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Updated: Jul 19, 2026

Cell Population Analyses During Skin Carcinogenesis
06:53

Cell Population Analyses During Skin Carcinogenesis

Published on: August 21, 2013

Epigenetic abnormalities in cutaneous squamous cell carcinomas: frequent inactivation of the RB1/p16 and p53 pathways

K Murao1, Y Kubo, N Ohtani

  • 1Department of Dermatology, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima, Japan.

The British Journal of Dermatology
|October 13, 2006
PubMed
Abstract

Insights

Aberrant promoter hypermethylation of cancer-related genes, particularly CDH1, is common in cutaneous squamous cell carcinomas (SCCs). These epigenetic changes, along with RB1/p16 or p53 pathway dysregulation, contribute to SCC development.

Area of Science:

  • Oncology
  • Epigenetics
  • Molecular Biology

Background:

  • Aberrant methylation of CpG islands in promoter regions of cancer-related genes is observed in various human tumors.
  • The methylation profile in cutaneous squamous cell carcinomas (SCCs) remains understudied.

Purpose of the Study:

  • To investigate epigenetic abnormalities in a broad spectrum of cancer-related genes within SCCs.
  • To correlate gene methylation status with protein production.

Main Methods:

  • Methylation-specific polymerase chain reaction (PCR) was used to analyze the methylation status of 11 candidate cancer-related genes in 20 SCC cases.
  • Immunohistochemical analysis assessed the protein production of key genes including E-cadherin (CDH1), p16, RB1, and p14.

Main Results:

  • High-frequency methylation observed in CDH1 (95%), p16 (20%), p14 (15%), DAPK1 (15%), and MGMT (15%).
  • Promoter hypermethylation correlated with reduced protein production for CDH1, p16, RB1, and p14.
  • Analysis revealed alterations in the RB1/p16 or p53 pathway in 70% of SCCs.

Conclusions:

  • Promoter hypermethylation of cancer-related genes, especially CDH1, is a frequent event in SCCs.
  • Dysregulation of the RB1/p16 and/or p53 pathways, via genetic or epigenetic mechanisms, contributes to SCC carcinogenesis.
  • Epigenetic abnormalities of p53 itself were not implicated in this study's SCC cohort.

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