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Persistent polyclonal binucleated B-cell lymphocytosis and MECOM gene amplification.

Edouard Cornet1,2, Hossein Mossafa3, Karine Courel4

  • 1Laboratory of Hematology, Caen University Hospital, Caen, 14000, France. cornet-e@chu-caen.fr.

BMC Research Notes
|March 4, 2016
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Summary

Persistent Polyclonal Binucleated B-cell Lymphocytosis (PPBL) is linked to isochromosome 3q, particularly MECOM gene abnormalities. This finding suggests a key role for chromosome 3q in PPBL development and potential malignancy risk.

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Area of Science:

  • Hematology
  • Cytogenetics
  • Oncology

Background:

  • Persistent Polyclonal Binucleated B-cell Lymphocytosis (PPBL) is a chronic condition with distinct B-cell and cytogenetic features.
  • Key cytogenetic findings include a supernumerary isochromosome +i(3)(q10), premature chromosome condensation, and chromosomal instability.
  • While often benign, PPBL carries a risk of subsequent malignancies.

Purpose of the Study:

  • To update the clinical and cytogenetic characteristics of a large PPBL patient cohort.
  • To document subsequent malignancies in PPBL patients during follow-up.
  • To investigate the specific role of the long arm of chromosome 3 in PPBL pathogenesis.

Main Methods:

  • Analysis of clinical, biological, and cytogenetic data from 150 PPBL patients.
  • Conventional cytogenetic analysis and fluorescent in situ hybridization (FISH).
  • High-resolution SNP arrays performed on 10 PPBL patients (CD19(+) vs. CD19(-) cells).

Main Results:

  • Isochromosome +i(3)(q10) found in 59% and chromosomal instability in 55% of patients.
  • Recurrent copy number aberrations on 3q, including 129 gains (90%) in CD19(+) B-cells, with a common amplified region in the MECOM gene.
  • 12% of patients developed subsequent malignancies (6 solid tumors, 6 Non-Hodgkin's Lymphomas) and 6 MGUS cases after a median 60-month follow-up.

Conclusions:

  • Isochromosome 3q, particularly MECOM gene abnormalities, is hypothesized to play a key role in PPBL.
  • The findings underscore the need for long-term clinical follow-up for PPBL patients.
  • Further research into the 3q abnormalities could elucidate PPBL mechanisms and malignancy risk.