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Published on: September 20, 2016

C-terminal nucleophosmin mutations are uncommon in chronic myeloid disorders

Jonathan S C Caudill1, Alexander J Sternberg, Chin-Yang Li

  • 1Division of Hematology, Department of Medicine, Mayo Clinic, Rochester, MN 55905, USA.

British Journal of Haematology
|May 18, 2006
PubMed

Insights

C-terminal nucleophosmin (NPM) mutations are rare in chronic myeloid disorders. However, their presence in chronic myelomonocytic leukaemia (CMML) may indicate an evolving leukaemic clone with poor prognosis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Hematology

Background:

  • C-terminal somatic mutations in nucleophosmin (NPM) are associated with acute myeloid leukaemia (AML).
  • NPM is a nucleolar shuttling protein crucial for binding p53 and p19(Arf).

Purpose of the Study:

  • To investigate the prevalence and significance of NPM1 mutations in chronic myeloid disorders.
  • To determine if NPM1 mutations are associated with specific subtypes or clinical outcomes in these disorders.

Main Methods:

  • Analysis of primary marrow samples from 150 patients with various chronic myeloid disorders.
  • Detection of mutations in the NPM1 gene, specifically focusing on the C-terminal region.

Main Results:

  • NPM1 mutations (tetranucleotide duplication) were identified in three patients with chronic myelomonocytic leukaemia (CMML).
  • These patients exhibited a short survival (<1 year) and rapid progression to overt AML.
  • The majority of patients with other chronic myeloid disorders were NPM1-wild type in the analyzed region.

Conclusions:

  • C-terminal NPM mutations are uncommon in the broader spectrum of chronic myeloid neoplasia.
  • The presence of NPM1 mutations in CMML may signify an evolving leukaemic clone with aggressive behavior and poor prognosis.

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