Field effect in oral precancer as assessed by DNA flow cytometry and array-CGH

Monica Pentenero, Alessandra Donadini, Emanuela di Nallo, Massimo Maffei, Roberto Marino, Ubaldo Familiari, Patrizio Castagnola, Sergio Gandolfo, Walter Giaretti

Research output: Contribution to journalArticle

Abstract

Objective: 'Field cancerization' is an accepted model for oral carcinogenesis. So far, genetically altered fields have been just reported in the presence of carcinomas. This study assessed the distant mirror fields (MFs) of oral precancer by DNA high-resolution flow cytometry (hr DNA-FCM) and array-Comparative Genomic Hybridization (a-CGH). Methods: Five leukoplakias without dysplasia (OLs), seven dysplastic leukoplakias (DOLs), and 12 corresponding visually normal and non-dysplastic MFs were analyzed. DNA aneuploidy (DNA Index, DI≠1) was detected by hr DNA-FCM on DAPI stained nuclei suspensions. The epithelial DNA aneuploid subclones were FCM-sorted to obtain genomic DNA for a-CGH. Results: Mirror fields, OLs, and DOLs showed increasing prevalence of DNA aneuploidy of, respectively, 8%, 20%, and 57%. The average number of chromosome aberrations (Ch-Abs) was 2.8 in MFs, 3 in OLs, and 10.6 in DOLs. MFs relative to OLs and DOLs had average numbers of Ch-Abs, respectively, of 1.8 and 3.6. Ch-Abs were also observed in DNA diploid sublines, and often the same aberrations were observed in both MFs and corresponding OLs/DOLs. Conclusion: DNA aneuploidy and Ch-Abs in MFs, the last ones being mainly gains, indicate an early onset of field effect in oral carcinogenesis.

Original languageEnglish
Pages (from-to)119-123
Number of pages5
JournalJournal of Oral Pathology and Medicine
Volume41
Issue number2
DOIs
Publication statusPublished - Feb 2012

Keywords

  • Field cancerization
  • High-resolution DNA flow cytometry
  • High-resolution oligonucleotide array-comparative genomic hybridization
  • Oral precancer

ASJC Scopus subject areas

  • Cancer Research
  • Pathology and Forensic Medicine
  • Otorhinolaryngology
  • Oral Surgery
  • Periodontics

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    Pentenero, M., Donadini, A., di Nallo, E., Maffei, M., Marino, R., Familiari, U., Castagnola, P., Gandolfo, S., & Giaretti, W. (2012). Field effect in oral precancer as assessed by DNA flow cytometry and array-CGH. Journal of Oral Pathology and Medicine, 41(2), 119-123. https://doi.org/10.1111/j.1600-0714.2011.01085.x