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No VH Somatic Hypermutation Was Detected in B-Cells of a Patient with Macroglobulinemia Due to Splenic Marginal Zone Lymphoma

Abstract

B-cell diseases are classified on the basis of the normal differentiation stages. We report here a case of a patient with a long history of leukocytosis, splenomegaly without lymphadenopathy, and hyperviscosity symptoms. Clinically, the patient’s diagnosis was leukemic Waldenström macroglobulinemia. Chromosomal analysis revealed translocation t(2;7)(p11;q22) along with disease progression. Death occurred from pulmonary infection at 46 months after the initial presentation. At autopsy, malignant lymphocytes were found in the marginal areas of the spleen with spreading to the bone marrow and the liver. The histologic findings were consistent with splenic marginal zone lymphoma. We examined the sequences of the immunoglobulin VH gene in cells from the initial peripheral blood and from the spleen at autopsy and found that the sequences were identical and had no somatic hypermutation. Macroglobulinemia can occur in various B-cell disorders, including splenic marginal zone lymphoma, even with the transformation of unmutated B-lymphocytes. Int J Hematol. 2002;76:453-459.

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Correspondence to Tetsuaki Sekikawa or Shinobu Takahara or Takeshi Kawano or Shuji Nakada or Kiyoshi Ito or Satsuki Iwase or Hisashi Yamada or Masayuki Kobayashi or Junko Horiguchi-Yamada.

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Sekikawa, T., Takahara, S., Kawano, T. et al. No VH Somatic Hypermutation Was Detected in B-Cells of a Patient with Macroglobulinemia Due to Splenic Marginal Zone Lymphoma. Int J Hematol 76, 453–459 (2002). https://doi.org/10.1007/BF02982811

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Key words

  • SMZL
  • WM
  • Macroglobulinemia
  • Somatic hypermutation
  • Naive B-cell