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Expression of nitric oxide synthase-2 in cutaneous squamous cell carcinoma of the head and neck

P A Brennan1, T Umar, G I Smith

  • 1Specialist Registrar in Oral and Maxillofacial Surgery, Poole General Hospital, Poole, Dorset, UK.

The British Journal of Oral & Maxillofacial Surgery
|June 11, 2002
PubMed

Insights

Nitric oxide synthase (NOS2) expression is elevated in squamous cell skin carcinoma, potentially explaining its aggressive nature. This contrasts with basal cell carcinoma, where NOS2 is down-regulated.

Area of Science:

  • Oncology
  • Dermatology
  • Molecular Biology

Background:

  • Nitric oxide (NO) plays a key role in angiogenesis.
  • Nitric oxide synthase (NOS2) expression is reduced in basal cell carcinoma.
  • Limited research exists on NOS2 expression in squamous cell carcinoma.

Purpose of the Study:

  • To investigate the expression of NOS2 in head and neck squamous cell carcinoma.
  • To correlate NOS2 expression with clinical parameters like tumor size and differentiation.

Main Methods:

  • Immunohistochemical analysis of 37 head and neck squamous cell carcinoma cases.
  • Assessment of NOS2 localization and intensity in tumor epithelium and epidermis.

Main Results:

  • NOS2 expression was observed in the basal cell layer of the epidermis.
  • A significant increase in NOS2 expression was found in the tumor epithelium.
  • No correlation was identified between NOS2 expression and tumor size or differentiation grade.

Conclusions:

  • Elevated NOS2 expression in squamous cell carcinoma may contribute to its aggressive behavior.
  • Increased NO concentrations in these tumors could be linked to their higher aggressiveness compared to basal cell carcinoma.

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