Analysis of microsatellite instability and loss of heterozygosity in keratoacanthoma

Ketty Peris, Fabio Magrini, Gisela Keller, Liborio Manente, Elvira D'Alessandro, Maria Teresa Onorati, Heinz Höfler, Sergio Chimenti

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21 Scopus citations

Abstract

We analyzed microsatellite instability (MSI) and loss of heterozygosity (LOH) at 17 microsatellite markers located on chromosomes 2p, 3p, 5q, 6q, 9p, 9q, 17p and 18q in 19 randomly selected keratoacantomas (KAs), in one cutaneous lesion that histologically could not unequivocally be differentiated from squamous cell carcinoma, and in one patient with multiple KAs of longstanding duration. The goals of our study were to determine whether, in a similar manner to some visceral carcinomas, genomic instability could be detected in KAs and to clarify whether molecular analysis might be useful to further characterize KA. MSI was observed in 2 of 21 cases (9.5%) at 5 of 17 loci examined. In one patient with a solitary KA, the presence of MSI and a family history of visceral malignant tumours suggested that the patient might have belonged to a family with Muir-Torre syndrome. In one other MSI+ KA, a definite differential diagnosis in relation to squamous cell carcinoma could not be established. In addition, one sample displayed LOH at 2 of 17 loci analysed whereas in the patient with multiple KAs, LOH at one locus was the only alteration found. In conclusion, the low frequency of MSI and LOH detected in our study suggests that these genetic events are uncommon in KA unless it is associated with a familial disease (e.g. Muir-Torre syndrome) or it has more aggressive histological features.

Original languageEnglish
Pages (from-to)185-188
Number of pages4
JournalArchives of Dermatological Research
Volume289
Issue number4
DOIs
StatePublished - 1997

Keywords

  • Keratoacanthoma
  • Loss of heterozygosity
  • Microsatellite instability

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