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RUNX1 amplification in AML with myelodysplasia-related changes and ring 21 chromosomes.

S Burillo-Sanz1, M T Vargas2, R M Morales-Camacho2

  • 1Servicio de Inmunología, Hospital Universitario Virgen del Rocío, Seville, Spain.

Hematological Oncology
|March 8, 2016
PubMed
Summary

A rare ring chromosome 21 abnormality in a patient led to acute myeloid leukemia. This case highlights potential alternative gene targets beyond RUNX1 in leukemia development.

Keywords:
AMLRUNX1 amplificationr(21)

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Area of Science:

  • Genetics
  • Oncology
  • Clinical Medicine

Background:

  • Ring chromosome 21 (r(21)) is a rare structural abnormality associated with potential RUNX1 gene amplification.
  • Constitutional r(21) can result in partial monosomy and trisomy 21, leading to developmental abnormalities.
  • Acute myeloid leukemia (AML) with myelodysplasia-related changes is a serious hematologic malignancy.

Observation:

  • A unique case of a patient with a constitutional r(21) exhibiting dysmorphic features and congenital malformations is presented.
  • The patient developed AML with myelodysplasia-related changes and presented with two r(21) chromosomes, showing RUNX1 amplification.
  • The constitutional r(21) had alterations in tumor suppressor genes and oncogenes, but not RUNX1.

Findings:

  • RUNX1 gene expression was not upregulated at the time of AML diagnosis.
  • The presence of two r(21) chromosomes suggests a complex genetic landscape.
  • Alterations in other genes, besides RUNX1, may contribute to leukemogenesis in this patient.

Implications:

  • This case underscores the complexity of genetic alterations in r(21) associated AML.
  • It suggests that other genes may be amplification targets contributing to leukemia development.
  • Further research is needed to identify these alternative genetic drivers in similar cases.