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Microsatellite analysis in cutaneous malignant melanoma.

D Massi1, I Sardi, C Urso

  • 1Department of Human Pathology and Oncology, Medical Genetics Unit, University of Florence, Italy.

Melanoma Research
|December 3, 2002
PubMed
Summary

Microsatellite alterations occur in sporadic cutaneous melanoma, though less frequently than mismatch repair defects. Genetic changes in metastatic melanoma can evolve from primary tumor alterations.

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Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • The role of microsatellite alterations in sporadic cutaneous melanoma remains unclear.
  • Understanding these genetic events is crucial for elucidating melanoma pathogenesis.

Purpose of the Study:

  • To investigate the presence and significance of microsatellite alterations in primary and metastatic cutaneous melanoma.
  • To identify potential genetic events driving melanoma development.

Main Methods:

  • Analysis of tumor samples from 21 melanoma patients, including primary tumors, sentinel lymph nodes, and metastases.
  • Laser-assisted microdissection to isolate neoplastic cells.
  • Polymerase chain reaction (PCR) using 11 microsatellite markers across specific chromosomal locations (2p, 4q, 9p, 16q, 17p, 21q).

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Main Results:

  • Microsatellite alterations were detected in 23.8% (5 out of 21) of melanomas.
  • Specific alterations were identified at markers D2S2182, D17S261, D2S2291, and D9S171.
  • One case showed identical alterations in the primary tumor and sentinel lymph node metastasis.
  • Metastatic lesions exhibited similar alterations to the primary tumor, with additional changes observed in one case.

Conclusions:

  • Cutaneous melanomas exhibit microsatellite alterations, but at a lower frequency than specific mismatch repair defects.
  • Metastatic lesions often share microsatellite alterations with primary tumors.
  • Further genetic changes can occur during melanoma progression and metastasis.