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Loss of retinoic acid receptor-beta expression is an early event during esophageal carcinogenesis

H Qiu1, W Zhang, A K El-Naggar

  • 1Departments of Clinical Cancer Prevention, Thoracic/Head and Neck Medical Oncology, University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA.

The American Journal of Pathology
|November 7, 1999
PubMed

Insights

Loss of retinoic acid receptor beta (RAR-beta) expression is linked to esophageal cancer development. This early event impacts carcinogenesis and squamous differentiation in esophageal tissues.

Area of Science:

  • Oncology
  • Molecular Biology
  • Gastroenterology

Background:

  • Retinoic acid (RA) inhibits esophageal cancer cell growth.
  • This inhibition correlates with retinoic acid receptor beta (RAR-beta) expression.
  • RAR-beta expression is crucial for RA sensitivity in esophageal cancer cells.

Purpose of the Study:

  • To investigate the in vivo expression of RAR-beta mRNA in normal, dysplastic, and cancerous esophageal tissues.
  • To determine the association between RAR-beta expression and esophageal carcinogenesis.
  • To explore the relationship between RAR-beta expression and the degree of squamous differentiation.

Main Methods:

  • In situ hybridization was used to analyze RAR-beta mRNA expression.
  • Esophageal tissue specimens included normal mucosa, dysplastic lesions, and esophageal tumors (squamous cell carcinomas).
  • Expression levels were correlated with clinicopathological features, including differentiation status.

Main Results:

  • RAR-beta mRNA was detected in 88% of normal esophageal tissues and 96% of adjacent normal mucosa.
  • Expression was significantly lower in dysplastic lesions (57%) and carcinomas (54%).
  • RAR-beta expression decreased with poor squamous cell carcinoma differentiation (29% in poorly differentiated vs. 62% in well-differentiated).

Conclusions:

  • Loss of RAR-beta expression is an early event in esophageal carcinogenesis.
  • Reduced RAR-beta expression is associated with decreased squamous differentiation in esophageal tumors.
  • RAR-beta may serve as a biomarker for esophageal cancer progression.

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