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Related Experiment Videos

9p21 deletions in primary melanoma

M F Naylor1, S Brown, C Quinlan

  • 1Department of Dermatology, University of Oklahoma Health Sciences Center, USA.

Dermatology Online Journal
|February 27, 1998
PubMed
Summary

Genomic loss on chromosome 9p was detected in 34% of primary melanoma samples. These 9p deletions correlate with increased tumor thickness, suggesting their role in melanoma development.

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Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • Melanoma is a significant skin cancer.
  • Genomic alterations are crucial in cancer development.
  • Chromosome 9 alterations are implicated in various cancers.

Purpose of the Study:

  • To investigate genomic loss on the short arm of chromosome 9 (9p) in primary melanomas.
  • To determine the frequency of 9p deletions in sporadic melanoma.
  • To correlate 9p deletions with clinical parameters like tumor thickness.

Main Methods:

  • Analysis of formalin-fixed, paraffin-embedded primary melanoma biopsies.
  • Use of microsatellite PCR assays for D9S157, D9S161, and D9S171 loci on chromosome 9p.
  • Comparison of paired normal and tumor DNA from the same biopsy specimens.

Main Results:

  • Detectable genomic abnormalities at the studied loci were observed in 15 of 44 (34%) evaluable specimens.
  • Homozygous deletions were found in 8 of 44 (18%) informative specimens.
  • Hemizygous deletions were identified in 11 of 44 (25%) informative specimens.
  • A significant correlation was found between 9p deletions and increased primary tumor thickness (p < 0.05).

Conclusions:

  • Genomic deletions on chromosome 9p are present in a substantial proportion of primary sporadic melanomas.
  • These 9p deletions are associated with a key clinical feature of melanoma progression.
  • The findings support the involvement of 9p21 deletions in melanoma pathogenesis and are not merely an artifact of sample processing.

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