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Molecular Pathogenesis of Human Papillomavirus Type 16 in Tonsillar Squamous Cell Carcinoma.

Anticancer Research 2015 December
AIM: The present study aimed to explore the etiological role of human papillomavirus (HPV) in tonsillar squamous cell carcinoma (TSCC).

MATERIALS AND METHODS: HPV status, including viral load and E6 variants, and the expression of P53, p16(INK4A), and FANCD2, in tissues of TSCC (n=24) and tonsillitis (n=31) were investigated.

RESULTS: The frequency of high-risk HPV (HPV-16) in TSCCs (42%) was higher than that of tonsillitis (16%). HPV-16 genome was partially or fully integrated in all HPV-16-positive TSCCs. However, the viral genome was partially integrated in three out of five HPV-16-positive tonsillitis cases (p=0.037). HPV-16-positive TSCCs showed a higher frequency of p16(INK4A) expression than HPV-16-negative TSCCs and tonsillitis (p=0.011). Regardless of HPV status, TSCCs had a lower expression of FANCD2 than tonsillitis (p=0.008).

CONCLUSION: The present study supports the etiological role of HPV-16 in the development of TSCC, and p16(INK4A) overexpression can be applied as a surrogate marker for the detection of high-risk-HPV in TSCC.

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