Matching Primary Tumor and Blood Gene Expression Analysis of HPV-negative Squamous Head and Neck Cancers

The goal of this observational study is to learn whether a blood test can show the same biological features as the tumor in people with head and neck cancer that is not caused by HPV. These cancers often have different biological types, and these types may help predict how the cancer will behave. Today, these types can only be found by studying tumor tissue. This study wants to see if a simple blood sample can give the same information. The main questions the study aims to answer are: * Can a blood test identify the same tumor type that researchers find by studying tumor tissue under a microscope and through genetic testing? * Can these blood test results help predict how people may do after finishing treatment? Researchers will not assign treatments. All participants will receive the treatments recommended by their own care team as part of routine care. Participants will: * Give a