This study is exploring the use of Panitumumab in Head and Neck Cancer. Panitumumab is an approved drug named Vectibix and is used as an anti-cancer agent in other cancers such as colorectal cancer. It works by attaching to the cancer cell in a unique way that allows the drug to get into the cancer tissue. In addition to the Panitumumab, participants will also receive a Panitumumab-IRDye800 (Pan800) or a fluorescently labeled Panitumumab infusion. IRDye800 is an investigational dye that, when tested in the lab, helps various characteristics of human tissue show up better when using a special camera during surgery. Panitumumab-IRDye800 is a combination of the drug and the dye that attaches to cancer cells and appears to make them visible to the doctor when he or she uses the special camera during surgery.

The goal of this study is to use a novel and possibly safer approach to identify an optimal dose for panitumumab to treat cancer patients by using a new light-based therapy. In this study, different drug levels will be analyzed using this approach to understand how much drug reaches the tumor at different administered doses, which may help us provide safer and/or more effective therapies in the future.

The goal is to identify the correct amount or dose of a drug that is needed for effective cancer therapies. Often, clinical studies look at how much of the drug can be tolerated before patients become sick, rather than how much of the drug is required to be effective.

IRDye800 is an investigational dye that, when tested in the lab, helps various characteristics of human tissue show up better when using a special camera during surgery. Panitumumab-IRDye800 is a combination of the drug and the dye that attaches to cancer cells and appears to make them visible to the doctor when he or she uses the special camera during surgery. This will help the surgeon with clinical margins during surgery and will may have a clearer way to differentiate between cancer and healthy tissue.

The goal of this phase I clinical trial is to evaluate the usefulness of an imaging test (zirconium Zr89 panitumumab \[89Zr panitumumab\]) with positron emission tomography (PET)/computed tomography (CT) for diagnosing the spread of disease from where it first started (primary site) to other places in the body (metastasis) in patients with head and neck squamous cell carcinoma. Traditional PET/CT has a low positive predictive value for diagnosing metastatic disease in head and neck cancer. 89Zr panitumumab is an investigational imaging agent that contains radiolabeled anti-EGFR antibody which is overexpressed in head and neck cancer. The main question this study aims to answer is the sensitivity and specificity of 89Zr panitumumab for the detection of indeterminate metastatic lesions in head and neck cancer.

Participants will receive 89Zr panitumumab infusion and undergo 89Zr panitumumab PET/CT 1 to 5 days after infusion. Participants will otherwise receive standard of care evaluation and treatment for their indeterminate lesions.

Researchers will compare the 89Zr panitumumab to standard of care imaging modalities (magnetic resonance imaging (MRI), CT, and/or PET/CT).

The purpose of this study is to determine if panitumumab-IRDye800 is effective in identifying cancer, compared to surrounding normal tissue, and the further characterize the safety profile of this drug.