Gnathic and peripheral ameloblastomas lack human papillomavirus DNA

Area of Science:

• Oncology
• Virology
• Pathology

Background:

• Human papillomavirus (HPV) is linked to head and neck cancers, including squamous cell carcinomas and Schneiderian papillomas.
• Ameloblastomas, tumors of the jawbones or soft tissues, can present with sinonasal involvement, sharing features with Schneiderian papillomas.
• Previous studies, primarily from the 1990s using PCR, suggested a possible HPV association with gnathic ameloblastomas, but evidence remains limited.

Purpose of the Study:

• To investigate the presence of low- and high-risk human papillomavirus (HPV) DNA in both gnathic and peripheral ameloblastomas.
• To clarify the role of HPV in the pathogenesis of sinonasal ameloblastomas.
• To update previous findings using modern techniques and a broader sample of ameloblastoma types.

Main Methods:

• In situ hybridization was employed to detect HPV DNA in 29 archival cases of gnathic osseous and peripheral head and neck ameloblastomas.
• Tumor samples were sourced from the University of Virginia and Johns Hopkins Hospital archives.
• The study specifically aimed to differentiate between high-risk and low-risk HPV subtypes.

Main Results:

• No high-risk HPV DNA was detected in any of the 29 analyzed ameloblastoma samples.
• Low-risk HPV DNA was identified in only one peripheral ameloblastoma case, occurring in an immunocompromised patient.
• The detected low-risk HPV in the single case is considered a likely incidental "passenger" infection rather than a causative agent.

Conclusions:

• Human papillomavirus (HPV), encompassing both high- and low-risk subtypes, is unlikely to be a significant factor in the development of sinonasal ameloblastomas.
• The findings challenge previous limited reports and suggest HPV does not play a primary role in the pathogenesis of these tumors.
• Further research may focus on other etiological factors for ameloblastoma development.