SURVEILLE-HPV: Evaluation of HPV16 Circulating DNA as Biomarker to Detect the Recurrence, in Order to Improve Post Therapeutic Surveillance of HPV16-driven Oropharyngeal Cancers

SURVEILLE-HPV - A new post therapeutic surveillance strategy for HPV-driven oropharyngeal cancer based on HPV Circulating DNA measures. HPV-positive oropharyngeal cancer patients have a much better prognosis that their HPV-negative counterparts. Despite this, Post Treatment Surveillance (PTS) strategy does not take into account HPV status. HPV Circulating DNA (HPV Ct DNA) has emerged as a promising tool to assess the risk of cancer recurrence following treatment. We assume that this biomarker could be helpful to guide PTS. The number of systematic PTS visits could be significantly reduced in patients with undetectable HPV Ct DNA whereas a closer clinical and radiological follow up could be performed in case of detectable HPV Ct DNA. If confirmed, this new strategy could have several benefits including: * reduction of PTS visits for most HPV-positive patients which implies a potential cost decrease and * Identification of relapse at early stages (before the occurrence of symptoms)