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Methylation status of HPV16 E2‐binding sites classifies subtypes of HPV‐associated oropharyngeal cancers

The human papillomavirus (HPV) E2 protein is a transcriptional repressor of the oncogenes E6/E7 and loss of E2 function is considered a key step in carcinogenesis. Integration of HPV into the host genome may disrupt the E2 gene. Furthermore, methylation of CpG dinucleotides in E2‐binding sites (E2BSs) in the HPV upstream regulatory region may interfere with transcriptional repression of E6 and E7 by E2. The authors hypothesized that the CpG methylation status of E2BS identifies subtypes of HPV type 16 (HPV16)‐associated oropharyngeal squamous cell cancers (OPSCC) in association with E2 gene integrity and viral integration.