Squamous Cell Cancer of the Head and Neck

This is a phase 1, open-label, single-center study that plans to enroll 40 participants who will undergo surgical resection as SOC for HNSCC. This trial is designed to evaluate the safety of the safety of fluorescently labeled nivolumab (nivo800) as a molecular imaging agent. The study employs a dose-escalation design across four cohorts of 10 participants each. Participants in Cohorts 1-3 will receive an infusion of nivo followed by an infusion of nivo800 prior to standard-of-care surgical resection. The administration of unlabeled nivo will be administered approximately 2-3 weeks before surgery, followed by an administration of nivo800 administered 1-2 days prior to surgery.