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P53 mutations in Ewing's sarcoma.

Y K Park1, S G Chi, Y W Kim

  • 1Department of Pathology, Kyung Hee University Hospital, Dongdaemoon-gu, Seoul 130-702, Korea. ykpark@khmc.or.kr

Oncology Reports
|April 11, 2001
PubMed
Summary
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Genetic alterations in the p53 tumor suppressor gene were investigated in Ewing's sarcoma. P53 gene mutations and deletions were identified in a small fraction of these rare pediatric tumors.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • The p53 tumor suppressor gene is crucial in preventing cancer and is frequently altered in human malignancies.
  • Understanding p53 alterations in rare pediatric cancers like Ewing's sarcoma is vital for therapeutic strategies.

Purpose of the Study:

  • To investigate the frequency and nature of p53 gene alterations, including deletions and mutations, in Ewing's sarcoma.
  • To assess the amplification of MDM2, a known inhibitor of p53, in these tumors.

Main Methods:

  • Analysis of 35 Ewing's sarcoma tissue specimens.
  • Quantitative genomic PCR for p53 deletion analysis.
  • PCR-Single Strand Conformation Polymorphism (PCR-SSCP) and DNA sequencing for p53 mutational analysis.
  • Analysis of MDM2 gene amplification.

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Main Results:

  • Homozygous deletion of the p53 gene was observed in 2 out of 35 tumors.
  • Sequence alterations, including missense point mutations in exons 5 and 8, were found in 3 out of 35 tumors.
  • No abnormal amplification of the MDM2 gene was detected in the analyzed specimens.

Conclusions:

  • Genetic alterations of the p53 gene occur in a small subset of Ewing's sarcoma.
  • These findings contribute to the understanding of the molecular pathogenesis of Ewing's sarcoma.