Tissue microarray evidence of association between p16 and phosphorylated eIF4E in tonsillar squamous cell carcinoma. Academic Article uri icon

Overview

abstract

  • BACKGROUND: Expression of p16 is a marker for human papillomavirus (HPV)-related carcinogenesis in head and neck cancer. The purpose of this study is to determine if p16 immunoreactivity is associated with aberrant expression of components of the PI3 kinase pathway. METHODS: A tissue microarray (TMA) was constructed for 46 archived tonsillar squamous cell carcinoma specimens. Clinical demographics of these patients were analyzed, and the TMA was interrogated with antibodies directed against p16, phosphorylated Akt(Ser473), phosphorylated S6(Ser240/244), phosphorylated S6(Ser235/236), phosphorylated 4E-BP1(Thr37/46), phosphorylated eIF4E(Ser209), PTEN, p21, and p53. RESULTS: There was a significant correlation between history of tobacco abuse (>10 pack/years) and absence of p16 expression (p = .01). Expression of p16 was significantly associated with immunoreactivity of p21 (p = .02), PTEN (p = .02), and phosphorylated eIF4E (p = .03). There was no evidence of association between p16 status and expression of phosphorylated S6, phosphorylated 4E-BP1, or p53. CONCLUSION: p16 positive tonsillar squamous cell carcinoma is characterized by expression of phosphorylated eIF4E that may occur via a mammalian target of rapamycin (mTOR)-independent mechanism.

publication date

  • November 10, 2010

Research

keywords

  • Carcinoma, Squamous Cell
  • Eukaryotic Initiation Factor-4E
  • Neoplasm Proteins
  • Tonsillar Neoplasms

Identity

Scopus Document Identifier

  • 80051764841

Digital Object Identifier (DOI)

  • 10.1002/hed.21621

PubMed ID

  • 21837706

Additional Document Info

volume

  • 33

issue

  • 9