Fluorescence in-situ hybridization and dermoscopy in the assessment of controversial melanocytic tumors

Giovanni Ponti, Cristel Ruini, Daniela Massi, Giovanni Pellacani, Aldo Tomasi, Milena Paglierani, Pietro Loschi, Stefania Seidenari

Research output: Contribution to journalArticlepeer-review

Abstract

Although the 'gold standard' for melanoma diagnosis remains histopathological analysis, presently dermoscopists play a significant role in the diagnostic process. However, even a combined approach may not allow a clear-cut judgment on equivocal melanocytic lesions. Fluorescence in-situ hybridization (FISH) can offer assistance in the evaluation of chromosome abnormalities associated with malignancies, and its role is emerging in melanoma diagnosis. The aim of this study was to evaluate the diagnostic role of the FISH in the assessment of controversial lesions, defined as those lesions showing discrepancies between dermatoscopic and histological evaluations. Twenty clinically and histologically ambiguous melanocytic lesions were selected. After the first histopathologic diagnosis, a second pathologist examined the specimens in a blinded review for a second opinion and to identify the most suitable areas to hybridize using probes specific to RREB1, MYB, and CCND1 genes and the centromere of chromosome 6. The first histopathological evaluation led to the diagnosis of melanoma in seven cases, whereas the second identified eight cases of malignant melanoma and was in agreement with the first in 65% of cases and with dermoscopy in 40% of cases. Cytogenetic abnormalities detected by FISH are markers of malignancy that can be useful in the characterization of difficult-to-diagnose melanocytic tumors, when the dermatologist and the pathologist have a different opinions.

Original languageEnglish
Pages (from-to)474-480
Number of pages7
JournalMelanoma Research
Volume23
Issue number6
DOIs
Publication statusPublished - Dec 2013

Keywords

  • controversial melanocytic tumors
  • fluorescence in-situ hybridization
  • melanoma
  • nevi

ASJC Scopus subject areas

  • Cancer Research
  • Oncology
  • Dermatology

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