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Updated: May 25, 2026

Cell Population Analyses During Skin Carcinogenesis
06:53

Cell Population Analyses During Skin Carcinogenesis

Published on: August 21, 2013

Examination of Smad2 and Smad4 copy-number variations in skin cancers

Yong Shao1, Jie Zhang, Richu Zhang

  • 1Shenzhen Key Lab for Translational Medicine of Dermatology, Shenzhen-PKU-HKUST Medical Center, Shenzhen, Guangdong 518036, China.

Clinical & Translational Oncology : Official Publication of the Federation of Spanish Oncology Societies and of the National Cancer Institute of Mexico
|February 4, 2012
PubMed
Abstract

Insights

Copy number variations (CNVs) in Smad2 are linked to basal cell carcinoma (BCC) and squamous cell carcinoma (SCC). Smad4 CNVs are associated with SCC severity, highlighting their role in skin cancer development.

Area of Science:

  • Genetics
  • Oncology
  • Dermatology

Background:

  • Smad2 and Smad4 are key mediators of the transforming growth factor beta (TGF-β) pathway.
  • Copy number variations (CNVs) are linked to cancer pathogenesis.
  • Previous studies identified CNVs of Smad2 and Smad4 in various cancers, but not specifically in skin cancer.

Purpose of the Study:

  • To investigate the presence and association of Smad2 and Smad4 copy number variations (CNVs) in skin cancer.
  • To determine if Smad2 and Smad4 CNVs correlate with the severity of skin abnormalities.

Main Methods:

  • Analysis of 195 paired skin samples, including basal cell carcinoma (BCC), squamous cell carcinoma (SCC), and actinic keratosis (AK).
  • Real-time polymerase chain reaction (PCR) was employed to quantify Smad2 and Smad4 copy numbers.

Main Results:

  • Statistically significant differences in Smad2 CNVs were observed between cancerous (SCC and BCC) and normal skin tissues (p<0.05).
  • Smad4 CNVs showed a statistical difference only in SCC samples (p=0.014), not in BCC or AK.
  • CNV frequencies for both Smad2 and Smad4 correlated with the severity of skin abnormalities (p=0.002 for Smad2, p=0.029 for Smad4).

Conclusions:

  • Smad2 copy number variations are associated with both SCC and BCC.
  • Smad4 copy number variations are linked to SCC but not to BCC or AK.
  • These findings suggest Smad2 and Smad4 CNVs play a role in skin cancer development and progression.

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