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Microsatellite instability in sacral chordoma.

L Klingler1, J Shooks, P N Fiedler

  • 1Department of Orthopaedic Surgery, Vanderbilt University, Nashville, Tennessee 37232-2550, USA.

Journal of Surgical Oncology
|March 1, 2000
PubMed
Summary
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Microsatellite instability (MIN) is detectable in chordomas, a rare bone cancer. Loss of heterozygosity (LOH) may indicate a poorer prognosis than MIN in these tumors.

Area of Science:

  • Oncology
  • Molecular Genetics
  • Cancer Research

Background:

  • Microsatellite instability (MIN) signifies defective DNA mismatch repair in cancer.
  • Chordomas are rare skeletal malignancies with limited known molecular markers.
  • The presence of MIN in chordomas remains largely uninvestigated.

Purpose of the Study:

  • To determine if microsatellite instability (MIN) is present in human chordomas.
  • To investigate the potential association between MIN, loss of heterozygosity (LOH), and clinical outcomes in chordoma patients.

Main Methods:

  • Analysis of sacral chordoma samples from 12 patients.
  • Evaluation for MIN at 9 genetic loci using polymerase chain reaction (PCR).
  • Assessment of loss of heterozygosity (LOH) at various genetic markers.

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Main Results:

  • Fifty percent of chordoma patients (6/12) exhibited MIN at one or more loci.
  • Two patients displayed loss of heterozygosity (LOH).
  • One patient with LOH but no MIN showed aggressive disease progression, including metastasis.

Conclusions:

  • Chordomas exhibit microsatellite instability (MIN), adding them to the spectrum of MIN-positive malignancies.
  • Loss of heterozygosity (LOH) may be a more significant prognostic indicator than MIN in chordomas.
  • Further research is warranted to elucidate the prognostic value of LOH in chordoma.