HPV Integration in Head and Neck Cancer: Downstream Splicing Events and Expression Ratios Linked with Poor Outcomes.

Area of Science:

• Oncology
• Virology
• Genomics

Background:

• Human papillomavirus integration (HPVint) is implicated in HPV-associated cancers like head and neck squamous cell carcinomas (HNSCC).
• The precise relationship between HPVint and clinical outcomes in HNSCC remains unclear despite characterization of its impact on human DNA.

Purpose of the Study:

• To investigate the consequences of HPVint on human and HPV gene expression.
• To determine the association between HPVint and clinical outcomes, including recurrence and overall survival in HNSCC.
• To identify potential biomarkers for risk stratification and targeted therapy in HPV-associated HNSCC.

Main Methods:

• Analysis of HPVint events from 261 HNSCC RNA-seq samples and 102 DNA HPVint events across five cohorts.
• Investigation of HPVint's impact on gene expression and clinical outcomes (recurrence, overall survival).
• Stratification of HPVint-positive participants using HPV RNA features like E1* integration and HPV gene expression ratios (HGER).

Main Results:

• Identification of an oncogenic gene network associated with recurrent HPVint locations and gene expression alterations, highlighting NR4A2, CD274, CCER1, CAMK, and KLF families.
• Discovery that spliced HPV-human fusion transcripts (E1* integration) and HPV gene expression ratios (HGER) can stratify patients by risk.
• Demonstration that specific HPV RNA features correlate with worse clinical outcomes in subsets of HPVint-positive HNSCC patients.

Conclusions:

• Focusing on RNA reveals new insights into HPVint's carcinogenic mechanisms, clarifying its association with aggressive phenotypes.
• The study provides potential RNA-based biomarkers (E1* integration, HGER) for advancing precision oncology in HPV-associated HNSCC.
• Newly identified genes with recurrent integration events represent potential targets for novel therapeutic strategies.