Association of Plasma Circulating Tumor HPV DNA With HPV-Related Oropharynx Cancer: Study

Oncogenic ctHPVDNA was undetectable in plasma of all 408 participants. Although 20 participants had oncogenic oral ctHPVDNA and 43 were E6 seropositive to an oncogenic type, none of these people had ctHPVDNA detected in their plasma. Paired comparisons of ctHPVDNA in plasma and oral rinse, as well as plasma ctHPVDNA and serum E6 antibodies yielded a κ statistic of 0. This implies agreement of biomarkers was no better than chance alone. In addition, oral ctHPVDNA and E6 antibodies had poor agreement (κ = 0.03), only 3 people had positive results for both.

A good biomarker for a malignant disease should not be detectable in individuals without the disease, a characteristic that makes it specific. Previous specificity estimates for ctHPVDNA in plasma of patients with HPV-OPSCC were discrepant and derived from small groups of controls. This analysis focused on healthy participants enrolled based on eligibility criteria that have been shown to classify them as high-risk for oral HPV infection.

In a large cohort of healthy people without cancer, plasma ctHPVDNA had 100% specificity. This analysis provides clarity for whether detectable ctHPVDNA is present in the plasma of healthy controls without cancer, with or at risk for oral HPV. Moreover, it supports ctHPVDNA in plasma as a potential biomarker in screening or surveillance given better specificity compared with other vali dated OPSCC biomarkers (oral ctHPVDNA and E6 antibodies).

Detection of plasma ctHPVDNA among HPV-OPSCC, including those with localized disease, suggests high positive predictive value, but how long before HPV-OPSCC plasma ctHPVDNA is detectable is unknown and will inform potential screening benefit.

Source: Sakshi R. Tewari, MHS Gypsyamber D'Souza, PhD Tanya Troy, MPH; JAMA Otolaryngology–Head & Neck Surgery doi:10.1001/jamaoto.2022.0159