Abstract
Oral squamous cell carcinomas (OSCCs) develop commonly in cats. While the cause of the feline neoplasms is unknown, a quarter of human OSCCs are caused by papillomavirus (PV) infection. As PV DNA has been previously detected in a feline OSCC, it was hypothesised that PV infection could be a significant cause of feline OSCCs. Human OSCCs that are caused by PVs contain increased p16(CDKN2A) protein (p16), which can be detected using immunohistochemistry. In cats, increased p16 immunoreactivity has been reported within PV-associated skin lesions. This study evaluated p16 immunoreactivity within 30 feline OSCCs. Additionally, PCR was used to amplify PV DNA from the OSCCs. Increased p16 immunoreactivity was present within 2 OSCCs. However, as PV DNA was not amplified from any OSCC in this study, it cannot be confirmed that the increased p16 was caused by PV infection. Therefore, these results do not support the hypothesis that PVs are a significant cause of OSCCs in cats. Loss of p16 expression is considered an important process in the development of human non-PV-induced OSCCs. In contrast, loss of p16 immunoreactivity was only present in 2 feline OSCCs. This suggests that human and feline OSCCs develop due to different molecular me...Continue Reading
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