7.7%), but ICV was evident in 1 of the 3 cases. We would therefore conclude that WM is characterized by somatic hypermutation without ICV, which supports a derivation from postgerminal center/memory B cells. IgM MGUS is also characterized by somatic hypermutation but, in a manner similar to IgA/IgG MGUS, can be associated with ICV, although the significance of this remains unclear.lld:pubmed
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pubmed-article:16879773pubmed:articleTitleImmunoglobulin heavy chain sequence analysis in Waldenstrom's macroglobulinemia and immunoglobulin M monoclonal gammopathy of undetermined significance.lld:pubmed
pubmed-article:16879773pubmed:affiliationHMDS Laboratory, Leeds Teaching Hospitals NHS Trust, Leeds, UK.lld:pubmed
pubmed-article:16879773pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:16879773pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed